# Accepted Cycle 16 Observing Proposals

## ALL PROPOSALS

 EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS SN SNR AND ISOLATED NS CLUSTERS OF GALAXIES WD BINARIES AND CV STARS AND WD BH AND NS BINARIES GALACTIC DIFFUSE EMISSION AND SURVEYS NORMAL GALAXIES SOLAR SYSTEM ACTIVE GALAXIES AND QUASARS
Proposal Number Subject Category PI Name Type Time (ks) Title
16100908 SOLAR SYSTEM Lisse GO 54 Chandra Observations of Comet C/2013 A1 (Siding Spring)'s Encounter With Mars
16200073 STARS AND WD Guinan GO 80 The ABCs of the old G1.5V/G2.5V/M4-5V Star System 16 Cygni: Calibrating Coronal X-ray Emission for Old Benchmark Stars
16200075 STARS AND WD Preibisch GO 75 Completing the Chandra survey of the Carina Nebula: the cluster NGC 3293
16200105 STARS AND WD Green GO 88 Rejuvenation of the Innocent Bystander: Testing Spin-Up in a Dwarf Carbon Star Sample
16200111 STARS AND WD Naze LP 350 HD191612 - constraining the structure of a massive magnetosphere
16200155 STARS AND WD Pooley TOO 50 Catching an FUor in the Act: Chandra ToO Observations of Extreme Accretion onto Young Stars
16200165 STARS AND WD Feigelson GO 60 RCW 38: A Unique Laboratory for the Formation and Dynamics of Young Star Clusters
16200199 STARS AND WD Hofner GO 80 A CHANDRA Study of the Massive Protostar IRAS16562-3959
16200225 STARS AND WD Huenemoerder GO 150 A Deep X-ray look at a very massive star: HETGS spectroscopy of the blue hypergiant HIP 101364
16200249 STARS AND WD Poppenhaeger GO 90 An age-activity calibration for old low-mass stars
16200297 STARS AND WD Gizis GO 50 The X-Ray Corona of a Flaring L Dwarf
16200333 STARS AND WD Czesla GO 30 The cool corona of HD 209458
16200348 STARS AND WD Miller GO 21 Atmospheric heating in an irradiated transiting super-Earth and super-Neptune
16200379 STARS AND WD Ignace GO 17 A Study of Colliding Winds in Short Period B Star Binaries
16200403 STARS AND WD Schneider GO 130 Challenging accretion models with an HETG observation of T Tau
16200417 STARS AND WD Townsley GO 100 Massive Star Generations
16200570 STARS AND WD Rahman GO 150 X-Ray Investigation of the Most Luminous OB Association in the Galaxy
16200688 STARS AND WD Reynolds GO 10 Characterizing a New Variable Hard X-ray Source in the Planetary Nebula G343.3-0.6
16200744 STARS AND WD Ayres GO 60 Alpha Centauri at a Crossroads
16200747 STARS AND WD Sahai GO 10 Investigating Active Accretion, Flare Activity and a 50 Million Degree Corona in the cool AGB Star, Y Gem
16200849 STARS AND WD Guinan GO 40 The Secret Lives of Cepheids: Are Cepheids X-ray Variables?
16200863 STARS AND WD Drake LP 500 The Chandra-Kepler Flare Survey
16300107 WD BINARIES AND CV Kilic GO 48 Extremely Low-Mass White Dwarfs with Massive Companions
16300574 WD BINARIES AND CV Karovska GO 80 The Elusive Soft Emission from Hard X-ray Symbiotic System RT Cru
16300839 WD BINARIES AND CV Orio GO 100 V794 Aql: evolution at high mass transfer rate
16300874 WD BINARIES AND CV Nelson TOO 100 Probing mass ejection in novae with X-ray grating spectroscopy
16300876 WD BINARIES AND CV Mukai GO 20 Is the Nova V2672 Oph a Luminous X-ray Source in Quiescence?
16300891 WD BINARIES AND CV Sokoloski GO 150 Mutual influence between the two stars in T Pyxidis
16400006 BH AND NS BINARIES Kaastra GTO/TOO 80 Hunting for discrete spectral features in the Rapid Burster
16400093 BH AND NS BINARIES Prestwich GO 75 Is there an HLX in the Lyman-alpha Galaxy Haro 11?
16400124 BH AND NS BINARIES Ajello TOO 10 CHANDRA TOOs FOR FERMI GALACTIC PLANE TRANSIENTS
16400143 BH AND NS BINARIES Paizis TOO 20 INVESTIGATING NEW INTEGRAL SOURCES WITH Chandra
16400153 BH AND NS BINARIES Pooley TOO 20 Transient LMXBs in Globular Clusters
16400196 BH AND NS BINARIES Plotkin TOO 135 Following a black hole X-ray transient through the transition into quiescence
16400255 BH AND NS BINARIES Israel GO 40 Glimpsing a Chandra Population of new X-ray Pulsators
16400288 BH AND NS BINARIES Miller TOO 80 Wind-Triggered Disk Wind Spectroscopy of GRS 1915+105
16400294 BH AND NS BINARIES Miller TOO 120 The Ins and Outs of Disk Accetion in Black Hole Transient
16400301 BH AND NS BINARIES Strader GO 33 A Black Hole in the Galactic Globular Cluster M10
16400324 BH AND NS BINARIES Corbel TOO 150 X-Ray Jets in Microquasars
16400332 BH AND NS BINARIES Diaz Trigo TOO 100 A STUDY OF THE RELATIVISTIC JET OF 4U1630-47
16400369 BH AND NS BINARIES Jonker TOO 200 Chandra ToO observations of Gaia-discovered tidal disruption events
16400393 BH AND NS BINARIES Chakrabarty TOO 150 Narrow Lines from a Slowly Rotating Neutron Star
16400423 BH AND NS BINARIES Wijnands TOO 150 Crust cooling of accretion-heated neutron stars
16400444 BH AND NS BINARIES Chakrabarty TOO 4 Precise Localization of Transient Low-Mass X-ray Binaries
16400466 BH AND NS BINARIES King TOO 80 Following the Ultra-Fast Winds in the Stellar-Mass Black Hole, IGR 17091-3624
16400507 BH AND NS BINARIES Cackett GO 150 Crustal cooling from KS 1731-260 14 years into quiescence
16400537 BH AND NS BINARIES Grinberg TOO 24 Filling the gap in understanding the wind structure of HDE 226868 /Cyg X-1
16400546 BH AND NS BINARIES Degenaar GO 45 The nature of the transient X-ray binary Swift J1910.2-0546
16400552 BH AND NS BINARIES Laffon GO 20 Looking for evidence of a pulsar wind nebula or a gamma-ray binary associated with the TeV source HESS J1832-093
16400577 BH AND NS BINARIES Neilsen TOO 120 An Integrated Approach to Winds, Jets, and State Transitions
16400639 BH AND NS BINARIES Homan TOO 32 The short-orbital-period black-hole X-ray binary Swift J1753.5-0127 in quiescence
16400764 BH AND NS BINARIES Brorby GO 70 X-RAYS FROM GREEN PEA ANALOGS
16400845 BH AND NS BINARIES Li GO 46 Ultraluminous X-rays from the historical supernova 1986L: Testing stellar mass black hole scenario for the ULX origin
16400852 BH AND NS BINARIES Strohmayer GO 100 Constraining Neutron Star Properties with Chandra Observations of Millisecond Pulsars
16400865 BH AND NS BINARIES Linares GO 90 Spying on millisecond pulsar paradise: Chandra+GBT monitoring of M28
16400867 BH AND NS BINARIES Nowak GO 20 What is the Orbital Period of the Hierarchical Triple Candidate 4U 2129+47?
16400877 BH AND NS BINARIES Walton TOO 100 Broadband X-ray Observations of a High-State from the Hyper-luminous X-ray Source M82 X-1
16400905 BH AND NS BINARIES Ribo GO 60 Accretion/ejection coupling in the first Be/BH system
16500009 SN, SNR AND ISOLATED NS Sasaki GO 50 The possible PWN candidate in the LMC SNR [HP99] 456
16500090 SN, SNR AND ISOLATED NS Berger TOO 20 Rapid Observations of Short-Duration Gamma-Ray Bursts: Accurate Positions Hold the Key to the Progenitor Population
16500118 SN, SNR AND ISOLATED NS Burrows GO 140 CHANDRA CYCLE 16 SPATIAL AND SPECTRAL MONITORING OF SN 1987A
16500129 SN, SNR AND ISOLATED NS Reynolds GO 50 G141.2+5.0: An Unusual New Pulsar-Wind Nebula
16500168 SN, SNR AND ISOLATED NS MEREGHETTI GO 50 High angular resolution study of the mode-switching PSR B0943+10
16500197 SN, SNR AND ISOLATED NS Slane GO 100 Changes in Latitude: A Chandra Study of G296.5+10.0
16500286 SN, SNR AND ISOLATED NS Halpern GO 40 The Energetic Magnetar in HESS J1713-381/CTB 37B
16500341 SN, SNR AND ISOLATED NS Tiengo TOO 70 Measuring magnetar distance from the dust echo of a bright burst
16500362 SN, SNR AND ISOLATED NS Klochkov GO 90 Revealing the nature of the Central Compact Object candidate CXOU J181852.0-150213
16500414 SN, SNR AND ISOLATED NS Miceli GO 10 Investigating the nature of AX J1714.1-3912
16500418 SN, SNR AND ISOLATED NS Margutti TOO 50 Mapping the Zoo of engine driven explosions with late-time X-rays
16500454 SN, SNR AND ISOLATED NS Kamitsukasa GO 30 Revisiting Vela shrapnel D: Understanding the dynamics of the SNR ejecta interaction with an interstellar cloud
16500486 SN, SNR AND ISOLATED NS Gotthelf GO 160 HESS~J1640-465: Powering the most luminous gamma-ray source in the Galaxy
16500511 SN, SNR AND ISOLATED NS Kaspi TOO 1680 Target-of-Opportunity Chandra Observations of Glitching High-B Radio Pulsars: Searching for Magnetar Metamorphoses
16500533 SN, SNR AND ISOLATED NS Reynolds GO 20 CHARACTERIZING A NEW RADIO FAINT SNR: G309.4-0.1
16500534 SN, SNR AND ISOLATED NS Margutti TOO 10 Energetics and Environment of Hydrogen-poor Core-Collapse SNe
16500556 SN, SNR AND ISOLATED NS Pavlov GO 130 The puzzling dynamic nebula powered by the pulsar B1259-63 in a high-mass binary
16500634 SN, SNR AND ISOLATED NS Rangelov GO 50 Snap-shot survey of unidentified Fermi sources
16500640 SN, SNR AND ISOLATED NS Rea TOO 2465 PROMPT STUDY OF MAGNETAR OUTBURSTS WITH CHANDRA
16500642 SN, SNR AND ISOLATED NS Pires GO 20 A possible near-infrared counterpart for the isolated neutron star in the Carina Nebula
16500703 SN, SNR AND ISOLATED NS Posselt GO 78 The cooling of the Cas A CCO: fast or slow?
16500705 SN, SNR AND ISOLATED NS Borkowski LP 400 Nonuniform expansion and brightening of the youngest Galactic SNR G1.9+0.3
16500718 SN, SNR AND ISOLATED NS Borkowski GO 100 Expansion of Kes 73, a shell supernova remnant containing a magnetar
16500720 SN, SNR AND ISOLATED NS Troja TOO 50 IDENTIFY THE SIGNATURE OF NEUTRON STAR MERGERS THROUGH RAPID CHANDRA/HUBBLE OBSERVATIONS OF A SHORT GRB
16500739 SN, SNR AND ISOLATED NS Yamaguchi GO 70 (Re-)Constraining the Cosmic-Ray Acceleration Efficiency and Magnetic Field Strength in the Northeast Rims of RCW 86
16500768 SN, SNR AND ISOLATED NS Posselt GO 35 The proper motion of the isolated neutron star RXJ0806.4-4123
16500812 SN, SNR AND ISOLATED NS Pannuti GO 50 New Chandra Observations of the Archetypical Mixed-Morphology Galactic Supernova Remnant W28 (G6.4-0.1)
16500832 SN, SNR AND ISOLATED NS Kargaltsev GO 120 X-RAY COUNTERPARTS OF PUZZLING GEV-TEV SOURCES
16500844 SN, SNR AND ISOLATED NS Marelli GO 130 Deep study on the proper motion and collimated tail of the oldish PSR J2055+2539
16500869 SN, SNR AND ISOLATED NS Fruchter TOO 120 The Astrophysics of the Most Energetic Gamma-Ray Bursts
16500912 SN, SNR AND ISOLATED NS Fruchter GO 120 The Burst of the Century
16620053 NORMAL GALAXIES: X-RAY POPULATIONS Garmire GTO 100 Monitoring the Tidal Interaction of the Dusty Object G2 Appraoching Sgr A*
16620080 NORMAL GALAXIES: X-RAY POPULATIONS Maccarone GO 60 AN EFFICIENT SURVEY FOR GLOBULAR CLUSTER BLACK HOLES WITHIN 20 MPC
16620121 NORMAL GALAXIES: X-RAY POPULATIONS Levine GO 50 Galaxies in Collision: Arp 273
16620187 NORMAL GALAXIES: X-RAY POPULATIONS Kaaret GO 98 Searching for Accreting Black Holes in Lyman Continuum Emitters
16620343 NORMAL GALAXIES: X-RAY POPULATIONS Gallo GO 95 Super-massive black holes and nuclear star clusters in late type galaxies
16620657 NORMAL GALAXIES: X-RAY POPULATIONS Darling GO 60 Massive Black Holes in Water Maser Merging Galaxies
16620677 NORMAL GALAXIES: X-RAY POPULATIONS Peacock GO 100 Does the IMF vary with galaxy mass? The X-ray binary population of a key galaxy, NGC7457
16620755 NORMAL GALAXIES: X-RAY POPULATIONS Williams LP 350 A Chandra Legacy Survey of the Disk of M31
16620759 NORMAL GALAXIES: X-RAY POPULATIONS Haggard TOO 100 Triggered Observations of the Tidal Disruption of G2 As It Encounters Sgr A*
16620791 NORMAL GALAXIES: X-RAY POPULATIONS Lin GO 40 Chandra Observation of an X-ray Outbursting Intermediate-mass Black Hole Candidate
16620871 NORMAL GALAXIES: X-RAY POPULATIONS van den Berg GO 10 S364 IN THE OLD OPEN CLUSTER M67: EXOPLANET HOST OR ACTIVE BINARY?
16700010 ACTIVE GALAXIES AND QUASARS Brandt GO 36 Shielding Gas Variations in Transforming Broad Absorption Line Quasars
16700095 ACTIVE GALAXIES AND QUASARS Fabbiano GO 245 The Complex Fe-K Emission of Compton-Thick AGNs
16700103 ACTIVE GALAXIES AND QUASARS Reines GO 92 Probing the Growth of Massive Black Holes in Dwarf Galaxies with Chandra and HST
16700128 ACTIVE GALAXIES AND QUASARS Brandt GO 46 The Nature of Quasars with Redshifted Broad Absorption Lines
16700135 ACTIVE GALAXIES AND QUASARS Greene GO 80 Extended X-ray Emission From a Quasar-driven Superbubble
16700161 ACTIVE GALAXIES AND QUASARS Pooley GO 70 Chandra observation of SDSS J2222+2745
16700185 ACTIVE GALAXIES AND QUASARS Harris TOO 35 Triggering Chandra to Detect an X-ray Counterpart to TeV Flaring from M87 During Cycle 16
16700223 ACTIVE GALAXIES AND QUASARS Harris GO 10 Keeping Tabs on the Unique Jet in M87 During Cycle 16
16700228 ACTIVE GALAXIES AND QUASARS Worrall GO 65 Investigating shocked gas at crucial jet power
16700232 ACTIVE GALAXIES AND QUASARS Gultekin GO 116 ULTRAMASSIVE BLACK HOLES: FUNDAMENTAL PLANE AND CORONAE
16700278 ACTIVE GALAXIES AND QUASARS Chartas GO 167 AGNs Formed in Protogalaxies Associated with Sub-DLAs
16700335 ACTIVE GALAXIES AND QUASARS Fabbiano GO 70 MERGER-TRIGGERED NUCLEAR ACTIVITY AT SUB-KILOPARSEC SCALES
16700345 ACTIVE GALAXIES AND QUASARS Piconcelli GO 214 The Central Engine of the Most Luminous Quasars
16700361 ACTIVE GALAXIES AND QUASARS Massardi GO 80 X-ray observations of the nuclear activity in strongly lensed star forming galaxies at redshift >1.5
16700373 ACTIVE GALAXIES AND QUASARS Maksym GO 90 Quasar and AGN Variability on 10-100 kyr Timescales
16700376 ACTIVE GALAXIES AND QUASARS Fan GO 14 Explanatory X-ray observation of a hyper-luminous quasar at the end of reionization era
16700427 ACTIVE GALAXIES AND QUASARS Meyer GO 225 Solving the X-ray Origin Problem in Large-scale Jets with Chandra and Fermi Observations
16700447 ACTIVE GALAXIES AND QUASARS Leighly GO 72 Probing the Physics of Quasar Outflows using Mini-LoBALs
16700470 ACTIVE GALAXIES AND QUASARS King LP 700 Uncovering the True Nature of Warm-Absorbing Winds: The Power of the Fe XXII Doublet
16700473 ACTIVE GALAXIES AND QUASARS Ojha GO 10 The very unusual gamma-ray source PMN J1603-4904 and its neighbors
16700512 ACTIVE GALAXIES AND QUASARS Goulding GO 42 3C190: Probing the extreme AGN blowout phase of galaxy evolution
16700515 ACTIVE GALAXIES AND QUASARS Lee LP 450 An X-ray, UV, and radio probe of the PG 1211+143 inflow-outflow dynamics
16700548 ACTIVE GALAXIES AND QUASARS Ponti TOO 280 X-ray monitoring of Sgr A* during outburst
16700636 ACTIVE GALAXIES AND QUASARS Cheung GO 90 Intermittent Outbursts in CGCG 292-057: Jet Duty Cycle and Jet-ISM Interactions
16700656 ACTIVE GALAXIES AND QUASARS Mushotzky GO 120 UNCOVERING AGN FUELING AND FEEDBACK IN DWARF GALAXIES
16700678 ACTIVE GALAXIES AND QUASARS Zauderer GO 120 X-Ray Production in the Unique Relativistic Tidal Disruption Event Sw1644+57
16700687 ACTIVE GALAXIES AND QUASARS LaMassa GO 50 The Curious Case of NGC 4968
16700713 ACTIVE GALAXIES AND QUASARS Gallerani GO 80 A novel method to constrain black hole and gas masses in z>6 quasars using the synergy of X-ray/millimeter observations
16700719 ACTIVE GALAXIES AND QUASARS Mingo GO 130 Strong shocks in 3C 15
16700780 ACTIVE GALAXIES AND QUASARS Lin GO 40 Chandra Observation of an Ultrasoft Active Galactic Nucleus with a 3.8 hr Periodicity
16700793 ACTIVE GALAXIES AND QUASARS Sun GO 182 Strong FR II galaxy 3C 220.1 in a cluster cool core
16700846 ACTIVE GALAXIES AND QUASARS Vieira GO 50 Is the Most Concentrated Infrared Luminosity Density in the Universe dominated by an AGN or a Hyper-Starburst?
16700859 ACTIVE GALAXIES AND QUASARS Wise XVP 2000 The Rise to Power: Half a Billion Years of Intense AGN Activity in the Merging Cluster Cygnus A
16700878 ACTIVE GALAXIES AND QUASARS Markowitz GO 100 Diffuse Extended Emission in Centaurus A: The best case with which to study AGN/Host Galaxy Interaction
16700901 ACTIVE GALAXIES AND QUASARS Saez GO 40 CONSTRAINING THE WIND-SHIELD SCENARIO OF PG 2112+059
16700907 ACTIVE GALAXIES AND QUASARS Irwin GO 210 Constraining the X-ray AGN Fraction Within Filaments of Galaxies
16800086 CLUSTERS OF GALAXIES Allen GO 145 Perseus: A New, Low-Redshift Anchor for Cluster Cosmology
16800273 CLUSTERS OF GALAXIES O'Sullivan GO 155 Building the intra-group medium from shock heated HI in the NGC 5903 galaxy group
16800287 CLUSTERS OF GALAXIES Rozo GO 120 Chandra Calibration of the Richness-Mass Relation of Galaxy Clusters: Enabling Cluster Cosmology with the DES
16800330 CLUSTERS OF GALAXIES Wong GO 16 Search for the outer boundary of the starburst galaxy: M82
16800337 CLUSTERS OF GALAXIES Bonafede GO 200 Low mach number shocks reaccelerating particles in the Intra-cluster Medium: the unique case of PLCKG287.0 +32.9
16800338 CLUSTERS OF GALAXIES Simionescu GO 20 An X-ray view of peculiar radio tails lacking optical counterparts in Abell 585
16800359 CLUSTERS OF GALAXIES Eckert GO 200 Ram-pressure stripping and ICM physics in an infalling galaxy group
16800365 CLUSTERS OF GALAXIES Ogrean GO 197 A Cosmic Ray Mystery: No Shock Across a Radio Relic in ZwCl 2341.1+0000
16800377 CLUSTERS OF GALAXIES Russell GO 200 The origin of the massive cold gas flows in the galaxy cluster A1664
16800411 CLUSTERS OF GALAXIES Sarazin GO 210 The Burst Cluster: Dark Matter in a Merging Cluster Host of the Short Gamma-Ray Burst GRB050509B
16800415 CLUSTERS OF GALAXIES Donahue GO 87 UNMASKING GALAXY CLUSTERS MASQUERADING AS QUASARS
16800445 CLUSTERS OF GALAXIES Boehringer GO 220 Completing the survey of the most massive southern galaxy clusters
16800453 CLUSTERS OF GALAXIES Kato GO 40 High-Resolution Imaging of Newborn Shock Fronts in Nearby Early-Phase Merging Cluster CIZA J1358.9-4750
16800455 CLUSTERS OF GALAXIES van Weeren GO 165 Abell 3411: Confronting the Relic Shock Acceleration Mystery
16800461 CLUSTERS OF GALAXIES McNamara GO 70 X-ray Imaging of a Gas Rich BCG in the RXJ0821.0+0752 Cluster
16800528 CLUSTERS OF GALAXIES David LP 340 The Highly Perturbed X-ray Bright Group NGC 5044
16800593 CLUSTERS OF GALAXIES Giacintucci GO 110 The unexpected SZ structure of the extreme cool core in the galaxy cluster RXCJ1504
16800596 CLUSTERS OF GALAXIES Vrtilek GO 160 NGC 741: Mergers and AGN feedback at the group scale
16800622 CLUSTERS OF GALAXIES Forman LP 370 Probing the Physics of the ICM in the Dynamically Young Cluster A1367
16800637 CLUSTERS OF GALAXIES Markevitch GO 200 THERMAL AND (OR?) RELATIVISTIC MATTER IN THE BRIGHTEST CLUSTER RADIO RELIC
16800665 CLUSTERS OF GALAXIES van Weeren GO 26 Exciting Shock Physics in Faint Galaxy Cluster Outskirts
16800690 CLUSTERS OF GALAXIES McDonald LP 588 A MASS-LIMITED SURVEY OF GALAXY CLUSTERS AT 1.2 < z < 1.7: PROBING THE PHYSICS OF THE ICM DURING ITS ASSEMBLY
16800711 CLUSTERS OF GALAXIES de Gasperin GO 27 A first look at the most powerful radio relic cluster
16800758 CLUSTERS OF GALAXIES McDonald GO 153 DISTANT GALAXY CLUSTERS HOSTING EXTREME CENTRAL GALAXIES
16800783 CLUSTERS OF GALAXIES Baum GO 130 First Chandra Observation of a remarkable 'String of Pearls' between two Merging Elliptical Galaxies
16800794 CLUSTERS OF GALAXIES Su GO 10 Investigating a Potential Benchmark of Relaxed Clusters out to the Virial Radius
16800805 CLUSTERS OF GALAXIES Sarazin GO 94 PKS B1400-33 and Abell S753: A Very Bright Radio Relic in a Poor Cluster
16800829 CLUSTERS OF GALAXIES Vikhlinin XVP 2100 Chandra mapping of the cosmic web converging on the virialization region of Abell 1795
16800848 CLUSTERS OF GALAXIES Hlavacek-Larrondo GO 70 Chandra observations of the massive galaxy cluster MACS J1447.4+0827 at z=0.3755
16900624 EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS Levan TOO 30 A Chandra/HST survey of dark gamma-ray bursts
16900937 EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS Hasinger XVP 1250 Black Hole Fingerprints from Cosmic Dawn to Cosmic Noon
16910519 GALACTIC DIFFUSE EMISSION AND SURVEYS Clavel GO 480 Characterizing past outbursts from Sagittarius A*
16910568 GALACTIC DIFFUSE EMISSION AND SURVEYS Tomsick TOO 20 Localizing NuSTAR-Discovered Sources in the Galactic Plane
16910752 GALACTIC DIFFUSE EMISSION AND SURVEYS Slavin GO 150 The Local Leo Cold Cloud: Separating Solar Wind Charge Exchange from Local Bubble X-ray Emission
16910820 GALACTIC DIFFUSE EMISSION AND SURVEYS Tomsick GO 29 Follow-up of Serendipitous NuSTAR Sources in the Galactic Plane

Subject Category: SOLAR SYSTEM

Proposal Number: 16100908

Title: Chandra Observations of Comet C/2013 A1 (Siding Spring)'s Encounter With Mars

Type: GO Total Time (ks): 54

PI Name: Carey Lisse

Abstract: Comet Siding Spring's extremely close approach to Mars (within 138,000 km, or 1/3 the Earth-Moon distance) on 19 Oct 2014 offers us the first opportunity in the Chandra era to study the interaction between the solar wind, a comet's extended atmosphere, and a planet's exosphere. Chandra will also be able to support the observations of the comet by the NASA and ESA Mars spacecraft as they study the comet during its close flyby. X-ray imagery, photometric lightcurves, and x-ray emission spectra obtained during the encounter will be compared to the Chandra comet database of 12 comets to determine the solar wind flux at Mars, the draping of the solar wind around the planet, and the input of comet gases into the Martian exosphere.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
Comet C/2013 A1 Siding Spring ACIS-S None 54.0

Subject Category: STARS AND WD

Proposal Number: 16200073

Title: The ABCs of the old G1.5V/G2.5V/M4-5V Star System 16 Cygni: Calibrating Coronal X-ray Emission for Old Benchmark Stars

Type: GO Total Time (ks): 80

PI Name: Edward Guinan

Abstract: 16 Cyg ABC is an important G1V+G2.5V+M4V triple system with a precisely-determined Kepler asteroseismic age = 6.8+/-0.4 Gyr, an excellent parallax (d =21.1pc) and ongoing Ca II HK & uvby photometric monitoring. The G2.5V star also hosts a Jupiter-size planet (Bb). The AB components hold a prominent place in astrophysics for studying the evolution, dynamo activity and coronae of a pair of "future Suns." However, the system has not been detected in X-rays. We propose an 80-ksec ACIS-I exposure to characterize the stellar coronae of these benchmark stars. The observation will also include the dM4 companion to A (16 Cyg C; ~3.6" separation),which ties to our study of M-star coronal evolution over time by providing an Lx-Age anchor-point in the difficult-to-determine old age range of M-stars.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+19:41:50.50 +50:31:17.00 16 Cyg ABC ACIS-I None 80.0

Subject Category: STARS AND WD

Proposal Number: 16200075

Title: Completing the Chandra survey of the Carina Nebula: the cluster NGC 3293

Type: GO Total Time (ks): 75

PI Name: Thomas Preibisch

Abstract: We propose to complete and conclude Chandra's investigation of the young star clusters in the Carina Nebula Complex with an observation of the last still un-observed massive cluster, NGC3293. Although NGC3293 is probably the second most massive cluster in the entire complex, its low-mass population is basically unknown. A single ACIS-I pointing will reveal the low-mass cluster members and provide a census of the cluster population and its total mass. This information is urgently needed for the study of the global properties and the history of the Carina Nebula Complex. The Chandra data will also allow us to search for isolated neutron stars that are the remnants of the about 20 supernovae that are thought to have occurred in this cluster and for diffuse X-ray emission.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+10:35:50.00 -58:14:00.00 NGC 3293 ACIS-I None 75.0

Subject Category: STARS AND WD

Proposal Number: 16200105

Title: Rejuvenation of the Innocent Bystander: Testing Spin-Up in a Dwarf Carbon Star Sample

Type: GO Total Time (ks): 88

PI Name: Paul Green

Abstract: Carbon stars (C>O) were long assumed to all be giants, because only AGB stars dredge up significant carbon into their atmospheres. We now know that dwarf carbon (dC) stars are actually far more common than C giants. These dC stars are hypothesized to have accreted C-rich envelope material from an AGB companion, in systems that have likely undergone a planetary nebula phase, eventually yielding a white dwarf and a dC star that has gained both significant mass and angular momentum. To test whether the X-ray emission strength and spectral properties are consistent with a rejuvenated dynamo, we propose a Chandra pilot study of dCs selected from the SDSS; some have hot white dwarf companions (indicating more recent mass transfer), and all show Balmer emission lines (a sign of activity).

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+15:19:06.00 +50:07:02.90 CBS311 ACIS-S None 27.9
+09:01:28.30 +32:38:33.60 SDSS J090302.86+385527.4 ACIS-S None 18.5
+15:48:59.70 +34:18:21.70 SDSS J154859.72+341821.7 ACIS-S None 16.2
+16:37:18.60 +27:40:26.50 SDSS J163718.64+274026.5 ACIS-S None 25.9

Subject Category: STARS AND WD

Proposal Number: 16200111

Title: HD191612 - constraining the structure of a massive magnetosphere

Type: LP Total Time (ks): 350

PI Name: Yael Naze

Abstract: We propose, through high resolution spectroscopy, to derive the structure of the magnetically confined winds in HD191612, a prototypical magnetic massive star. In such objects, X-rays arise from the strong shocks between stellar wind flows from opposite hemispheres, guided by the field towards the magnetic equator. While X-ray luminosities of magnetic OB stars are now known and fairly well reproduced by models, this is not the case for the structure (position, velocity, temperature) of the magnetospheric plasma, crucially needed for a deep understanding of magnetism at the top of the main sequence. The unique diagnostics provided by HETG will provide the missing information and, together with existing optical and UV observations, enable the full modeling of prototypical confined winds.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+20:09:28.60 +35:44:01.30 HD191612 ACIS-S HETG 150.0
+20:09:28.60 +35:44:01.30 HD191612 ACIS-S HETG 200.0

Subject Category: STARS AND WD

Proposal Number: 16200155

Title: Catching an FUor in the Act: Chandra ToO Observations of Extreme Accretion onto Young Stars

Type: TOO Total Time (ks): 50

PI Name: David Pooley

Abstract: FU Orionis (FUor) outbursts are a transitory rapid accretion phase in the evolution of young stellar objects. We propose to obtain an X-ray spectrum during the rise to peak brightness of an FUor with Chandra. This phase has never been observed in X-rays and could reveal important information about the nature and source of the X-ray emission in these objects. In particular, it would provide a unique test of whether high-velocity jets are formed during the intense accretion event. These jets are expected to form X-ray dissociation regions, and X-ray emission does correlate with outflows from young stellar objects. If these jets only exist during the high levels of accretion during the rise to peak brightness, as they are thought to, X-ray observations during this time are crucial.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
FUor Outburst ACIS-S None 50.0

Subject Category: STARS AND WD

Proposal Number: 16200165

Title: RCW 38: A Unique Laboratory for the Formation and Dynamics of Young Star Clusters

Type: GO Total Time (ks): 60

PI Name: Eric Feigelson

Abstract: Most stars form in rich clusters that quickly dissipate into field stars. The theory of cluster expansion and dynamical ejection of stars has few empirical constraints today. RCW 38 is a unique young star cluster seen at a critical juncture in its history just after the expulsion of molecular gas by massive stars during its brief stage of expansion and non-equilibrium dynamics. It has the densest core of any star cluster near the Sun with unequilibrated spatial structure. We proposed a 100 ks exposure (part GO and part GTO) to be combined with the archived 100 ks and improved near-infrared data. The known cluster population should triple to 2000 stars; star masses and ages will be estimated. RCW 38 will give a superb empirical foundation for understanding cluster early evolution.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+08:59:05.50 -47:30:40.00 RCW 38 ACIS-I None 60.0

Subject Category: STARS AND WD

Proposal Number: 16200199

Title: A CHANDRA Study of the Massive Protostar IRAS16562-3959

Type: GO Total Time (ks): 80

PI Name: Peter Hofner

Abstract: The formation of massive stars remains a challenge to astrophysics. X-ray observations are important, but only a small number of massive potostars have been observed, all of them with B-type star luminosities. In cycle 14 we carried out a short (5ks) observation toward the newly discovered massive protostar IRAS16592-3959 to varify detectability. IRAS16592-3959 is the most luminous protostar known (O8) , and we have clearly detected this object. Here we propose an 80 ks ACIS-I observation with the following science goals: 1) Obtain a higher S/N spectrum of the protostar including Fe line detection and search for flare like variability, 2) Search for X-ray emission form the radio jets, and 3) together with 2MASS and Spitzer data determine the cluster environment of the massive protostar.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+16:59:41.60 -40:03:43.60 IRAS 16562-3959 ACIS-I None 80.0

Subject Category: STARS AND WD

Proposal Number: 16200225

Title: A Deep X-ray look at a very massive star: HETGS spectroscopy of the blue hypergiant HIP 101364

Type: GO Total Time (ks): 150

PI Name: David Huenemoerder

Abstract: We propose to obtain an ACIS-S/HETGS spectrum of one of the most massive and luminous stars in the Galaxy: the blue hypergiant (B3Ia+) HIP 101364. This star is a representative member of the class of very massive stars. The new observations will result in the first measurement of X-ray spectral lines and their ratios in a blue hypergiant and allow for a comparative analysis of X-ray properties between massive stars at different but related evolutionary stages: luminous blue variables, Wolf-Rayet stars, and blue hypergiants stars. Except for the latter, high resolution X-ray spectra already exist for all other types. The analysis of new data will provide a new understanding of how the most massive stars shed mass during their pre-supernova evolution.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+20:32:41.00 +41:14:29.20 HIP 101364 ACIS-S HETG 150.0

Subject Category: STARS AND WD

Proposal Number: 16200249

Title: An age-activity calibration for old low-mass stars

Type: GO Total Time (ks): 90

PI Name: Katja Poppenhaeger

Abstract: Low-mass stars are highly interesting targets: we are able to detect planets in their habitable zones, and upcoming searches for biomarkers in exoplanet atmospheres will focus on low-mass star systems due to their ubiquity and proximity. We aim to develop an age-activity calibration for old low-mass stars, using wide binary systems consisting of an M or K dwarf and a white dwarf. The age of the system is determined by the WD cooling time plus its progenitor lifetime, yielding reliable ages in the regime >1 Gyr. For an exploratory sample of 7 systems where we have already derived ages, we propose to perform Chandra ACIS-S observations to determine the X-ray luminosities of the M dwarfs and correlate their stellar activity with age. We ask for a total observing time of 110 ks.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+07:57:43.40 +28:06:45.00 2MASS 07574337+2806456 ACIS-S None 15.0
+11:08:06.50 -05:13:47.20 GJ 1142 A ACIS-S None 15.0
+11:45:55.90 +31:49:29.90 NLTT28469 ACIS-S None 20.0
+23:54:00.70 -33:16:29.90 L577-71 ACIS-S None 15.0
+23:43:52.90 +32:35:37.80 LP347-5 ACIS-S None 10.0
+01:23:15.90 -02:08:44.80 NLTT4616 ACIS-S None 15.0

Subject Category: STARS AND WD

Proposal Number: 16200297

Title: The X-Ray Corona of a Flaring L Dwarf

Type: GO Total Time (ks): 50

PI Name: John Gizis

Abstract: We propose the first observation to determine both the X-ray luminosity and white light flare of a L-type dwarf star. Late-M and L dwarfs show a remarkable drop in chromospheric and coronal activity levels, but surprisingly strong radio emission, a change is that neither fully understood theoretically. Observations are needed to establish empirical relationships and compare to those of warmer flare stars. Kepler observations have already measured the flare rate, and we now propose Chandra observations. We will be able to test the hypothesis that the X-ray corona scales with the flare rate, and compare the relative X-ray, radio, chromosphere and flare energy budget. The target,WISEP J190648.47+401106.8, is uniquely suited for this project because of the Kepler data.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+19:06:48.50 +40:11:06.80 WISEP J190648.47+401106.8 ACIS-S None 50.0

Subject Category: STARS AND WD

Proposal Number: 16200333

Title: The cool corona of HD 209458

Type: GO Total Time (ks): 30

PI Name: Stefan Czesla

Abstract: We propose to measure the soft X-ray emission of the planet host-star HD 209458 using a 30 ks Chandra HRC-I snapshot. The transiting hot Jovian HD 209458b is one of only two exoplanets with a reliably detected expanded atmosphere and has become a cornerstone of planetary research. Although current models predict that stellar X-ray and extreme ultraviolet irradiation is crucial for the formation of the expanded atmosphere and possibly resulting mass-loss, it has so far eluded detection in HD 209458. The proposed observation will enable us to measure the soft stellar X-ray emission, calculate the level of planetary X-ray and EUV irradiation, compute the mass-loss and compare it to previous measurements, and provide a highly desired constraint for planetary model atmospheres.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+22:03:10.80 +18:53:03.50 HD 209458 HRC-I None 30.0

Subject Category: STARS AND WD

Proposal Number: 16200348

Title: Atmospheric heating in an irradiated transiting super-Earth and super-Neptune

Type: GO Total Time (ks): 21

PI Name: Brendan Miller

Abstract: We propose Chandra observations of HD 97658 (13 ks) and HAT-P-11 (8 ks) to determine the high-energy radiation incident upon their short-period transiting planets. HD 97658 b is a hot super-Earth with a density between Earth and ice giants, while HAT-P-11 b is a hot super-Neptune orbiting an active K4 star. Measurement of the stellar X-ray (and UV; we contribute Swift time) luminosities provides a current epoch estimate of atmospheric heating and constrains whether these planets are likely to experience significant mass loss through atmospheric evaporation over their total lifetimes. These observations provide essential empirical input for understanding and modeling the potential evolutionary transformation of hot gas giants into less massive and more dense remnants.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+11:14:33.20 +25:42:37.40 HD 97658 ACIS-S None 13.0
+19:50:50.20 +48:04:51.10 HAT-P-11 ACIS-S None 8.0

Subject Category: STARS AND WD

Proposal Number: 16200379

Title: A Study of Colliding Winds in Short Period B Star Binaries

Type: GO Total Time (ks): 17

PI Name: Richard Ignace

Abstract: We request 17 ksec to measure the X-ray emissions from two B+B binaries: AH Cep and CW Cep. These are short period, double-lined spectroscopic, eclipsing binaries, and so all fundamental orbital and stellar parameters are known. All 4 stars in these 2 binaries are B0.5V stars of nearly equal mass. Given estimates for mass loss and wind speeds, the respective colliding wind shocks should be adiabatic and located midway between the components. These stars have never been detected in X-rays. Based on the scaling of LX = 1e-7 LBol, we anticipate X-rays from B star winds. We expect detection of the colliding wind shock as signified by a relatively high hardness ratio and excess X-ray brightness; if so, this would be an exciting first detection of colliding wind X-rays from a B+B binary.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+22:47:52.90 +65:03:43.70 AH Cep ACIS-I None 10.0
+23:04:02.20 +63:23:48.70 CW Cep ACIS-I None 7.0

Subject Category: STARS AND WD

Proposal Number: 16200403

Title: Challenging accretion models with an HETG observation of T Tau

Type: GO Total Time (ks): 130

PI Name: Christian Schneider

Abstract: Young, accreting stars often emit soft X-rays from the accretion shock on the stellar surface. The favored model predicts high densities in the accretion spot compatible with most observations. However, X-ray data of the nearest accreting star (TW Hya) and of the eponymous T Tau show signatures incompatible with shock models. Proposed model modifications require an enhanced density of higher temperature tracers compared to cooler plasma. We propose to test this with a 130 ks HETG observation of T Tau to (a) provide the first significant measurement of its Ne IX triplet (high temperature) to augment XMM-Newton data of the O VII triplet (low temperature) and (b) to search for spatial offsets of the soft X-rays which could explain the lack of accretion signatures in T Tau by jet emission.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+04:21:59.40 +19:32:06.40 T Tau ACIS-S HETG 130.0

Subject Category: STARS AND WD

Proposal Number: 16200417

Title: Massive Star Generations

Type: GO Total Time (ks): 100

PI Name: Leisa Townsley

Abstract: This survey extends and enhances Chandra/ACIS studies of massive stars by sampling both very young O stars ionizing ultracompact HII regions (UCHIIRs) and the aged and evolved massive stars in Young Massive Clusters (YMCs). This will double the Chandra sample of UCHIIRs and provide dozens of X-ray spectra on older massive stars. We combine two new ACIS-I pointings with GTO and archival data to achieve an economical study of W42 and W33, nearby massive star-forming regions <1 Myr old, plus the much older and more distant YMCs Cl 1813-178 and Red Supergiant Cluster 1. These sensitive observations will also document pre-main sequence populations and trace the effects of massive star feedback by mapping diffuse X-rays from supernova remnants and wind-shocked plasma.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+18:38:14.60 -06:49:19.00 W42 ACIS-I None 60.0
+18:14:13.50 -17:55:42.00 W33 ACIS-I None 40.0

Subject Category: STARS AND WD

Proposal Number: 16200570

Title: X-Ray Investigation of the Most Luminous OB Association in the Galaxy

Type: GO Total Time (ks): 150

PI Name: Mubdi Rahman

Abstract: We propose conducting 150 ks ACIS-I observations of the Galaxy's most luminous OB association, the recently-discovered Dragonfish Association. The observations will enable us to characterize the upper-end of the X-ray luminosity function to determine the membership of the most massive stars within the association. This will provide the first systematic characterization of the association members, impossible through any other means given the large extinguishing column and on-sky contamination. Based on the results of these observations, we will investigate the energetics of this association and how feedback is driven into the interstellar medium.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+12:12:20.10 -63:15:30.90 Dragonfish Association ACIS-I None 150.0

Subject Category: STARS AND WD

Proposal Number: 16200688

Title: Characterizing a New Variable Hard X-ray Source in the Planetary Nebula G343.3-0.6

Type: GO Total Time (ks): 10

PI Name: Mark Reynolds

Abstract: We request a 10 ks observation of a new hard X-ray point source associated with the planetary nebula G343.3-0.6. Discovery observations with Swift reveal a bright (f_x >~ 5e-12 erg s^-1 cm^-2) and highly variable source suggesting the presence of an active binary system in this planetary nebula. The proposed Chandra observation will enable us to constrain the X-ray spectral variability and the sub-arcsecond source position will enable the location of the optical/nIR counterpart of this enigmatic source.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+17:01:28.00 -43:05:55.00 G343.3-0.9 ACIS-S None 10.0

Subject Category: STARS AND WD

Proposal Number: 16200744

Title: Alpha Centauri at a Crossroads

Type: GO Total Time (ks): 60

PI Name: Thomas Ayres

Abstract: Nearby Alpha Centauri (G2V+K1V) contains the two best characterized solar-like dwarf stars, which also have the best studied X-ray activity cycles, extending back to the 1970's. Objective is to continue tracking the evolving multi-decadal high-energy narrative of Alpha Cen with semiannual HRC-I pointings in Cycles 16-18, as the system reaches a coronal crossroads: solar twin A rising toward cycle maximum, K-type companion B sinking into a minimum. HST/STIS UV spectra will support and leverage the X-ray measurements by probing subcoronal dynamics, with connection to the corona through the FUV Fe XII forbidden line. Only Chandra can resolve the AB X-ray sources as the Alpha Cen orbit also reaches a crossroads in 2016.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+14:39:28.30 -60:49:57.20 ALPHA CEN HRC-I None 60.0

Subject Category: STARS AND WD

Proposal Number: 16200747

Title: Investigating Active Accretion, Flare Activity and a 50 Million Degree Corona in the cool AGB Star, Y Gem

Type: GO Total Time (ks): 10

PI Name: Raghvendra Sahai

Abstract: We propose to make multi-epoch observations of the X-ray (and radio contiuum) emission from a cool AGB star, Y Gem. This star shows relatively strong X-ray emission implying the presence of 50 million degree coronal gas, and highly-variable FUV and NUV fluxes - likely evidence of variable accretion onto a magnetized accretion disk in a binary system. Y Gem is the most prominent member of a new class of AGB stars with FUV excesses identified using the GALEX archive. Our study will allow us to study the never-before explored phase of an active accretion disk in an AGB star with a binary companion. Such disks are believed to ultimately produce collimated jets that transform AGB circumsetllar envelopes into bipolar planetary nebulae.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+07:41:08.50 +20:25:44.30 Y Gem ACIS-S None 10.0

Subject Category: STARS AND WD

Proposal Number: 16200849

Title: The Secret Lives of Cepheids: Are Cepheids X-ray Variables?

Type: GO Total Time (ks): 40

PI Name: Edward Guinan

Abstract: We propose ACIS-I observations of the 9.84-day Cepheid beta Dor to confirm X-ray variability. The data will complement our Chandra/XMM data and HST FUV spectroscopy for this important star, whose FUV emission lines show phased 10,000 300,000 K plasma variability, peaking between pulsation phases 0.7 0.9 and originating from pulsation-induced shocks. We request two 45-ksec exposures of beta Dor to confirm the X-ray variability observed in our previous observations and help complete the X-ray light curve of this Cepheid. If confirmed, the phasing of the X-ray activity will contrast to that of the FUV emissions and provide crucial information on atmospheric heating mechanisms. We also propose a 40-ksec visit for the prototype Cepheid del Cep to confirm similar X-ray variability as beta Dor.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+22:29:10.30 +58:24:54.70 delta Cep ACIS-I None 40.0

Subject Category: STARS AND WD

Proposal Number: 16200863

Title: The Chandra-Kepler Flare Survey

Type: LP Total Time (ks): 500

PI Name: Jeremy Drake

Abstract: The Kepler K2 mission offers a unique chance to obtain the first simultaneous X-ray and white light (WL) observations of superflares on samples of nearby active, coeval stars. In large solar flares, X-ray emission represents only a few percent of the total energy dissipated, with WL and CME's dominating. For flaring active stars this implies up to 10% of Lbol is expended on flares! Chandra observations of rho Oph, the Pleiades and Praesepe simultaneous with K2 will observe superflares from 10^32-10^36 erg and test solar WL - X-ray relations for active stars. The results are central to flare energy release on stars through time, the impact of stellar flares and activity on protoplanetary disks and exoplanets, and the fundamental efficiency of magnetic dynamos in dissipating energy.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+16:27:17.20 -24:34:39.00 Rho Oph Cloud A ACIS-I None 100.0
+03:46:46.00 +24:04:06.00 Pleiades ACIS-I None 200.0
+08:39:50.00 +19:31:41.00 Praesepe ACIS-I None 200.0

Subject Category: WD BINARIES AND CV

Proposal Number: 16300107

Title: Extremely Low-Mass White Dwarfs with Massive Companions

Type: GO Total Time (ks): 48

PI Name: Mukremin Kilic

Abstract: After spending several dozen nights on the 6.5m MMT and the Kitt Peak 4m telescopes as part of the ELM Survey, we have identified 54 short period binary white dwarf (WD) systems, including half a dozen WDs with massive unseen companions. In cycle 14, we obtained Chandra observations of two of these targets and identified the first progenitors of underluminous supernovae .Ia. Here, we propose to obtain Chandra observations of the three remaining WD binary systems with massive companions. These systems have the best chance of containing neutron star companions among the 54 systems found in our survey, with a 42-65% likelihood of M>1.4 Msun companions. Our proposed three targets will provide an opportunity to study either new WD + NS systems or double WD progenitors of supernovae .Ia and Ia.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+14:43:42.70 +15:09:38.60 SDSS J144342.74+150938.6 ACIS-S None 1.3
+21:32:28.40 +07:54:28.20 SDSS J213228.36+075428.2 ACIS-S None 11.7
+08:11:33.60 +02:25:56.80 SDSS J081133.56+022556.8 ACIS-S None 35.0

Subject Category: WD BINARIES AND CV

Proposal Number: 16300574

Title: The Elusive Soft Emission from Hard X-ray Symbiotic System RT Cru

Type: GO Total Time (ks): 80

PI Name: Margarita Karovska

Abstract: RT Cru is a fascinating member of a new class of hard X-ray emitting symbiotic binaries showing X-ray emission extending to over 50keV. While its hard X-ray emission has been studied in detail, the soft component of the spectrum, including flares, remains elusive, since previous observations have focused on the high-energy regime. We propose Chandra HRC-S/LETG observations to determine the spatial, spectral, and temporal characteristics of the source of the soft X-ray emission with a goal to establish the origin of the soft component, and determine whether and how it is tied to the hard component. Determining the origin of the soft emission is a crucial piece of the puzzle to understanding the geometry, energetics, and the environment of WD accretion in this class of symbiotic systems.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+12:34:53.70 -64:33:56.00 RT Cru HRC-S LETG 80.0

Subject Category: WD BINARIES AND CV

Proposal Number: 16300839

Title: V794 Aql: evolution at high mass transfer rate

Type: GO Total Time (ks): 100

PI Name: Marina Orio

Abstract: V794 Aql, a VYScl or nova-like star in which a white dwarf, accretes at very high mass transfer rate mdot (~10(-8) solar masses) from a main sequence binary companion. Very few interacting white dwarf binaries show clear physical manifestation of such high mass transfer rate, which is very important to understand how recurrent novae and type I supernovae occur. Periodic "low states" at all wavelengths from optical to X-rays can be explained with a limit cycle that regulates the mdot through a physical mechanisms that could be due to a number of root causes: irradiation induced wind from the secondary and its periodic halt, spots on the secondary, the magnetic field of the WD. We propose to obtain a HETG spectrum that will clarify how these systems evolve.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+20:17:33.90 -03:39:50.90 V794 Aql ACIS-S HETG 100.0

Subject Category: WD BINARIES AND CV

Proposal Number: 16300874

Title: Probing mass ejection in novae with X-ray grating spectroscopy

Type: TOO Total Time (ks): 100

PI Name: Thomas Nelson

Abstract: We request a Chandra target-of-opportunity observation of the next X-ray bright nova discovered in outburst that is visible to the Very Large Array radio observatory. The resulting high resolution X-ray spectra will be used in conjunction with detailed multiwavelength light curves (especially in the radio regime) and photoionization modeling to study the mass ejection process in novae. The X-ray and radio data in tandem will enable us to estimate the mass ejected by the nova, and to characterize the mass loss evolution over the course of the outburst.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
Bright nova HRC-S LETG 100.0

Subject Category: WD BINARIES AND CV

Proposal Number: 16300876

Title: Is the Nova V2672 Oph a Luminous X-ray Source in Quiescence?

Type: GO Total Time (ks): 20

PI Name: Koji Mukai

Abstract: The very fast nova V2672 Oph had one of the shortest decay times (t2=2.3 d) and the broadest emission lines (FWZI up to 12,000 km/s) ever observed in novae. It may well be a recurrent nova with a near Chandrasekhar mass white dwarf. There is also a ROSAT all-sky survey Faint Source Catalog source consistent with its position: if confirmed, V2672 Oph would be only the third nova to have been detected in X-rays before the nova eruption. We therefore propose an ACIS-S imaging observation to provide the precise location, and rough timing and spectral characteristics of the ROSAT source. V2672 Oph may join V2487 Oph and V2491 Cyg as novae with quiescent X-ray luminosities not seen in normal cataclysmic variables.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+17:38:19.70 -26:44:13.90 V2672 Oph ACIS-S None 20.0

Subject Category: WD BINARIES AND CV

Proposal Number: 16300891

Title: Mutual influence between the two stars in T Pyxidis

Type: GO Total Time (ks): 150

PI Name: Jennifer Sokoloski

Abstract: In 2011, the recurrent nova T Pyx erupted for the first time in 45 years, providing the ideal opportunity to determine how the companion star influences, and is influenced by, a nearby nova. Because the ejecta from the 2011 explosion are now large enough and still X-ray bright enough to be detectable, we propose a 150-ks ACIS-S observation to image the young remnant. The orientation of extended X-ray emission with respect to morphological structures detected by HST provides a clear test of the influence of the companion star. Moreover, the X-ray emission from the central binary will reveal the affect of past novae on the accretion flow from the companion. This work has implications for fundamental aspects of novae, binary stellar evolution, and the progenitors of type Ia supernovae.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+09:04:41.50 -32:22:47.50 T Pyx ACIS-S None 150.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400006

Title: Hunting for discrete spectral features in the Rapid Burster

Type: GTO/TOO Total Time (ks): 80

PI Name: Jelle Kaastra

Abstract: We propose to carry out a 80ks HETGS observation of the low-mass X-ray binary MXB 1730-335. Our goal is to detect spectral features originating in the photosphere during type I bursts, which would allow to determine the gravitational redshift. The exceptionally short burst recurrence times shown by the source and the minor Doppler broadening of spectral features due to its likely slow rotation facilitate the detection. Furthermore, RXTE-PCA observations have shown ~30s dips due to an increased column density of the absorbing material during some type I bursts. If repeated with Chandra, such observations may diagnose the absorber in the circumstellar environment.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+17:33:24.60 -33:23:19.90 MXB 1730-335 ACIS-S HETG 80.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400093

Title: Is there an HLX in the Lyman-alpha Galaxy Haro 11?

Type: GO Total Time (ks): 75

PI Name: Andrea Prestwich

Abstract: Haro-11 is a famous compact dwarf galaxy undergoing an intense starburst. It is also an example of a Lyman-alpha emitting galaxy. We show that there is an extremely luminous (Lx~1E41 ergs/s) compact X-ray source located at the center of a bipolar Lyman alpha nebula. This source may be a Hyperluminous X-ray source. We ask for 3 monitoring observations of this source on a timescale of years to detect high amplitude variability which would indicate the presence of a HLX. The fact that the candidate HLX is associated with a Lyyman alpha nebula raises the exciting possibility that winds from the HLX (possibly an IMBH) play an important role in blowing away the neutral gas to allow the Lyman alpha to escape.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+00:36:52.70 -33:33:16.90 Haro 11 ACIS-S None 75.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400124

Title: CHANDRA TOOs FOR FERMI GALACTIC PLANE TRANSIENTS

Type: TOO Total Time (ks): 10

PI Name: Marco Ajello

Abstract: Fermi detected hundreds of transients with short (sec to hr) and long (months) variability timescales. However, so far no systematic search of transients on weekly timescales has been performed. The Fermi All-sky Variability Analysis (FAVA) allows us to systematically search all-sky for weekly transients. The novelty of FAVA resides in using the mission-long data to provide an estimate of the average sky intensity against which weekly data are compared. This makes FAVA an unbiased and fast tool to find transients in the Galactic plane where the diffuse emission is the brightest. FAVA detects 1 plane transient every 8 weeks. We propose to use Chandra to follow up on 2 new transients. The population of Galactic transients is under-sampled and detecting even 1 source will have a large impact

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
FAVA Transient 1 ACIS-I None 10.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400143

Title: INVESTIGATING NEW INTEGRAL SOURCES WITH Chandra

Type: TOO Total Time (ks): 20

Abstract: We propose to trigger a maximum of 2 Chandra fast (4-15 days) ToO observations on new sources discovered by INTEGRAL. We ask for 20 ksec per observation, using HETGS. The scientific aims are: 1) determine the source position with Chandra unique sub-arcsecond accuracy, which will allow our team to perform source identification and multi-wavelength follow-up observations, crucial in the crowded Galactic plane and center regions; 2) obtain the high resolution HETGS X-ray spectrum, free from pile-up distortions, crucial to determine the nature of the new source. We aim to continue our successful INTEGRAL-Chandra monitoring program begun in Chandra AO 5.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
New INTEGRAL source 1 ACIS-S HETG 20.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400153

Title: Transient LMXBs in Globular Clusters

Type: TOO Total Time (ks): 20

PI Name: David Pooley

Abstract: Since the discovery of globular cluster LMXBs in the 1970s, it was assumed that there was only one luminous LMXB per cluster. Deep Chandra observations of several globular clusters have revealed that they contain numerous quiescent LMXB systems, any of which could go into outburst. Our observations will determine the precise locations of new outbursts from transient LMXBs in globular clusters, enabling the important study of their quiescent counterparts.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
GC Transient 1 HRC-S None 10.0
GC Transient 2 HRC-S None 10.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400196

Title: Following a black hole X-ray transient through the transition into quiescence

Type: TOO Total Time (ks): 135

PI Name: Richard Plotkin

Abstract: There is increasing evidence that the quiescent state of black hole X-ray binaries (BHXBs) is different from the canonical hard state at higher luminosities. Quiescent BHXB X-ray spectra are generally softer, and it has recently been realized that not every system takes the same path through the radio/X-ray luminosity plane during the decay into quiescence. We request six simultaneous Chandra/VLA TOO observations to monitor a BHXB during an outburst decay between 3e-7--1e-4 L_Edd, a crucial luminosity regime that represents the transition into quiescence for many systems, but still has sparse data coverage. From these coordinated observations we will place new constraints on jet-dominated and radiatively inefficient accretion flow models.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
Fading BHXB (TOO) ACIS-S HETG 135.0
Fading BHXB (TOO) ACIS-S None None

Subject Category: BH AND NS BINARIES

Proposal Number: 16400255

Title: Glimpsing a Chandra Population of new X-ray Pulsators

Type: GO Total Time (ks): 40

PI Name: Gianluca Israel

Abstract: In the largest ever systematic search in soft X-rays for coherent periodicities [more than 400,000 light curves collected by the Swift X-Ray Telescope and the Chandra Advanced CCD Imaging Spectrometer] we have discovered so far about 35 new X-ray pulsators. In this proposal we ask for Chandra follow-ups for two of them, for which the discovery Chandra observations are covering only a few cycles of the detected signals and no further high energy archival data are available. The requested observations will allow us to: i) unveil their nature, ii) extending our understanding of the physics of accretion toward lower luminosities and iii) test magnetic gating accretion scenarios, a regime which has remained poorly explored so far.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+17:10:04.70 -32:12:07.00 CXOUJ171004.7 ACIS-S None 40.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400288

Title: Wind-Triggered Disk Wind Spectroscopy of GRS 1915+105

Type: TOO Total Time (ks): 80

PI Name: Jon Miller

Abstract: In soft spectral states, GRS 1915+105 launches a remarkable disk wind. This flow may carry away a substantial fraction of the accreting material, so it is critical to understand how it is launched and regulated. Using dedicated Swift/XRT observations that can detect strong Fe XXV and Fe XXVI absorption lines, we propose to trigger 3 new 40 ks Chandra/HETG observations of a strong wind phase in GRS 1915+105. We will study the duration and evolution of the outflow rate and kinetic power, and search for multiple components in the wind that may help to probe launching mechanisms.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+19:15:11.60 +10:56:44.80 GRS 1915+105 ACIS-S HETG 80.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400294

Title: The Ins and Outs of Disk Accetion in Black Hole Transient

Type: TOO Total Time (ks): 120

PI Name: Jon Miller

Abstract: Stellar-mass black holes are excellent laboratories in which to study the fundamental physics of disk accretion, radiative and mechanical feedback from black holes, and in which to explore the predictions of general relativity. In order to make progress on these fronts, and to better explore emerging connections between the disk, winds, and jets, we propose to observe a bright black hole transient (new, or previously known) in outburst on 3 occasions using the HETGS, for 40 ksec each time. Independent Swift and optical programs will support this proposal.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
Black Hole Transient ACIS-S HETG 120.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400301

Title: A Black Hole in the Galactic Globular Cluster M10

Type: GO Total Time (ks): 33

Abstract: As part of our deep radio continuum survey of Milky Way globular clusters, we have discovered a new radio-selected candidate stellar-mass black hole binary in the cluster M10. We request 33 ksec of Chandra imaging to determine whether this source has an X-ray counterpart consistent with that expected for a quiescent stellar-mass black hole.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+16:57:09.00 -04:06:01.10 M10 ACIS-S None 33.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400324

Title: X-Ray Jets in Microquasars

Type: TOO Total Time (ks): 150

PI Name: Stephane Corbel

Abstract: We propose Target of Opportunity (ToO) observations for detailed studies of X-ray jets from microquasars. We describe our discovery of radio/X-ray jets in three microquasars, why X-ray jets are probably much more common than previously thought, and transient X-ray jets offer an exciting new way to probe the physics of relativistic jets from black holes. The proposed ToO observations are optimized to discover and study (flux evolution, morphology, SED, proper motion, ...) of new X-ray jets from microquasars, triggered by their detection as radio lobes. This will have implications not only for the study of jets from Galactic X-ray binaries, but also for our understanding of relativistic jets from active galactic nuclei (AGN).

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
X-ray Jets ACIS-S None 150.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400332

Title: A STUDY OF THE RELATIVISTIC JET OF 4U1630-47

Type: TOO Total Time (ks): 100

PI Name: Maria Diaz Trigo

Abstract: We propose one 100ks observation of the high inclination black hole (BH) low mass X-ray binary (LMXB) 4U1630-47 in a very high state of accretion. We will attempt to confirm the presence of the narrow emission features observed in a recent XMM spectrum of the source that we interpreted as Doppler-shifted lines from a relativistic, bipolar jet. Chandra/HETGS spectra have proven invaluable to study the jet in the supercritical accreting source SS 433. The detection of such features in a canonical BH LMXB transient opens a new window for the understanding of jets and launching mechanisms via the detection of baryons, and precise measurements of speed and opening angle of the jet. The simultaneous radio observation will prove if the X-ray lines, should they be detected, originate in a jet.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+16:34:01.60 -47:23:34.00 4U 1630-47 ACIS-S HETG 100.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400369

Title: Chandra ToO observations of Gaia-discovered tidal disruption events

Type: TOO Total Time (ks): 200

PI Name: Peter Jonker

Abstract: The Gaia satellite is predicted to discover more than 100 Tidal Disruption Events per year. A small fraction should have X-ray emission bright enough to allow detailed Chandra follow-up observations. These observations can be compared with the theoretical predictions for the outflows and presence of absorption lines and edges. Tidal disruption events are also our only way to determine black hole properties of otherwise dormant black holes in galaxies beyond a few local galaxies.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+00:00:00.00 +00:00:00.00 Gaia-TDE-imbh ACIS-S None 200.0
+00:00:00.00 +00:00:00.00 Gaia-TDE-imbh ACIS-S None None

Subject Category: BH AND NS BINARIES

Proposal Number: 16400393

Title: Narrow Lines from a Slowly Rotating Neutron Star

Type: TOO Total Time (ks): 150

PI Name: Deepto Chakrabarty

Abstract: The detection and identification of photospheric absorption lines from a neutron star would allow measurement of its gravitational redshift and hence the neutron star compactness. In principle, the line shape allows unique determination of mass and radius separately. X-ray bursters are, in most respects, the ideal targets for this search, but most rotate so rapidly that any lines are too broadened to detect. However, the recently discovered X-ray burster Terzan 5 X-2 spins at only 11 Hz, 20 times slower than the next slowest rotator. We propose a TOO observation with HETGS to search for narrow lines of ionized Fe when this X-ray transient next becomes active. This is the best chance ever to detect a narrow atomic line in a neutron star.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+17:48:04.80 -24:46:48.80 IGR J17480-2446 ACIS-S HETG 150.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400423

Title: Crust cooling of accretion-heated neutron stars

Type: TOO Total Time (ks): 150

PI Name: Rudy Wijnands

Abstract: We propose to continue our successful program to use the observed cooling of the crusts in accreting neutron star systems to probe the properties of ultra-dense matter. Those crusts are heated due to the accretion of matter onto neutron stars during the X-ray outburst and after the outbursts are over the crusts should cool down until they are in equilibrium with the core again. Following this cooling processes in several systems has already given us new insights in the structure of neutron stars (i.e., the crust but also the core and hence in ultra dense matter), but many uncertainties remain. Therefore it is needed to enlarge our sample of well studied sources to obtain better insights in the behavior of how neutron stars react to the accretion of matter.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
Quiescent source ACIS-S None 150.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400444

Title: Precise Localization of Transient Low-Mass X-ray Binaries

Type: TOO Total Time (ks): 4

PI Name: Deepto Chakrabarty

Abstract: We propose to observe up to four neutron star or black hole transients in outburst to obtain accurate source positions, continuing a successful multi-year and multiwavelength program in place since Cycle 6. These positions and their prompt dissemination will allow re-observation of these sources in the X-ray, optical, IR, and radio bands in order to study their quiescent emission and to enable detailed follow-up (e.g., orbital radial velocity spectroscopy). This program will increase the number of accurately-positioned X-ray transients, providing a more uniform sample for future studies. We will only trigger our program for sources in crowded or highly obscured fields where a position from another mission (e.g., Swift) is insufficiently precise.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
X-ray transient 1 ACIS-S None 1.0
X-ray transient 2 ACIS-S None 1.0
X-ray transient 3 ACIS-S None 1.0
X-ray transient 4 ACIS-S None 1.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400466

Title: Following the Ultra-Fast Winds in the Stellar-Mass Black Hole, IGR 17091-3624

Type: TOO Total Time (ks): 80

PI Name: Ashley King

Abstract: IGR J17091-3624 is the first stellar-mass black hole candidate to show evidence for ultra-fast winds, v/c=0.03. We propose a triggered campaign that will follow IGR J17091-3625 throughout a new outburst, tracking the evolution of its ultra-fast wind. Understanding the strength, ionization, velocity structure, variability and ultimately, the duty cycle of this ultra-fast wind is the key to understanding the disk-wind-jet connection in this source, and potentially in super-massive black holes. We propose a triggered campaign of IGR J17091$-$3624 with 4$\times$ 40 ksec observations spaced 30 days apart.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+17:09:07.60 -36:24:24.90 IGR J17091-3624 ACIS-S HETG 80.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400507

Title: Crustal cooling from KS 1731-260 14 years into quiescence

Type: GO Total Time (ks): 150

PI Name: Edward Cackett

Abstract: The cooling of accretion-heated neutron star crusts after a return to quiescence provides a rare opportunity to investigate neutron star structure. The first source where crustal cooling was observed is KS 1731-260, which has been in quiescence since 2001. Our successful long-term Chandra monitoring of this source has shown that the crust must have a high thermal conductivity - the first constraint of this kind. However, several other crustal cooling sources have recently shown unexpected behavior in their cooling curves at late times. Here we are proposing a 150 ks observation of KS 1731-260 to determine the state of the crust 14 years into quiescence, allowing us to constrain the crust thickness (and hence surface gravity) and core temperature.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+17:34:13.50 -26:05:18.60 KS 1731-260 ACIS-S None 150.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400537

Title: Filling the gap in understanding the wind structure of HDE 226868 /Cyg X-1

Type: TOO Total Time (ks): 24

PI Name: Victoria Grinberg

Abstract: We propose to observe the BH HMXB system HDE 226868 /Cyg X-1 as a ToO with Chandra-HETGS for 24 ks (corresponding to Delta phi=0.05 in orbital phase) between orbital phases phi=0.25 and phi =0.4. The spectroscopic analysis of the highly photoionized wind during this phase will improve our understanding of the wind, its implications for the accretion flow onto the black hole, and also of the conditions necessary for the formation of a narrow Fe K fluorescence line. In addition, during this phase dipping, which is very prominent at phi~=0, is expected to cease. The morphology and spectral signatures of the very last observed dips will constrain the location and kinematics of the wind structures responsible for these absorption events.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+19:58:21.70 +35:12:05.80 Cyg X-1 ACIS-S HETG 24.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400546

Title: The nature of the transient X-ray binary Swift J1910.2-0546

Type: GO Total Time (ks): 45

PI Name: Nathalie Degenaar

Abstract: Swift J1910.2-0546 is a newly discovered transient X-ray binary that exhibited a ~1 yr long outburst in 2012-2013. Owing to its low hydrogen column density and fair proximity, it is one of the few sources for which X-ray/UV quiescent studies are feasible. This provides the opportunity to verify the nature of the compact primary (black hole versus neutron star), and to investigate the properties of the quiescent accretion flow. Such a study would provide an important perspective to understand the intriguing outburst phenomena observed for this source. To this end, we request a 45 ks Chandra/ACIS-S observation and 2 orbits of HST/WFC3-UVIS time for Swift J1910.2-0546.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+19:10:22.80 -05:47:46.30 Swift J1910.2-0546 ACIS-S None 45.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400552

Title: Looking for evidence of a pulsar wind nebula or a gamma-ray binary associated with the TeV source HESS J1832-093

Type: GO Total Time (ks): 20

PI Name: Helene Laffon

Abstract: The newly discovered TeV source HESS J1832-093 observed on the rim of SNR G22.7-0.2 remains unidentified despite extensive multi-wavelength study. XMM-Newton observations allowed the discovery of a hard point-like source as a potential counterpart but its nature could not be confirmed. A compelling IR counterpart to the X-ray source is found in the 2MASS catalog. The origin of the TeV emission could stem from a pulsar wind nebula or a new gamma-ray binary. The very good Chandra angular resolution could probe for smaller source extensions and therefore detect an extended X-ray nebula which would confirm the PWN scenario. On the other hand, Chandra could measure the X-ray source localization very accurately and determine the association with the 2MASS source, favoring the binary possibility.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+18:32:45.00 -09:21:53.90 XMMU J183245-0921539 ACIS-I None 20.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400577

Title: An Integrated Approach to Winds, Jets, and State Transitions

Type: TOO Total Time (ks): 120

PI Name: Joseph Neilsen

Abstract: We propose a large multiwavelength campaign (120 ks Chandra HETGS, NuSTAR, INTEGRAL, JVLA/ATCA, Swift) on a black hole transient to study the influence of ionized winds on relativistic jets and state transitions. With a reimagined observing strategy based on new results on integrated RMS variability and a decade of radio/X-ray monitoring, we will search for winds before the state transition to test their influence on and track their coevolution with the disk and the jet over the next ~2 months.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
Black Hole Transient ACIS-S HETG 120.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400639

Title: The short-orbital-period black-hole X-ray binary Swift J1753.5-0127 in quiescence

Type: TOO Total Time (ks): 32

PI Name: Jeroen Homan

Abstract: We propose a Chandra observation of Swift J1753.5-0127 (J1753), one of the shortest-orbital-period black-hole LMXBs. Observing this source in quiescence allows us to test whether there exists a minimum luminosity for quiescent BH LMXBs, as predicted by binary-evolution theory and hinted at by recent observations of two other short-orbital-period BH LMXBs. This observation is also relevant for the comparison between quiescent neutron star and BH LMXBs, since the orbital period of J1753 falls in a range that is still sparsely populated by BHs; such a comparison can provide further insight into the differences between the radiatively inefficient flows in both types of systems. For a distance of 4 kpc we will be able to detect J1753 down to a luminosity of ~3e30 erg/s in 32 ks with ACIS-S.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+17:53:28.30 -01:27:06.20 Swift J1753.5-0127 ACIS-S None 32.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400764

Title: X-RAYS FROM GREEN PEA ANALOGS

Type: GO Total Time (ks): 70

PI Name: Matthew Brorby

Abstract: X-rays may have contributed to the heating and reionization of the IGM in the early universe. High mass X-ray binaries (HMXB) within small, low-metallicity galaxies are expected to be the main source of X-rays at this time. Since studying these high-redshift galaxies is currently impossible, we turn to local analogs that have the same properties the galaxies in the early are expected to have. A number of recent studies have shown an enhanced number of HMXBs in nearby low metallicity galaxies. We propose to observe a sample of metal-deficient luminous compact galaxies (LCG) in order to determine if the X-ray luminosity is enhanced relative to SFR, thereby providing further evidence to the importance of X-rays in the early universe.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+14:48:05.30 -01:10:57.70 SHOC 486 ACIS-S None 24.0
+08:42:20.90 +11:50:00.20 SDSS J084220.94+115000.3 ACIS-S None 46.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400845

Title: Ultraluminous X-rays from the historical supernova 1986L: Testing stellar mass black hole scenario for the ULX origin

Type: GO Total Time (ks): 46

PI Name: Kwan Lok Li

Abstract: The Type II-L SN 1986L was first discovered in X-ray through serendipitous Swift observations taken in 2005 and 2007 with a luminosity of 1.6*10^40 erg/s which is reminiscent of ULX that could either be an IMBH or a stellar mass black hole at (super-)Eddington accretion. While Type II-L SNe are suggested to explode in binary, we suspect that a stellar mass black hole remnant created by fallback forming an X-ray binary with the progenitor's companion to produce the ULX. As the positional accuracy of Swift prevents a solid identification, a deep Chandra observation is required to confirm the SN-ULX association. If confirmed, SN 1986L will be the first ULX detected in a young SNR, which favors the stellar mass black hole scenario.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+04:17:29.40 -62:47:04.00 SN 1986L ACIS-S None 46.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400852

Title: Constraining Neutron Star Properties with Chandra Observations of Millisecond Pulsars

Type: GO Total Time (ks): 100

PI Name: Tod Strohmayer

Abstract: Neutron star observables influenced by r-mode physics, such as their spin and thermal evolution, can provide a unique window on their exotic interiors. We propose ACIS-S observations of four non-accreting millisecond pulsars (PSRs J1640+2224, J2019_2425, J1709+2313 and J1923+2515) with low inferred magnetic fields in order to constrain their neutron star surface temperatures, obtain limits on the amplitude of unstable r-modes in them, and make comparisons with similar limits obtained for a sample of accreting LMXB neutron stars. Perhaps surprisingly, none of our proposed targets is yet detected in the X-ray band. Our observations will provide the first X-ray detections of these objects, and will enable further exploration of the r-mode instability in neutron stars.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+16:40:16.70 +22:24:08.90 PSR J1640+2224 ACIS-S None 40.0
+17:09:05.80 +23:13:27.80 PSR J1709+2313 ACIS-S None 60.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400865

Title: Spying on millisecond pulsar paradise: Chandra+GBT monitoring of M28

Type: GO Total Time (ks): 90

PI Name: Manuel Linares

Abstract: We propose a coordinated Chandra and GBT program to monitor the millisecond pulsar population in the globular cluster M28, with a special focus on the unique transitional pulsar discovered last year. This unprecedented multi-wavelength campaign on a carefully selected cluster will bring us closer to understand how recycled pulsars are formed and how they interact with their surroundings.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+18:24:32.90 -24:52:11.40 M28 ACIS-S None 90.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400867

Title: What is the Orbital Period of the Hierarchical Triple Candidate 4U 2129+47?

Type: GO Total Time (ks): 20

PI Name: MIke Nowak

Abstract: We propose to observe the neutron star system 4U 2129+47 whose X-ray and optical lightcurves show a modulation of around 5.2 hr. This is associated to orbital motion around an optical companion which, additionally, eclipses the X-ray source once every orbital period. We have found growing evidence that the system is indeed a hierarchical triple as we are able to fit the eclipse times with a model including the Doppler shift caused by the hypothetic third body. With the available data we can decrease the number of possible orbit solutions to two. Thus, we ask to observe 4U 2129+47 with Chandra again once during a specific date range for 22 ksec, specifically where the two possible orbital solutions differ most. This data will tell us immediately which orbital solution is correct.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+21:31:26.20 +47:17:24.00 4U 2129+47 ACIS-S None 20.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400877

Title: Broadband X-ray Observations of a High-State from the Hyper-luminous X-ray Source M82 X-1

Type: TOO Total Time (ks): 100

PI Name: Dominic Walton

Abstract: Broadband X-ray spectroscopy of ultraluminous X-ray sources (ULXs) has begun to provide important information regarding the nature of these enigmatic sources. By far the most intriguing results come from cases where we have multi-epoch observations of sources that exhibit strong flux and spectral variability. We propose to undertake a 100 ks Chandra + NuSTAR ToO of the hyperluminous X-ray source M82 X-1 (L[X, peak] ~ 1e41 erg/s) in a high-flux state, in order to complement our existing broadband observations of M82 X-1 in a low state and investigate any spectral variability associated with this transition. Our planned use of the Chandra gratings will also allow us to place stringent constraints for the first time on the presence of any massive outflows launched by M82 X-1 in this state.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+09:55:50.20 +69:40:47.00 M82 X-1 ACIS-S HETG 100.0

Subject Category: BH AND NS BINARIES

Proposal Number: 16400905

Title: Accretion/ejection coupling in the first Be/BH system

Type: GO Total Time (ks): 60

PI Name: Marc Ribo

Abstract: We propose to conduct deep joint Chandra and VLA observations of the recently discovered first Be/BH system to reach the following goals: 1) Obtain an accurate position of the source; 2) Determine its X-ray spectrum; 3) Search for X-ray flux variability; 4) Unveil the accretion/ejection coupling in HMXBs in quiescence.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+22:42:57.30 +44:43:18.30 MWC 656 ACIS-S None 60.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500009

Title: The possible PWN candidate in the LMC SNR [HP99] 456

Type: GO Total Time (ks): 50

PI Name: Manami Sasaki

Abstract: The Large Magellanic Cloud (LMC) offers the ideal laboratory for the study of a large sample of supernova remnants (SNRs). The source [HP99] 456 was one of the promising SNR candidates discovered in the ROSAT survey of the LMC. A new observation of this source with XMM-Newton revealed a complex morphology, composed of a thermal circular shell and a non-thermal hard emission. X-ray and radio data suggest the identification of the hard source as a pulsar wind nebula (PWN), with a peculiar morphology in X-rays. Higher spatial resolution is required to resolve the hard X-ray emission and determine the correct radio counterpart. We therefore propose a high-resolution observation of the hard source with Chandra ACIS-S.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+05:41:38.90 -66:58:48.00 [HP99] 456 ACIS-S None 50.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500090

Title: Rapid Observations of Short-Duration Gamma-Ray Bursts: Accurate Positions Hold the Key to the Progenitor Population

Type: TOO Total Time (ks): 20

PI Name: Edo Berger

Abstract: Only 1/4 of all short GRBs are localized to sub-arcsecond accuracy, required for unambiguous host and redshift identifications, determination of the burst environment (disk, bulge, halo, IGM), and assessment of natal kicks. These properties determine the identity and ages of the progenitors, and the GRB explosion physics. Thus, much of our knowledge depends on a handful of events, which are moreover biased to high density environments by virtue of optical/radio detections. Here we propose to double the fraction of events with sub-arcsecond positions, and overcome the density bias, using rapid Chandra observations of bursts with only Swift/XRT positions. Swift data will guarantee Chandra detections at <4 days, and follow-up work will delineate the burst/host properties.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
Short-GRB-Astrometry-1 ACIS-S None 20.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500118

Title: CHANDRA CYCLE 16 SPATIAL AND SPECTRAL MONITORING OF SN 1987A

Type: GO Total Time (ks): 140

PI Name: David Burrows

Abstract: Regular monitoring of SN 1987A, the only supernova remnant in which we can study the early developmental stages in detail, is critical to testing models of remnant evolution, nonequilibrium ionization processes, thin plasma spectra, and physical processes in dusty plasmas. SN 1987A presents a unique opportunity to observe the birth and early evolution of a supernova remnant at high spatial and spectral resolution for the first time. We propose to continue our program of monitoring SN 1987A at roughly six month intervals in Cycle 16.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+05:35:28.00 -69:16:11.10 SN 1987A ACIS-S HETG 70.0
+05:35:28.00 -69:16:11.10 SN 1987A HRC-S LETG 70.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500129

Title: G141.2+5.0: An Unusual New Pulsar-Wind Nebula

Type: GO Total Time (ks): 50

PI Name: Stephen Reynolds

Abstract: Pulsar-wind nebulae (PWNe) showcase the winds emitted by pulsars and the processes by which particles are accelerated in relativistic shock waves. Many older PWNe have been discovered recently in gamma rays, but a persistent puzzle, pointing to our fundamental lack of understanding of particle energization in PWNe, concerns the relation of radio emission to X and gamma-ray emission. We propose to observe a recently discovered radio PWN, the first such in 17 years, which has a steep radio spectrum but otherwise the standard properties of radio PWNe. We plan to search for a point source; characterize any X-ray nebula; and compare G141.2+5.0 to the small group of steep-spectrum radio PWNe to try to elucidate the radio-to-X-ray connection in PWNe in general.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+03:37:15.00 -61:52:60.00 G141.2+5.0 ACIS-S None 50.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500168

Title: High angular resolution study of the mode-switching PSR B0943+10

Type: GO Total Time (ks): 50

PI Name: SANDRO MEREGHETTI

Abstract: Recent observations unvealed a remarkable and unique behaviour in the X-ray emission of the mode-switching radio pulsar PSR B0943+10. Its X-ray flux varies in correlation with the mode of radio emission and the spectrum requires the combination of thermal and non-thermal components with different variability properties. Part of the observed X-ray emission could originate from a pulsar wind nebula, but no high angular resolution observations of this pulsar have been obtained so far. Assessing the presence of diffuse emission with Chandra is essential in order to correctly disentangle the X-ray emission components of PSR B0943+10 and to understand how they relate with changes in the magnetosphere geometry and with the different modes of its pulsed radio emission.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+09:46:07.70 +09:52:00.80 PSR B0943+10 ACIS-S None 50.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500197

Title: Changes in Latitude: A Chandra Study of G296.5+10.0

Type: GO Total Time (ks): 100

PI Name: Patrick Slane

Abstract: G296.5+10.0 is a supernova remnant at high Galactic latitude, with a distinctive bilateral morphology. Faraday rotation measurements provide evidence for a toroidal magnetic field component that may have been produced in a magnetic wind from the progenitor star. Gamma-ray observations indicate that the remnant has been an efficient particle accelerator. We propose Chandra observations of the remnant to search for evidence of the expected wind composition and density profile, and to determine the nature and spatial distribution of a hard spectral component. We will also investigate an apparent interaction with a small molecular cloud and search for X-ray emission corresponding to observed filamentary structure in the radio.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+12:12:02.00 -52:42:37.00 G296.5+10.0 - SE ACIS-I None 40.0
+12:07:13.00 -52:52:12.00 G296.5+10.0 - SW ACIS-I None 60.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500286

Title: The Energetic Magnetar in HESS J1713-381/CTB 37B

Type: GO Total Time (ks): 40

PI Name: Jules Halpern

Abstract: The spin-down power of the 3.82 s AXP in the SNR CTB 37B is among the largest of magnetars, and it may be the youngest one as well. We propose to continue to monitor its spin-down rate, which varies by a factor of 2. Magnetars with the largest spin-down power are SGRs, and a marked increase in their spin-down torque often precedes an outburst. In this regard, CXOU J171405.7-381031 is very similar to SGR/AXP 1E 1547.0-5408, the magnetar with the largest spin-down power. By analogy with 1E 1547.0-5408, we may be observing the behavior of an SGR before its outburst. The pulse profiles show a change in shape above 8 keV, which suggests that a separate high-energy spectral component is present. We will examine the high-energy spectrum and pulse with NuSTAR.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+17:14:05.70 -38:10:30.90 CXOU J171405.7-381031 ACIS-S None 20.0
+17:14:05.70 -38:10:30.90 CXOU J171405.7-381031 ACIS-S None 20.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500341

Title: Measuring magnetar distance from the dust echo of a bright burst

Type: TOO Total Time (ks): 70

PI Name: Andrea Tiengo

Abstract: In 2009 we discovered, around the magnetar 1E1547.0-5408, 3 bright X-ray expanding rings due to scattering of the radiation of a strong burst by 3 dust layers in our Galaxy. We propose rapid follow-up observations with Chandra in the case that a similar phenomenon will occur again in a magnetar. This would provide the first high resolution two-dimensional images of an X-ray expanding ring around an astrophysical object and constrain the source distance and energetics of the emission producing the dust echo. Moreover, the time evolution of the ring intensity and spectrum, depending on the dust grains composition and size, is a powerful tool to test the different interstellar dust models. Previous versions of this proposal were accepted (but never triggered) in Cycle 12, 13, 14, and 15.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
Magnetar scattering halo ACIS-I None 70.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500362

Title: Revealing the nature of the Central Compact Object candidate CXOU J181852.0-150213

Type: GO Total Time (ks): 90

PI Name: Dmitry Klochkov

Abstract: Central Compact Objects (CCOs) are low-magnetized cooling NSs. CCOs potentially provide an "undisturbed" view of the NS surface emission giving an access to their mass and radius. Despite their importance, only a dozen of CCOs are known. Thus, any addition to this small sample is highly valuable. We propose to observe a recently discovered CCO candidate with 90 ks. Due to the small angular size of the surrounding SNR, Chandra is the only instrument having sufficient angular resolution for the proposed analysis. We demonstrate that the new data will allow a confirmation/rejection of the CCO hypothesis and association with the SNR. If the CCO hypothesis is confirmed, we will use our atmosphere models to constrain the NS mass and radius.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+18:18:52.10 -15:02:13.90 CXOU J181852.0-150213 ACIS-I None 90.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500414

Title: Investigating the nature of AX J1714.1-3912

Type: GO Total Time (ks): 10

PI Name: Marco Miceli

Abstract: Molecular clouds are predicted to emit non-thermal X-rays when they are close to particle-accelerating SNRs, but this emission has not been confirmed yet. We propose to observe the non-thermal X-ray source AX J1714.1-3912 to investigate its relationship with the nearby SNR RX J1713.7-3946. ASCA and Suzaku observations show that the spectrum of this source may be associated with extremely energetic particles accelerated in the SNR and diffusing in a nearby molecular cloud. This emission has never been observed in other SNRs. However, the association of the source with the remnant is still controversial and the available data cannot rule out a possible association with an AGN or an SFXT. We aim at verifying whether AX J1714.1-3912 is indeed an extended source to understand its nature.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+17:13:42.80 -39:12:15.40 AX J1714.1-3912 ACIS-I None 10.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500418

Title: Mapping the Zoo of engine driven explosions with late-time X-rays

Type: TOO Total Time (ks): 50

PI Name: Raffaella Margutti

Abstract: We propose an in-depth study of a nearby long gamma-ray burst (GRB, z < 0.3) with Chandra. Our synergistic multi-wavelength effort (radio, optical, Swift/XRT and proposed Chandra) is designed to extract the true energy of these explosions and to reveal the activity of their central engines. This effort allows us to: (i) investigate whether sub-energetic GRBs share the same explosion mechanisms and central engines as ordinary GRBs; (ii) investigate what essential physical property enables only a small fraction of supernovae to harbor a relativistic outflow; (iii) understand if jet-driven explosions are common in all supernovae. These objectives are only possible by expanding the current small sample of local GRBs and by drawing comparisons with cosmological GRBs and ordinary SNe.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
GRB1 ACIS-S None 50.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500454

Title: Revisiting Vela shrapnel D: Understanding the dynamics of the SNR ejecta interaction with an interstellar cloud

Type: GO Total Time (ks): 30

PI Name: Fumiyoshi Kamitsukasa

Abstract: We propose to perform the second-epoch observation of Vela shrapnel D, a bullet of supernova ejecta overrunning the shock front of the Vela supernova remnant, to measure its proper motion. The shrapnel D is considered to be interacting with an interstellar cloud, which leads to the optical nebula, RCW 37. The shock velocity with the optical nebula is estimated as 100-200 km/s by the far-ultraviolet studies. The shock of the shrapnel D is, however, estimated to be as fast as ~ 500 km/s from both the electron temperature and the bow shock shape in X-rays. The key to understand this discrepancy is the proper motion in X-rays, which can be measured only with Chandra. We request one pointing observation with an exposure time of 30 ks.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+09:00:07.80 -45:50:42.70 Vela Shrapnel D revisit ACIS-I None 30.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500486

Title: HESS~J1640-465: Powering the most luminous gamma-ray source in the Galaxy

Type: GO Total Time (ks): 160

PI Name: Eric Gotthelf

Abstract: HESS 1640-465 is most luminous TeV source in the Galaxy and possibly the most efficient cosmic accelerator, yet the origin of its gamma-ray emission is uncertain. It lies near the center of the radio SNR G338.3-0.0, associated with hard Fermi emission, and is adjacent to a large HII region. Within the SNR resides a bright PWN powered by the newly discovered energetic pulsar PSR J1640-4631. The origin of the gamma-ray emission is difficult to discern, given the complex local environment, both leptonic and hadronic models for the emission mechanism have been argued. With the pulsar properties now in hand, we propose a deep Chandra observation of the PWN/SNR to help model its contribution to the broad-band spectrum of HESS J1640-65 and determine the origin of the gamma-rays in the region.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+16:40:43.50 -46:31:35.00 CXOU J164043.5-463135 ACIS-I None 160.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500511

Title: Target-of-Opportunity Chandra Observations of Glitching High-B Radio Pulsars: Searching for Magnetar Metamorphoses

Type: TOO Total Time (ks): 1680

PI Name: Victoria Kaspi

Abstract: In 2006, observations of a high-magnetic-field rotation-powered pulsar (RPP) fortuitously caught a sudden transformation: we observed a "magnetar metamorphosis" simultaneous with a rotation glitch. The RPP's X-ray flux increased by a factor of 10, its spectrum changed dramatically, and it emitted magnetar-like X-ray bursts. After <8 weeks, it returned to its normal state. This amazing event, caught serendipitously, suggests that all high-magnetic-field RPPs may undergo transient metamorphoses at glitch epochs, but have not been so recognized because of the absence of a sensitive X-ray all-sky monitor. We therefore request Chandra ToO observations of one high-magnetic-field RPP when it has a large glitch or X-ray burst in order to test this hypothesis.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+01:57:49.90 +62:12:25.90 PSR B0154+61 ACIS-S None 105.0
+07:26:08.10 -26:12:38.10 PSR J0726-2612 ACIS-S None 105.0
+08:47:57.00 -43:16:57.20 PSR J0847-4316 ACIS-S None 105.0
+11:19:14.30 -61:27:49.50 PSR J1119-6127 ACIS-S None 105.0
+16:32:39.70 -48:18:52.60 PSR J1632-4818 ACIS-S None 105.0
+17:18:10.00 -37:18:53.00 PSR J1718-3718 ACIS-S None 105.0
+17:26:07.50 -35:29:58.00 PSR J1726-3530 ACIS-S None 105.0
+17:34:26.60 -33:33:22.00 PSR J1734-3333 ACIS-S None 105.0
+17:40:33.80 -30:15:43.50 PSR B1737-30 ACIS-S None 105.0
+18:14:43.10 -17:44:48.00 PSR J1814-1744 ACIS-S None 105.0
+18:19:33.80 -14:58:01.00 PSR J1819-1458 ACIS-S None 105.0
+18:21:34.30 -14:19:26.00 PSR 1821-1419 ACIS-S None 105.0
+18:47:35.20 -01:30:46.00 PSR J1847-0130 ACIS-S None 105.0
+19:13:50.80 +04:46:06.00 PSR J1913+0446 ACIS-S None 105.0
+19:18:23.60 +14:45:06.00 PSR B1916+14 ACIS-S None 105.0
New High-B pulsar ACIS-S None 105.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500533

Title: CHARACTERIZING A NEW RADIO FAINT SNR: G309.4-0.1

Type: GO Total Time (ks): 20

PI Name: Mark Reynolds

Abstract: We request a 20 ks observation of a new SNR, discovered during the Swift Galactic plane survey, with Chandra/ACIS-S3. This source has the lowest radio flux measured for a Galactic SNR to date, and would begin to probe the X-ray properties of the low radio flux distribution of Galactic SNRs, which have remained undiscovered at X-ray energies to date. The proposed observation will use the exquisite imaging capabilities of Chandra to provide constraints on the morphology, abundances and progenitor of this intriguing source.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+13:47:45.70 -62:14:11.00 G309.4-0.1 ACIS-S None 20.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500534

Title: Energetics and Environment of Hydrogen-poor Core-Collapse SNe

Type: TOO Total Time (ks): 10

PI Name: Raffaella Margutti

Abstract: Envelope-stripped, core-collapse SNe (i.e. Type Ibc SNe) were recognized as a distinct flavor of core-collapse explosions 25 years ago. SNe Ibc have only recently enjoyed a surge of interest thanks to their association with Gamma-Ray Bursts (GRBs). The peculiar circumstances that enable a small fraction of SNe Ibc to launch a relativistic jet are not understood. Along the same line, the progenitors of SNe Ibc and their relation to those of GRBs have yet to be observationally identified. Here we propose a modest Chandra-VLA program to enable progress. The primary goals are to (i) populate the gap between ordinary type Ibc SNe and GRBs and (ii) to probe the diversity of the environment of ordinary SNe arising from envelope-stripped progenitors.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
SN1 ACIS-S None 10.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500556

Title: The puzzling dynamic nebula powered by the pulsar B1259-63 in a high-mass binary

Type: GO Total Time (ks): 130

PI Name: George Pavlov

Abstract: PSR B1259-63/LS 2883 is the famous eccentric gamma-ray binary (Pbin=3.4 yr, e=0.87) in which a pulsar orbits a massive O-type star. Its X-ray emission is produced by colliding winds of the pulsar and the massive companion. Using ACIS observations, we discovered an extended structure apparently moving away from the binary with v = 0.05-0.1 c. Such a moving X-ray nebula has never been seen before. To understand the nature of the dynamic nebula, the extended emission must be monitored throughout the binary orbit. As a first step in the monitoring program, we propose 2 ACIS observations to examine repeatability of the extended emission in different binary cycles and study the properties of the colliding winds and the emitting material.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+13:02:47.60 -63:50:08.70 PSR B1259-63 ACIS-I None 65.0
+13:02:47.60 -63:50:08.70 PSR B1259-63 ACIS-I None 65.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500634

Title: Snap-shot survey of unidentified Fermi sources

Type: GO Total Time (ks): 50

PI Name: Blagoy Rangelov

Abstract: We propose a mini-survey of unclassified Fermi sources from the 2FGL catalog. Using an intelligent parameter selection, we have identified a sub-sample that is likely to be dominated by pulsars with a possible inclusion of HMXBs. We aim to identify 5 new gamma-ray pulsars and their X-ray counterparts, and thus increase the population of pulsars detected in both gamma-rays and X-rays. The existing limited data hint at an intriguing change in the slope of the L(Edot) dependence at log(Edot)=35-36 erg/s. By identifying more pulsars in both gamma- and X-rays, we will be able to confirm the existence of those breaks and investigate their origin. We will also identify new X-ray bright pulsars suitable for detailed study using the prudent snap-shot approach.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+08:58:20.20 -43:33:34.60 2FGL J0858.3-4333 ACIS-I None 10.0
+08:42:57.90 -47:21:53.30 2FGL J0842.9-4721 ACIS-I None 10.0
+18:39:03.50 -01:02:07.00 2FGL J1839.0-0102 ACIS-I None 10.0
+10:56:00.50 -58:53:16.80 2FGL J1056.0-5853 ACIS-I None 10.0
+03:40:35.90 +53:07:52.90 2FGL J0340.5+5307 ACIS-I None 10.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500640

Title: PROMPT STUDY OF MAGNETAR OUTBURSTS WITH CHANDRA

Type: TOO Total Time (ks): 2465

PI Name: Nanda Rea

Abstract: The discovery of transient magnetars has opened a new perspective in the field confirming that a relatively large number of members of this class has not been discovered yet, and suggesting that others would manifest themselves in the future through outbursts. This proposal is aimed at gathering new insights on the physics of magnetars through the study of their outbursts. In particular, we are asking for 85ks of Chandra time divided in 4 observations throughout the outburst from a known or still unknown magnetar candidate.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+00:00:00.00 +00:00:00.00 NEWMAGNETAR ACIS-S None 85.0
+18:09:51.10 -19:43:51.70 XTE J1810-197 ACIS-S None 85.0
+01:00:43.10 -72:11:34.00 CXOUJ0100-7211 ACIS-S None 85.0
+01:46:22.40 +61:45:03.30 4U0142+614 ACIS-S None 85.0
+10:50:07.10 -59:53:21.40 1E1048.1-5937 ACIS-S None 85.0
+17:08:46.00 -40:08:53.00 RXSJ170849-400910 ACIS-S None 85.0
+18:41:19.40 -04:56:10.90 1E1841-04 ACIS-S None 85.0
+18:44:54.70 -02:56:53.40 AXJ1844-0256 ACIS-S None 85.0
+20:13:52.80 +34:19:55.20 SGR 2013+34 ACIS-S None 85.0
+23:01:08.30 +58:52:44.50 1E 2259+584 ACIS-S None 85.0
+19:07:14.30 +09:19:20.10 SGR 1900+14 ACIS-S None 85.0
+16:35:51.80 -47:35:23.30 SGR 1627-41 ACIS-S None 85.0
+18:08:39.30 -20:24:39.50 SGR 1806-20 ACIS-S None 85.0
+05:26:00.90 -66:04:36.30 SGR 0526-66 ACIS-S None 85.0
+05:01:06.20 +45:16:35.00 SGR 0501+4516 ACIS-S None 85.0
+15:50:55.30 -54:19:02.00 1E 1547.0-5408 ACIS-S None 85.0
+18:46:24.50 -02:58:28.00 PSR J1846-0258 ACIS-S None 85.0
+04:18:33.90 +57:32:22.90 SGR 0418+4729 ACIS-S None 85.0
+18:33:44.40 -08:31:07.70 SGR 1833-0832 ACIS-S None 85.0
+16:22:44.80 -49:50:54.40 PSR 1622-4950 ACIS-S None 85.0
+17:14:05.70 -38:10:30.90 CXO 171405-381031 ACIS-S None 85.0
+18:34:52.10 -08:45:56.00 Swift 1834-0836 ACIS-S None 85.0
+18:22:18.00 -16:04:26.80 Swift 1822-1606 ACIS-S None 85.0
+16:47:10.20 -45:52:17.00 CXO J164710.2-455216 ACIS-S None 85.0
+17:45:40.20 -29:00:29.80 SGR J1745-2900 ACIS-S None 85.0
+18:52:46.60 +00:33:17.00 3XMM J185246.6+003317 ACIS-S None 85.0
+18:18:51.40 -15:59:22.60 AX J1818.8-1559 ACIS-S None 85.0
+18:08:11.20 -20:38:49.00 SGR 1808-20 ACIS-S None 85.0
+18:00:59.00 -22:56:48.00 SGR 1801-23 ACIS-S None 85.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500642

Title: A possible near-infrared counterpart for the isolated neutron star in the Carina Nebula

Type: GO Total Time (ks): 20

Abstract: 2XMM J104608.7-594306 is one of only two thermally emitting isolated neutron stars (INSs) to be discovered since the ROSAT era. Likely a remnant of a former generation of massive stars in the Carina Nebula, its exact nature is unclear, and it might well occupy a unique role amongst the several groups of Galactic INSs. Very interestingly, we discovered a possible near-infrared counterpart lying inside the error circle of the X-ray source. We propose to observe the field of the neutron star with Chandra with the immediate goal to test the association. The positional accuracy attainable with Chandra will subsequently pave the ground for further investigations in the infrared and X-rays to be carried out, which will considerably constrain the neutron star evolutionary state.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+10:46:08.70 -59:43:06.50 2XMM J104608.7-594306 ACIS-S None 20.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500703

Title: The cooling of the Cas A CCO: fast or slow?

Type: GO Total Time (ks): 78

PI Name: Bettina Posselt

Abstract: The cooling curve of a neutron star constrains the properties of the superdense matter in its interior. An exciting rapid cooling of the 330 yr old neutron star in the Cas A SNR was recently inferred from 7 Chandra observations of 2000-2012, which, unfortunately, suffered from serious systematic uncertainties. Two dedicated observations with an optimal observational setup, carried out by our team in 2006 and 2012, did not show a statistically significant temperature decay. However, at the 3 sigma level, the rapid cooling still cannot be completely ruled out. To firmly exclude or confirm the rapid cooling and establish a tight constraint on the cooling rate, we propose an additional dedicated observation of this object, undistorted by the systematic errors.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+23:23:27.90 +58:48:42.60 Cas A CCO ACIS-S None 78.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500705

Title: Nonuniform expansion and brightening of the youngest Galactic SNR G1.9+0.3

Type: LP Total Time (ks): 400

PI Name: Kazimierz Borkowski

Abstract: We propose a 400-ks observation of the youngest Galactic supernova remnant (SNR) G1.9+0.3, to study its nonuniform expansion and monitor increase in brightness. Expansion along the major axis of G1.9+0.3 has been found to decrease with radius. The longer time baseline should help in understanding these surprising variations in expansion. No other Galactic SNR is brightening. The X-rays are mainly produced as synchrotron radiation from 10 -- 100 TeV electrons, so the magnitude and spatial dependence of the brightening rate have important implications for the physics of particle acceleration and magnetic-field amplification in fast shock waves. G1.9+0.3 is a unique SNR whose continued monitoring should greatly advance our understanding of Type Ia supernovae and nonthermal shock physics.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+17:48:45.00 -27:10:00.10 G1.9+0.3 ACIS-S None 400.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500718

Title: Expansion of Kes 73, a shell supernova remnant containing a magnetar

Type: GO Total Time (ks): 100

PI Name: Kazimierz Borkowski

Abstract: Formation and evolution of highly magnetized neutron stars (magnetars) remain poorly understood. We can learn about magnetars by studying their remnants. Kes 73 is a young supernova remnant containing a magnetar. But basic properties of Kes 73, including its age, remain poorly known. We propose a third-epoch observation of Kes 73 with Chandra. When combined with the 2000 and 2006 observations, this will allow for determination of the remnant's age through expansion rate measurements. We will also search for spatial variations in expansion rate that will help in understanding of the remnant's dynamics. New observations will also be used to determine abundances of heavy-element supernova ejecta, placing further constraints on the supernova that produced Kes 73.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+18:41:20.00 -04:56:11.00 Kes 73 ACIS-S None 100.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500720

Title: IDENTIFY THE SIGNATURE OF NEUTRON STAR MERGERS THROUGH RAPID CHANDRA/HUBBLE OBSERVATIONS OF A SHORT GRB

Type: TOO Total Time (ks): 50

PI Name: Eleonora Troja

Abstract: The afterglow of some short GRBs displays a late-time rebrightening, visible a few days after the gamma-ray burst. Recent HST observations provided tantalizing evidence that such a late-time bump could be explained as the emergence of the underlying kilonova emission. This would represent the incontrovertible signature of a neutron star merger, and the first direct link between short GRBs and their progenitors. Here we ask for a rapid (few days) and deep Chandra/HST follow-up observation of a short duration GRB in order to detect the expected kilonova bump, and to constrain the origin of the observed emission. Multi-band observations, and in particular X-rays, are critical to pin down the nature of the observed rebrightening, and to distinguish it from the standard afterglow emission.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
short GRB ACIS-S None 50.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500739

Title: (Re-)Constraining the Cosmic-Ray Acceleration Efficiency and Magnetic Field Strength in the Northeast Rims of RCW 86

Type: GO Total Time (ks): 70

PI Name: Hiroya Yamaguchi

Abstract: Accurate determination of SNR's shock velocity and magnetic filed is essential to reveal the mechanism of cosmic-ray acceleration. A previous velocity measurement with Chandra for the SNR RCW 86 northeast rim revealed that a substantial fraction of the postshock pressure is produced by the accelerated particles. However, there are disagreement with a H-alpha-measured velocity, and large uncertainty in the X-ray measurement itself, since the observation dates of the two Chandra datasets that were used for the proper motion measurement were not well separated with each other. We thus propose an additional observation of this region to measure the expansion velocity accurately. We will also constrain the magnetic field by searching for short-time variability in the synchrotron X-ray flux.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+14:45:03.60 -62:21:05.70 RCW 86 NE ACIS-S None 70.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500768

Title: The proper motion of the isolated neutron star RXJ0806.4-4123

Type: GO Total Time (ks): 35

PI Name: Bettina Posselt

Abstract: We propose a new Chandra epoch of the radio-quiet X-ray thermal isolated neutron star (XTINS) RXJ0806.4-4123 to check for X-ray variability, and to measure its proper motion which will enable a kinematic age study. The kinematic ages of XTINSs substantially deviate from their characteristic spin-down ages. Since the XTINSs allow to measure easily valuable surface temperatures, their correct ages are a mandatory requisite to assess the general cooling behavior of neutron stars. Based on the known close distance of RXJ0806.4-4123, a dedicated previous Chandra study, and simulations accounting for the changes in the ACIS detector, we estimate that a new 35ks Chandra exposure will constrain the minimum transverse velocity of the XTINS to better than 36km/s (3sigma).

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+08:06:23.40 -41:22:30.90 RXJ0806 ACIS-I None 35.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500812

Title: New Chandra Observations of the Archetypical Mixed-Morphology Galactic Supernova Remnant W28 (G6.4-0.1)

Type: GO Total Time (ks): 50

PI Name: Thomas Pannuti

Abstract: We propose to conduct two new ACIS-I observations of the archetypical mixed-morphology Galactic supernova remnant W28. Our prior Chandra observation of this remnant sampled interior thermal X-ray emission which was more uniform than expected based on prior ROSAT and ASCA observations. We have also detected a new hard X-ray source in the southwestern portion of W28 which may be a pulsar associated with this remnant. Our new proposed observations will sample this hard source as well as the luminous northeastern rim of W28, the site of an interaction between the SNR and an adjacent molecular cloud. These observations will help us develop a more complete picture of W28 and other mixed-morphology SNRs as well.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+18:01:46.00 -23:15:41.00 W28 Northeast ACIS-I None 50.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500832

Title: X-RAY COUNTERPARTS OF PUZZLING GEV-TEV SOURCES

Type: GO Total Time (ks): 120

PI Name: Oleg Kargaltsev

Abstract: We propose to look for X-ray counterparts of the extended TeV source HESS J1616-508 that may also have been detected with Fermi at GeV energies. The nature of the source and the connection between the TeV source and the nearby GeV sources are unknown. It has been suggested that it may be a relic plerion powered by the offset PSR J1617-5055, but a deep Chandra observation of this pulsar and its wind nebula has not confirmed this hypothesis. To understand the nature of this long-standing "dark accelerator", we propose to observe the GeV sources (which could be young pulsars) and another nearby young pulsar (J1614-5048) to check whether or not they could supply relativistic particles and power the TeV source. We will also explore the nature of the GeV sources.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+16:14:12.60 -50:48:00.10 2FGL J1615.0-5051 ACIS-I None 60.0
+16:16:10.20 -50:51:52.10 HESS J1616-508 ACIS-I None 60.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500844

Title: Deep study on the proper motion and collimated tail of the oldish PSR J2055+2539

Type: GO Total Time (ks): 130

PI Name: Martino Marelli

Abstract: The bright, radio-quiet, and possibly near, J2055+2539 is the less energetic non-recycled pulsar emitting in gamma-rays. In X-rays we found the faint, pulsating counterpart. Two tails of X-ray emission have been discovered protruding from the pulsar forming an angle of about 150deg. These tails are long - 13' and 4' - bright - 10 and 2 times the pulsar luminosity - and extremely collimated - the longest one is 5 to 20'' wide. These characteristics make J2055 tails the best test for all the nebular emission models, making it a better case than fainter Guitar nebula. Two Chandra observations at different epochs are requested in order to a) find the pulsar proper motion, with a possible alignment with one of the tails, and b) study the shape and low-scale structures of the nebulae.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+20:55:50.60 +25:41:08.30 PSR J2055+2539 nebula ACIS-S None 130.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500869

Title: The Astrophysics of the Most Energetic Gamma-Ray Bursts

Type: TOO Total Time (ks): 120

PI Name: Andrew Fruchter

Abstract: The Large Area Telescope (LAT) of Fermi has found a sample of highly relativistic gamma-ray bursts (GRBs), which may be among the most energetic bursts ever discovered. Here we propose to use Chandra and HST to follow the late time X-ray and optical light curves of a LAT detected burst that also has excellent early multiwavelength coverage. Our observations, in conjunction with the Fermi data, will allow us to measure the energy and the bulk Lorentz factor of the explosion. Recent work on some of the most powerful GRBs begins to substantially constrain physical models of the progenitors. The energetics of the highly relativistic LAT bursts may greatly strengthen these constraints and provide new insight into the currently unknown mechanism that determines the energy of a GRB.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
LAT Burst 1 ACIS-S None 120.0

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 16500912

Title: The Burst of the Century

Type: GO Total Time (ks): 120

PI Name: Andrew Fruchter

Abstract: The extraordinarily bright GRB 130427A has provided a multiwavelength data set unprecedented in the history of the field. However the light curve of this burst, like that of the large majority of LAT bursts, shows a puzzling lack of a jet break (the hallmark of a collimated outflow). We propose to continue our long-term monitoring of this GRB through to the end of 2015. A detection of a jet break will give us a direct measure of the absolute energy of the burst; its absence will effectively rule out a rotating neutron star as the central engine of the GRB.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+11:32:32.80 +27:41:56.20 GRB 130427A ACIS-S None 120.0

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620053

Title: Monitoring the Tidal Interaction of the Dusty Object G2 Appraoching Sgr A*

Type: GTO Total Time (ks): 100

PI Name: Gordon Garmire

Abstract: A 3 earth-mass cloud of gas and dust (G2) is approaching SgrA*. The center of mass will reach pericenter of around 3000 R_S during 2014 March/April. Gillessen et al. report evidence that tidal disruption of the gas cloud by SgrA* has begun, while Meyer et al. interpret G2 as a dust enshrouded star that will lose its circumstellar material at pericenter. Either way, G2 is expected to increase the accretion rate onto Sgr A* and subsequent X-ray emission near pericenter and for years to come. We propose 4x25ks GTO pointings with ACIS-S3 coupled with GO pointings to monitor tidal disruption and feeding of a SMBH in unprecedented detail. X-ray and multi-wavelength fluxes will discriminate between scenarios for G2 s origin and improve our understanding of inefficient accretion onto a SMBH.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+17:45:40.00 -29:00:28.20 SgrA* ACIS-S None 25.0
+17:45:40.00 -29:00:28.20 SgrA* ACIS-S None 25.0
+17:45:40.00 -29:00:28.20 SgrA* ACIS-S None 25.0
+17:45:40.00 -29:00:28.20 SgrA* ACIS-S None 25.0

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620080

Title: AN EFFICIENT SURVEY FOR GLOBULAR CLUSTER BLACK HOLES WITHIN 20 MPC

Type: GO Total Time (ks): 60

PI Name: Thomas Maccarone

Abstract: We propose to make moderate depth observations of three large elliptical galaxies within 20 Mpc which have not been observed with Chandra for at least 11 years. Making observations on a long time baseline allows the greatest sensitivity to the brightest X-ray transients, since there is both theoretical and empirical evidence that these objects have extremely long outburst durations. We wish to focus on developing a statistical sample of globular cluster black holes with these data, which we can accomplish by using ACIS-I in combination with our group's wide field ground-based optical data.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+12:26:11.80 +12:56:45.50 ngc 4406 ACIS-I None 20.0
+12:25:24.00 +18:11:27.90 NGC 4382 ACIS-I None 20.0
+15:06:29.60 +55:45:47.90 NGC 5866 ACIS-I None 20.0

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620121

Title: Galaxies in Collision: Arp 273

Type: GO Total Time (ks): 50

PI Name: Alan Levine

Abstract: Arp 273 comprises two colliding galaxies, a spectacular face-on large spiral galaxy and a smaller edge-on disk galaxy, at a distance of 110 Mpc. A multicolor HST image of the system, which extends over more than 100 arc seconds, shows great detail including many regions characterized by blue colors and/or dust where star formation must be ongoing. We propose to observe the system with ACIS-S for 50 ks to locate and study the luminous X-ray binaries and ultraluminous X-ray sources with luminosities above $10^{39}$ ergs/s. We will then investigate the luminosity function of the X-ray sources, the relationships between the sources and the star formation regions, and what the sources can say about the system geometry, dynamics, and evolution.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+02:21:30.60 +39:21:58.50 Arp 273 ACIS-S None 50.0

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620187

Title: Searching for Accreting Black Holes in Lyman Continuum Emitters

Type: GO Total Time (ks): 98

PI Name: Philip Kaaret

Abstract: The early universe was reionized, likely by UV light from massive stars. The two galaxies from which Lyman continuum radiation has been directly observed are both very luminous X-ray sources and the emission from one, Haro 11, is dominated by a hard-spectrum point-like source that is likely one or more accreting compact objects. Such objects can produce powerful outflows, rivaling the strength of stellar winds and supernovae, that prevent scattering and allow the Lyman emission to escape. We propose to observe with Chandra for the first time the other confirmed Lyman emitter and also to observe several recently identified Lyman emitter candidates. We will determine if there is a correlation between strong X-ray emission and Lyman continuum emission.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+12:50:18.90 -23:33:57.60 Tol 1247-232 ACIS-S None 30.0
+02:53:25.00 -00:13:57.00 GALEX J025325.8-001357 ACIS-S None 14.6
+08:07:55.00 +14:10:44.00 GALEX J080754.6+141045 ACIS-S None 16.3
+02:43:53.00 -00:37:08.00 GALEX J024352.8-003703 ACIS-S None 17.7
+10:07:12.00 +06:57:36.00 GALEX J100712.2+065736 ACIS-S None 19.4

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620343

Title: Super-massive black holes and nuclear star clusters in late type galaxies

Type: GO Total Time (ks): 95

PI Name: Elena Gallo

Abstract: We propose a search for weakly accreting super-massive black holes (SMBHs) in a homogeneous, distance-limited sample of late type galaxies known to host nuclear star clusters (NSCs) from HST photometry. This will be compared to a well-matched sample of early types with existing Chandra and HST coverage, enabling us to test the role of galactic morphology in shaping the NSC/SMBH properties. Specifically, we will measure, or put limits on: the nuclear X-ray luminosities down to the Eddington limit for a 10 solar mass black hole; ii) compare the fraction of nuclei hosting both SMBHs and NSCs in late vs. early types galaxies; iii) investigate the dependence of SMBH activity upon the NSC color, contrast and compactness.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+01:01:33.90 -07:35:17.70 NGC337A ACIS-S None 3.2
+01:07:25.10 -69:52:45.20 NGC406 ACIS-S None 4.8
+01:12:55.70 +00:58:53.70 NGC428 ACIS-S None 4.0
+03:30:47.20 -21:03:29.60 ESO548-G29 ACIS-S None 4.2
+03:31:30.60 -30:12:47.90 ESO418-8 ACIS-S None 3.1
+03:52:47.60 -47:28:39.00 NGC1483 ACIS-S None 2.5
+04:48:23.80 -59:48:01.10 NGC1688 ACIS-S None 2.8
+05:17:09.00 -64:57:35.30 NGC1892 ACIS-S None 3.6
+05:47:04.80 -51:33:10.60 NGC2104 ACIS-S None 2.6
+08:37:41.50 +51:39:08.50 UGC4499 ACIS-S None 2.5
+10:54:31.10 +17:17:04.50 NGC3455 ACIS-S None 4.5
+11:02:47.30 +17:59:22.30 NGC3501 ACIS-S None 4.8
+11:39:20.70 +46:30:48.20 NGC3782 ACIS-S None 2.9
+11:49:40.50 +48:25:33.40 NGC3906 ACIS-S None 4.5
+11:53:41.70 +47:51:31.60 NGC3949 ACIS-S None 3.4
+12:09:58.60 +46:27:25.80 NGC4144 ACIS-S None 1.0
+12:13:16.90 +43:41:53.70 NGC4183 ACIS-S None 4.1
+12:15:16.90 +13:01:25.80 NGC4206 ACIS-S None 2.0
+12:31:04.50 -08:03:14.00 NGC4487 ACIS-S None 3.4
+12:31:39.20 +03:56:22.00 NGC4496A ACIS-S None 2.8
+12:32:45.60 +00:06:54.10 NGC4517 ACIS-S None 4.3
+13:12:11.80 +44:02:16.90 NGC5023 ACIS-S None 1.0
+13:31:52.60 +20:00:04.20 UGC8516 ACIS-S None 4.4
+16:50:05.00 +42:44:23.40 NGC6239 ACIS-S None 4.5
+20:52:01.60 -69:11:35.90 IC5052 ACIS-S None 1.0
+22:49:45.80 -68:41:26.50 IC5256 ACIS-S None 1.6
+23:33:02.50 -51:41:54.10 NGC7690 ACIS-S None 5.2
+23:40:40.00 +26:14:09.80 UGC12732 ACIS-S None 2.4
+23:56:15.10 -43:25:39.10 ESO241-6 ACIS-S None 4.7

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620657

Title: Massive Black Holes in Water Maser Merging Galaxies

Type: GO Total Time (ks): 60

PI Name: Jeremy Darling

Abstract: We propose to observe the massive black holes (MBHs) in two merging galaxies identified by water masers. Both galaxies offer the opportunity to study the mass and accretion rate of MBHs in the early (IC 750) and late (IIZw40) stages of merging, crucial times for black hole growth and feedback. IIZw40, an advanced merger of two gas-rich dwarf galaxies, is a crucial window on the growth of black holes in the early universe. IC 750 is a spiral in a close pair with interaction-induced morphology, possibly activating the AGN, and a valuable case study of the initial conditions for major mergers and the growth of MBHs. Chandra observations will identify central black holes (perhaps two in IIZw40), constrain the maser excitation, and measure the accretion rate, key for feedback studies.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+05:55:42.60 +03:23:32.00 IIZw40 ACIS-S None 30.0
+11:58:52.20 +42:43:20.20 IC750 ACIS-S None 30.0

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620677

Title: Does the IMF vary with galaxy mass? The X-ray binary population of a key galaxy, NGC7457

Type: GO Total Time (ks): 100

PI Name: Mark Peacock

Abstract: We propose a 100ksec observation of NGC7457. The primary goal of this observation is to test for variations in the initial mass function (IMF). Many recent studies have proposed that the IMF varies systematically as a function of early-type galaxy mass. This has potentially dramatic consequences and must to be confirmed. The number of LMXBs in a galaxy (per stellar luminosity) can be used to provide an independent test of this hypothesis (see Peacock et al. 2014). Unfortunately, only galaxies with intermediate to high masses currently have the data needed to perform this test. The proposed observation of the elliptical galaxy NGC7457 will detect an order of magnitude more LMXBs in a low mass galaxy - hence providing the crucial constraint needed to significantly test for a variable IMF.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+23:00:59.90 +30:08:42.00 NGC 7457 ACIS-S None 100.0

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620755

Title: A Chandra Legacy Survey of the Disk of M31

Type: LP Total Time (ks): 350

PI Name: Benjamin Williams

Abstract: The only other galaxy in the Local Group that resembles our Galaxy is M31. Here we propose to create a Chandra ACIS mosaic of the northern disk of M31, a region examined with exquisite precision with HST. Only with both Chandra and HST can we identify counterparts of HMXBs. The resulting distribution of the luminosities, ages, and secondary star parameters will strictly constrain models of HMXB formation. In addition, we will resolve SNRs and superbubbles in M31, and compare their structure and energetics to those seen in M33 and the Galaxy. We will identify the background AGNs and use them to measure the X-ray absorption properties of the M31 disk. The Chandra, HST, and XMM data will create a legacy for space astronomy that will not be possible to duplicate in our lifetimes.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+00:44:18.70 +41:23:28.00 PHAT B6 ACIS-I None 50.0
+00:44:07.90 +41:35:21.70 PHAT B9 ACIS-I None 50.0
+00:45:08.30 +41:31:34.40 PHAT B10 ACIS-I None 50.0
+00:45:30.90 +41:42:34.20 PHAT B14 ACIS-I None 50.0
+00:44:50.10 +41:51:34.40 PHAT B15 ACIS-I None 50.0
+00:46:10.50 +41:57:36.10 PHAT B18 ACIS-I None 50.0
+00:46:19.10 +42:09:20.70 PHAT B21 ACIS-I None 50.0

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620759

Title: Triggered Observations of the Tidal Disruption of G2 As It Encounters Sgr A*

Type: TOO Total Time (ks): 100

PI Name: Daryl Haggard

Abstract: A dense, dusty object (G2) is on a collision course with Sgr A*, the radio source at our Galactic Center. G2 is on an eccentric orbit and shows signs of tidal disruption by the black hole. Models predict that high-energy emission from the Sgr A*/G2 encounter will peak at pericenter (March 2014) and continue over the next several years as the material circularizes. We propose four ToO ACIS-S observations, triggered if Sgr A*'s X-ray luminosity exceeds 10^34 erg/s, to study the radiation properties of Sgr A* as material from G2 breaks up and feeds the accretion flow, to constrain the rates and emission mechanisms of faint X-ray flares, and to detect G2 itself if it is shocked and heated.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+17:45:40.00 -29:00:28.10 Sgr A* ACIS-S None 100.0
+17:45:40.00 -29:00:28.10 Sgr A* ACIS-S None None
+17:45:40.00 -29:00:28.10 Sgr A* ACIS-S None None
+17:45:40.00 -29:00:28.10 Sgr A* ACIS-S None None

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620791

Title: Chandra Observation of an X-ray Outbursting Intermediate-mass Black Hole Candidate

Type: GO Total Time (ks): 40

PI Name: Dacheng Lin

Abstract: Intermediate-mass black holes (IMBH, ~10^2-10^5 solar mass) have been long sought after as they are associated with several important astrophysical processes and in tight binaries could emit gravitational waves. The best IMBH candidates are hyperluminous off-nuclear X-ray sources (HLX) with L_X >10^41 erg/s, but very few are known. We have found a new HLX candidate (L_X ~10^43 erg/s), which has a candidate host galaxy (z=0.145) with a possible ~1" offset and is experiencing a prolonged X-ray outburst. We require Chandra's supreme spatial resolution to confirm the off-nuclear nature, which would make it one of the best candidates for off-nuclear IMBHs known.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+15:00:52.10 +01:54:53.00 CXO J150052.1+015453 ACIS-S None 40.0

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620871

Title: S364 IN THE OLD OPEN CLUSTER M67: EXOPLANET HOST OR ACTIVE BINARY?

Type: GO Total Time (ks): 10

PI Name: Maureen van den Berg

Abstract: Radial-velocity variations of the red giant S364 in the open cluster M67 strongly suggest that it hosts a Jupiter-mass planet. This planet would be one of only ten planets known in star clusters, and one of the closest-in planets around evolved stars. Remarkably, S364 is also the only optical source near the 15'' error circle of a ROSAT source. We request a short (10 ks) ACIS-S exposure to improve the position of this ROSAT source. If S364 is found to be a match then this system is likely a magnetically-active binary seen almost pole-on that is in the act of circularizing its orbit and where the stellar rotation has already been synchronized to the orbital motion near periastron.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+08:49:56.80 +11:41:33.00 M67 - S364 ACIS-S None 10.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700010

Title: Shielding Gas Variations in Transforming Broad Absorption Line Quasars

Type: GO Total Time (ks): 36

PI Name: W.N. Brandt

Abstract: X-ray/EUV absorbing shielding gas is thought to be essential for the driving of Broad Absorption Line (BAL) quasar winds, but the nature of this key component requires further investigation. Using a large sample of multi-year BAL variability observations from SDSS-I/II/III, we have discovered a set of quasars that have fully transformed from being BAL quasars to non-BAL quasars; all BAL troughs have disappeared. A promising model for these transformations invokes variations of the shielding gas that increase the level of ionizing X-ray/EUV radiation reaching the BAL wind. We propose timely Chandra observations of 9 transforming BAL quasars to determine if their shielding gas has moved entirely out of our line-of-sight, leaving behind an X-ray unabsorbed non-BAL quasar.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+07:46:50.60 +18:20:28.70 SDSS J0746+1820 ACIS-S None 2.5
+09:36:20.50 +00:46:49.20 SDSS J0936+0046 ACIS-S None 3.0
+08:59:04.60 +04:26:47.80 SDSS J0859+0426 ACIS-S None 3.9
+15:22:44.00 +03:27:19.80 SDSS J1522+0327 ACIS-S None 3.7
+00:40:22.40 +00:59:39.60 SDSS J0040+0059 ACIS-S None 6.8
+15:21:49.80 +01:02:36.40 SDSS J1521+0102 ACIS-S None 3.7
+14:21:32.00 +37:52:30.30 SDSS J1421+3752 ACIS-S None 3.5
+13:32:11.20 +39:28:25.90 SDSS J1332+3928 ACIS-S None 4.9
+11:45:46.20 +03:22:51.90 SDSS J1145+0322 ACIS-S None 4.9

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700095

Title: The Complex Fe-K Emission of Compton-Thick AGNs

Type: GO Total Time (ks): 245

PI Name: Giuseppina Fabbiano

Abstract: CT AGNs have the characteristics predicted for the buried pre-blow-out phase in the CDM merger cycle of galaxy and SMBH evolution. We propose to exploit Chandra s unique imaging resolution in the 6-7keV band, for a spatial/spectral study with ACIS of the dense nuclear surroundings of two optimally selected CT AGNs, for which archival Chandra ACIS data suggest complex Fe-K regions. We will (1) obtain a direct spatial/spectral picture of the interaction of the SMBH with the surrounding clouds, (2) investigate the obscuring torus, and (3) explore the existence of close (~100pc) dual AGNs, suggested by merging simulation. The softer energy band will be sensitive to ionization cones, measuring the power of feedback in the near universe in an optimally selected sample.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+07:16:31.20 -29:19:29.00 IRAS07145-2914 ACIS-S None 130.0
+14:32:40.70 -44:10:28.00 NGC5643 ACIS-S None 115.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700103

Title: Probing the Growth of Massive Black Holes in Dwarf Galaxies with Chandra and HST

Type: GO Total Time (ks): 92

PI Name: Amy Reines

Abstract: The study of massive black holes (BHs) in dwarf galaxies can place valuable constraints on the birth and growth of the first supermassive BH seeds. We propose Chandra and HST observations of 8 dwarf galaxies from our recent sample of optically-selected AGN in galaxies with stellar masses comparable to the Magellanic Clouds (Reines et al. 2013). Our target galaxies host broad-line AGN and contain the least-massive BHs known in galaxy nuclei. The proposed observations will enable us to characterize the compact X-ray and UV emission from the AGN, estimate Eddington ratios for the smallest BHs known, and investigate host galaxy properties and BH scaling relations at the sparsely populated low-mass end.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+02:46:56.40 -00:33:04.90 J024656.39-003304.8 ACIS-S None 16.0
+09:06:13.80 +56:10:15.50 J090613.75+561015.5 ACIS-S None 16.0
+09:54:18.20 +47:17:25.10 J095418.15+471725.1 ACIS-S None 8.0
+14:40:12.70 +02:47:43.50 J144012.70+024743.5 ACIS-S None 7.0
+08:51:25.80 +39:35:41.70 J085125.81+393541.7 ACIS-S None 13.0
+15:26:37.40 +06:59:41.70 J152637.36+065941.6 ACIS-S None 11.0
+16:05:31.80 +17:48:26.20 J160531.84+174826.1 ACIS-S None 8.0
+08:40:29.90 +47:07:10.40 J084029.91+470710.4 ACIS-S None 13.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700128

Title: The Nature of Quasars with Redshifted Broad Absorption Lines

Type: GO Total Time (ks): 46

PI Name: W.N. Brandt

Abstract: We have recently identified the first compelling examples of quasars with redshifted Broad Absorption Lines (BALs) in the massive spectroscopic databases from the SDSS-I/II/III. These quasars can provide novel insights into the structure of quasar inflows/outflows; we may be observing gas infall to small radii, rotationally dominated outflows, or binary quasars where a wind is seen in silhouette. Here we propose exploratory Chandra observations that will test these models by assessing if heavy X-ray absorption from shielding gas, thought to be essential for the driving of typical BAL winds, lies along our line of sight. These observations will be a central part of our multiwavelength program aiming to determine robustly the nature of quasars with redshifted BALs.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+17:24:04.40 +31:35:39.60 SDSS J1724+3135 ACIS-S None 9.9
+21:57:04.30 -00:22:17.70 SDSS J2157-0022 ACIS-S None 13.2
+11:25:26.10 +00:29:01.30 SDSS J1125+0029 ACIS-S None 3.7
+08:30:30.30 +16:54:44.70 SDSS J0830+1654 ACIS-S None 6.0
+16:28:05.80 +47:44:15.60 SDSS J1628+4744 ACIS-S None 4.8
+10:34:12.30 +07:20:03.60 SDSS J1034+0720 ACIS-S None 4.0
+11:28:28.30 +01:13:37.90 SDSS J1128+0113 ACIS-S None 5.4

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700135

Title: Extended X-ray Emission From a Quasar-driven Superbubble

Type: GO Total Time (ks): 80

PI Name: Jenny Greene

Abstract: We propose to look for the X-ray component of a bona-fide quasar-driven wind, manifested as a 20 kpc-scale superbubble in the warm ionized gas. With ALMA and JVLA observations, we have ruled out star formation or a radio jet as the source of the outflow, and we have detected very soft (<1 keV) X-ray photons spatially coincident with the superbubble. With our existing 20 ks observation, we cannot determine whether the X-rays arise from the hot outflow or photoionized gas. With an additional 80ks observation (100 ks total), we will use the X-ray morphology and spectrum to distinguish these two possibilities. A single-orbit HST observation will allow us to both build a pure emission line map of the outflow and (via scattered light) teach us about the ambient density in the outflow.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+13:56:46.10 +10:26:09.00 SDSS J135646.10+102609.0 ACIS-S None 80.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700161

Title: Chandra observation of SDSS J2222+2745

Type: GO Total Time (ks): 70

PI Name: David Pooley

Abstract: We propose to observe the recently discovered SDSS J2222+2745, a system in which a cluster of galaxies strongly lenses a background quasar and produces six images, two of which are very difficult to extract in the optical. This object is of singular cosmological importance as it may be the only such quasar/cluster lens in the universe producing more than five images. Our proposed Chandra observation will confirm the existence of these images and determine whether any microlensing-induced flux ratio anomalies exist. The current mass model of the system predicts flux ratios that are discrepant with the optical observations, and the crucial question is whether this is due to an imperfect mass model or to microlensing. Our proposed Chandra observation will answer this.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+22:22:08.60 +27:45:33.20 SDSS J2222+2745 ACIS-S None 70.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700185

Title: Triggering Chandra to Detect an X-ray Counterpart to TeV Flaring from M87 During Cycle 16

Type: TOO Total Time (ks): 35

PI Name: Daniel Harris

Abstract: From VERITAS, HESS, and MAGIC observations, it appears that there are TeV flaring states for M87 which last a few days to a week or more and provide many detections at a level significantly higher than the quiet state. Because we model the TeV emission as IC scattering by the same electrons responsible for X-ray synchrotron emission, we expect that TeV variability will be mirrored in the X-rays. To determine the location of TeV flaring, to further constrain X-ray time scales, and to obtain simultaneous photometry to refine sync/IC calculations, we request a Chandra ToO program to be triggered by TeV flaring. We request 35ks, divided into 7 daily 5ks observations so as to construct a light curve for comparison with those obtained by the Cherenkov observatories.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+12:30:49.00 +12:23:30.00 M87 ACIS-S None 35.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700223

Title: Keeping Tabs on the Unique Jet in M87 During Cycle 16

Type: GO Total Time (ks): 10

PI Name: Daniel Harris

Abstract: We request 2 observations of the M87 jet at 5 ks each. The first should be in Dec 2014 and the second in 2015 Mar. There are three reasons for this modest proposal: (1) If our M87 ToO is triggered, we need to know the intensity of each component in the jet before the onset of TeV flaring. (2) To ascertain if the nucleus, knot HST-1, or knot D (known to be variable in the optical) have increased substantially since our most recent observation (2013 Dec): if we were to find a substantial change, a DDT request would be instigated. (3) To extend the time baseline for evaluation of long term intensity decay of knots which is expected for synchrotron losses of the very high energy electrons responsible for the X-ray emission.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+12:30:49.00 +12:23:30.00 M87 ACIS-S None 10.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700228

Title: Investigating shocked gas at crucial jet power

Type: GO Total Time (ks): 65

PI Name: Diana Worrall

Abstract: Radio galaxies at the FR I/II boundary dominate the heating effects of radio sources, but the active physical mechanisms in the typical group-scale medium are relatively unknown. Here we propose a 65-ks ACIS-S exposure of PKS B1416-493, one of the brightest FR I/II sources unobserved with Chandra. It has similar characteristics to other FR I/II sources where strong shocks have been found. PKS B1416-493 is associated with a prominent RASS source, and has similar radio morphology to FR I/II shock-bounded sources. Should shocks be found in PKS B1416-493 as well, then existing values for radio-source heating by this important source population based on cavity power alone are underestimates.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+14:20:03.70 -49:35:42.30 PKS B1416-493 ACIS-I None 65.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700232

Title: ULTRAMASSIVE BLACK HOLES: FUNDAMENTAL PLANE AND CORONAE

Type: GO Total Time (ks): 116

PI Name: Kayhan Gultekin

Abstract: We will measure the X-ray flux and radio continuum of 7 ultramassive BHs (M>3e9) to test competing models of the fundamental plane (FP) of BH accretion. The FP relates the X-ray, radio, and mass of an accreting BH, and demonstrates there is a connection between BH inflow and outflow. The FP is derived mostly from BHs with masses under 2e9. It is not clear if the FP holds for the largest BHs. The 2 ways to create the FP, with only SMBHs OR jointly with SMBHs and stellar BHs, differ by 100 for the largest BHs. Only with Chandra we can separate corona and AGN to determine it. Coronae around huge BHs are critical in limiting feeding so that we can understand the gas supply around and accretion onto the largest BHs.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+02:42:29.00 +18:09:52.80 MCG+03-07-047 ACIS-S None 31.0
+02:29:14.00 +23:04:57.60 IC 1802 ACIS-S None 17.0
+08:28:47.10 -06:56:24.60 Mrk 1216 ACIS-S None 13.0
+13:24:52.90 -04:04:55.00 NGC 5133 ACIS-S None 12.0
+10:56:16.00 +42:19:59.10 PGC 032873 ACIS-S None 25.0
+02:24:44.40 +42:37:22.50 UGC 1859 ACIS-S None 10.0
+03:22:02.90 +40:51:50.00 UGC 2698 ACIS-S None 8.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700278

Title: AGNs Formed in Protogalaxies Associated with Sub-DLAs

Type: GO Total Time (ks): 167

PI Name: George Chartas

Abstract: We propose to obtain deep observations of 4 quasars known to contain sub-damped Lyman-alpha absorbers in their optical/UV spectra. Our goal is to verify the presence of candidate AGN suggested in these sub-DLAs from short exposure archival Chandra data. The proposed observations may provide the first detection of AGN in protogalaxies/young galaxies with known cold-gas abundances and kinematics and from the X-ray luminosities of these AGN provide rough estimates of their black hole masses.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+13:23:23.70 -00:21:55.00 PSS 1323-0021 ACIS-S None 11.0
+09:55:11.30 +59:40:31.00 PSS 0955+5940 ACIS-S None 44.0
+09:57:44.40 +33:08:20.70 SDSS J095744.46+330820.7 ACIS-S None 47.0
+01:33:40.30 +04:00:59.00 PSS 0133+0400 ACIS-S None 65.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700335

Title: MERGER-TRIGGERED NUCLEAR ACTIVITY AT SUB-KILOPARSEC SCALES

Type: GO Total Time (ks): 70

PI Name: Giuseppina Fabbiano

Abstract: Galaxy mergers are key in galaxy evolution as they can trigger active galactic nucleus (AGN) activity. A pair of supermassive black holes (BHs), potentially AGN, is expected to form in the last stage of a merger. Therefore, the identification and characterization of binary AGN in an evolved merger stage (i.e. at sub-kpc scales) and comparison with other merger stages is crucial for understanding the BH-galaxy coevolution and the role of mergers in AGN fueling. Yet very few sub-kpc binary AGN have been identified. We request a 70ks Chandra observation to probe the AGN nature of seven sub-kpc binary AGN candidates located in galaxies that span a range of merger stages and mass ratios. This will allow investigating the connection between mergers and AGN-triggered activity and BH growth.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+09:17:05.30 +25:25:45.10 Mrk1230 ACIS-S None 10.0
+11:38:13.00 +12:06:42.90 NGC3773 ACIS-S None 10.0
+11:12:39.80 +09:03:20.60 Mrk 731 ACIS-S None 10.0
+09:49:30.40 +55:34:47.80 Mrk 22 ACIS-S None 10.0
+09:16:45.50 +53:26:34.10 Mrk 104 ACIS-S None 10.0
+10:48:56.90 +12:11:41.80 Mrk 1263 ACIS-S None 10.0
+12:24:40.10 +03:18:12.20 MCG+01-32-049 ACIS-S None 10.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700345

Title: The Central Engine of the Most Luminous Quasars

Type: GO Total Time (ks): 214

PI Name: Enrico Piconcelli

Abstract: We propose here to perform ACIS-S spectroscopy of a sample of seven WISE selected Type 1 QSOs at 2 < z < 4 for a total exposure time of 280 ks. Our targets stand out for being the most luminous (LBol > 1e47 erg/s) QSOs at the epoch when both cosmic star formation density and QSO activity reach their peaks. Previous Chandra snapshots indicate that these QSOs are apparently X-ray weak. Our goal is to assess if the X-ray weakness is due to an obscuring screen along our line of sight to the nucleus or to a quenched coronal emission.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+07:35:02.30 +26:59:11.50 SDSS J073502.30+265911.5 ACIS-S None 25.0
+02:09:50.70 -00:05:06.40 SDSS J020950.70-000506.4 ACIS-S None 30.0
+15:13:52.50 +08:55:55.80 SDSS J151352.52+085555.7 ACIS-S None 30.0
+21:23:29.50 -00:50:52.90 SDSS J212329.46-005052.9 ACIS-S None 40.0
+08:01:17.80 +52:10:34.60 SDSS J080117.79+521034.5 ACIS-S None 44.0
+11:11:19.10 +13:36:03.90 SDSS J111119.10+133603.8 ACIS-S None 45.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700361

Title: X-ray observations of the nuclear activity in strongly lensed star forming galaxies at redshift >1.5

Type: GO Total Time (ks): 80

PI Name: Marcella Massardi

Abstract: We propose ACIS-S observations of 5 strongly lensed galaxies having z>1.5 and hints of a mid-IR excess over standard SEDs of star-forming galaxies suggestive of the presence of an AGN. By taking advantage of the lensing magnification, we aim to look for weak nuclear activity associated to high-z galaxies with large SFRs, hence to extend the investigation of the relationship between star formation and nuclear activity to intrinsically less luminous, more representative of the general population, high-z star forming galaxies than was possible so far. These pilot observations will allow us to image the lensed systems to a resolution of 0.5 arcsec, reaching fluxes~(0.2-65)x10^-14 erg/cm^2/s (depending on source properties) in ~40ks per source, estimated enough to detect their AGN components.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+09:10:43.10 -00:03:22.90 HATLASJ091043.0-000322 ACIS-S None 20.0
+09:07:40.00 -00:41:59.80 HATLASJ090740.0-004200 ACIS-S None 60.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700373

Title: Quasar and AGN Variability on 10-100 kyr Timescales

Type: GO Total Time (ks): 90

PI Name: Walter Maksym

Abstract: The extended emission line region (EELR) "Hanny's Voorwerp" Has provide a critical example of AGN shutdown on short timescale. But more X-ray observations of similar objects are necessary to explore the role of feedback and mode switching in this phenomenon. We proprose observations of two select EELR galaxies which have similar properties in order to explore the effects these faded AGNs have had on their host galaxies.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+16:28:04.00 +51:46:31.50 Mkn 1498 ACIS-S None 20.0
+18:16:11.70 +42:39:37.30 UGC 11185 ACIS-S None 70.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700376

Title: Explanatory X-ray observation of a hyper-luminous quasar at the end of reionization era

Type: GO Total Time (ks): 14

PI Name: Xiaohui Fan

Abstract: We have discovered an extremely luminous high redshift (z=6.3) quasar selected by SDSS and WISE color. It is 10 times brighter than an average SDSS $z \approx 6$ quasars with bolometric luminosity of $4.26\times10^{14}L_{\odot}$. Deep optical and near-IR spectroscopy shows that this object has very weak rest-frame UV emission lines, including $Ly\alpha+NV$, CIV and MgII. It is thus the most luminous and highest redshift example of a family of Weak Emission Line Quasar. We propose exploratory {\it Chandra} observation for this hyper-luminous quasar and obtain basic X-ray properties of this quasar. The proposed observation will help to probe the black hole growth and possible explanations for the weakness of emission lines.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+01:00:13.20 +28:02:25.80 SDSS J010013.02+280225.8 ACIS-S None 14.9

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700427

Title: Solving the X-ray Origin Problem in Large-scale Jets with Chandra and Fermi Observations

Type: GO Total Time (ks): 225

PI Name: Eileen Meyer

Abstract: We propose deep ACIS-S observations of five kpc-scale powerful quasar jets, previously detected in short exposures 10-13 years ago, to accurately measure the X-ray flux level and spectral index for individual knots in the resolved jet. We are motivated by our recent results that in two powerful sources, 3C 273 and PKS 1136-135, the X-rays are synchrotron, rather than the widely believed IC emission off the CMB. These two models imply radically different jets and deep Chandra imaging is necessary to distinguish between them with the help of existing Fermi data. The proposed targets have been selected to cover almost 2 orders of magnitude in jet power, which allows us to evaluate the X-ray emission mechanism over a wide range of jet powers.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+00:20:25.20 +15:40:55.00 3c 9 ACIS-S None 85.0
+02:37:52.40 +28:48:09.00 0234+285 ACIS-S None 40.0
+16:42:07.80 +68:56:40.00 1642-690 ACIS-S None 65.0
+19:27:48.50 +73:58:02.00 1928+738 ACIS-S None 35.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700447

Title: Probing the Physics of Quasar Outflows using Mini-LoBALs

Type: GO Total Time (ks): 72

PI Name: Karen Leighly

Abstract: Broad absorption-line quasars are X-ray weak but have hard spectra, suggesting they are quasars viewed through an equatorial wind and associated X-ray shielding gas. The X-ray weakest objects, LoBALs, are viewed through the thickest part of the outflow, while the relatively X-ray bright miniBALs are less absorbed, with a view just skimming the outflow. We propose short (5-11ks) observations of a well-defined sample of 10 mini-LoBALs: objects with narrow MgII absorption lines. If they are X-ray weak like LoBALs, differential column density is the key physical parameter; if X-ray bright like miniBALs, viewing angle is critical. In combination with in-hand optical and infrared spectra, 73ks of Chandra time will provide important information on BALQSO astrophysics at many wavelengths.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+08:09:34.60 +25:48:38.00 SDSS J080934.64+254837.9 ACIS-S None 7.9
+08:53:57.90 +46:33:51.00 SDSS J085357.87+463350.6 ACIS-S None 8.5
+09:03:13.90 +31:20:15.00 FBQS J090313.9+312015 ACIS-S None 7.0
+09:19:38.60 +36:02:47.00 SDSS J091938.63+360247.0 ACIS-S None 7.5
+10:13:26.90 +35:58:07.00 TON 1189 ACIS-S None 4.6
+10:28:39.10 +45:00:09.00 SDSS J102839.11+450009.4 ACIS-S None 4.5
+12:19:11.10 +04:29:06.00 SDSS J121911.16+042905.8 ACIS-S None 8.7
+12:43:00.90 +15:35:11.00 LBQS 1240+1551 ACIS-S None 10.6
+13:09:52.90 +01:19:51.00 SDSS J130952.88+011950.7 ACIS-S None 5.9
+14:04:47.80 +05:37:08.00 SDSS J140447.81+053708.2 ACIS-S None 6.9

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700470

Title: Uncovering the True Nature of Warm-Absorbing Winds: The Power of the Fe XXII Doublet

Type: LP Total Time (ks): 700

PI Name: Ashley King

Abstract: We propose to observe the Seyfert 1 galaxy, NGC 4051 to securely detect the Fe XXII absorption lines. This doublet will accurately determine the density, mass-outflow rate and the liberated kinetic power for the first time in an X-ray detected, warm-absorbing wind. Currently, wind estimates in AGN fall just short of providing enough material and energy to their bulges to affect its evolution and structure. However, with more accurate density measurements this discrepancy is likely to be resolved. In addition, this study is the last chance to lead the way spectroscopically before Astro-H comes on-line. We request 700 ks with the Chandra HETG to observe the warm-absorbing winds in NGC 4051.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+12:03:09.60 +44:31:53.00 NGC 4051 ACIS-S HETG 700.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700473

Title: The very unusual gamma-ray source PMN J1603-4904 and its neighbors

Type: GO Total Time (ks): 10

PI Name: Roopesh Ojha

Abstract: The bright $\gamma$-ray source PMN\,J1603--4904 exhibits very unusual multiwavelength properties, suggesting that this source might be the first young radio galaxy detected at GeV energies. A confirmation of this important result urgently needs excluding possible source confusion which could in principle account for the unusual broadband spectrum. We propose joint \chandra/ACIS-I (10\,ksec) and HST-WFC3UVIS (2000\,s) observations in order to validate this multiwavelength association, which is not trivial in this crowded field close to the Galactic plane. Deep imaging in the optical and X-rays is crucial for understanding the physical nature of this exceptional object and can only be addressed by these instruments requiring high angular resolution and low background.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+16:03:50.70 -49:04:05.10 PMN J1603-4904 ACIS-I None 10.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700512

Title: 3C190: Probing the extreme AGN blowout phase of galaxy evolution

Type: GO Total Time (ks): 42

PI Name: Andy Goulding

Abstract: We propose joint 42ks Chandra ACIS-S & 4hrs(2+2) JVLA radio observations of 3C190, a z~1.2 merger-remnant harboring an extremely luminous compact steep spectrum radio QSO. A previous 3ks ACIS-S snapshot showed a powerful unobscured X-ray nucleus and possible extended hot gas. However, the multi-wavelength properties show 3C190 uniquely presents strong Si-absorption, and hence, a heavily obscured QSO. Our proposed observations will accurately constrain the intrinsic X-ray properties of the central QSO, including the obscuring column density and accretion rate, as well as discover the extent and properties of the extended hot gas. In turn, we will directly test if 3C190 is undergoing a short-lived, but pivotal, transition from an obscured to unobscured QSO.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+08:01:33.50 +14:14:42.90 3C190 ACIS-S None 42.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700515

Title: An X-ray, UV, and radio probe of the PG 1211+143 inflow-outflow dynamics

Type: LP Total Time (ks): 450

PI Name: Julia Lee

Abstract: We propose for a Chandra HETGS (450ks), HST COS (4 orbits), and JVLA (5 hrs JVLA-A) study of the QSO PG 1211+143. With Chandra, we will measure the kinematics of the ionized wind to establish energetics. Contemporaneous Chandra-HST observations will be necessary for determing thermodynamic stability conditions and wind-driving mechanisms. JVLA observations will enhance the outflow studies by identifying the radio emission (possibly from a jet) associated with PG1211, to tie in with HETGS studies of its ionized wind(s). Strong gravity signatures in PG 1211 using traditional methods and new probes will also be assessed. Existing Chandra LETGS, XMM RGS, Suzaku spectra lack the spectral resolution and S/N to enable a clear picture of the PG1211 inflow-outflow dynamics.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+12:14:17.60 +14:03:12.50 PG 1211+143 ACIS-S HETG 450.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700548

Title: X-ray monitoring of Sgr A* during outburst

Type: TOO Total Time (ks): 280

PI Name: Gabriele Ponti

Abstract: This is a resubmission of last year's (updated according to the latest results) un-triggered ToO program. "In the event that the Galactic Centre super-massive black hole (BH), SgrA*, goes into outburst (L>=10^36 erg s^-1) during Cycle-16, we propose to trigger a 100ks HETG observation, followed by a monitoring campaign of several 40ks HETG observations. During such an outburst SgrA* will become the brightest AGN in the 2-10 keV sky. Our proposed observations will offer powerful new insights into the BH accretion process."

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+17:45:40.00 -29:00:28.10 Sgr A* ACIS-S HETG 280.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700636

Title: Intermittent Outbursts in CGCG 292-057: Jet Duty Cycle and Jet-ISM Interactions

Type: GO Total Time (ks): 90

PI Name: C.C. Cheung

Abstract: The galaxy CGCG292-057 displays a disturbed post-merger optical morphology. We have discovered that it hosts a radio source with complex structure characterized by a pair of compact (20 kpc) inner lobes embedded within larger-scale (270 kpc) outer lobes with winged/X-shaped morphology. These characteristics are believed to be distinct signatures of intermittent jet activity from the central engine. We request a 90 ks Chandra exposure in order to understand the complex duty cycle in the system by investigating the spectral and spatial properties of the hot ISM interacting with the compact inner lobes. The proposed observations are expected to provide novel constraints on the feedback processes related to the co-evolution of jetted supermassive black holes with their galactic hosts.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+11:59:05.70 +58:20:36.10 CGCG 292-057 ACIS-S None 90.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700656

Title: UNCOVERING AGN FUELING AND FEEDBACK IN DWARF GALAXIES

Type: GO Total Time (ks): 120

PI Name: Richard Mushotzky

Abstract: While massive black holes (BHs) are ubiquitous in massive galaxies, their presence in dwarf galaxies is less certain. This constitutes a major gap in our understanding of BH-galaxy co-evolution. Identifying low-mass BHs in local dwarfs could also constrain BH seed formation at high z. Active BHs in dwarfs can reveal BH fueling and feedback in a vastly different regime than the well-studied AGN in massive hosts. Most AGN feedback models focus on the latter, as star formation is thought to suffice to drive feedback in dwarfs. However, AGN are increasingly found in dwarfs, where their effect on hosts may be most dramatic. We propose an unprecedented program to detect and characterize AGN fueling and feedback in the low-mass regime, using a unique sample of Swift-BAT AGN in dwarf

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+12:06:22.90 +52:42:39.90 NGC4102 ACIS-S None 30.0
+12:09:29.70 +43:41:07.10 NGC4138 ACIS-S None 30.0
+05:05:45.70 -23:51:14.00 2MASXJ05054575-2351139 ACIS-S None 10.0
+04:14:52.00 -07:55:39.00 IRAS04124-0803 ACIS-S None 10.0
+14:40:38.00 +53:30:15.00 Mrk477 ACIS-S None 10.0
+12:38:54.00 -27:18:28.00 ESO506-G027 ACIS-S None 10.0
+15:48:25.00 -13:45:28.00 NGC 5995 ACIS-S None 10.0
+03:53:42.00 +37:14:07.00 2MASX J03534246+3714077 ACIS-S None 10.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700678

Title: X-Ray Production in the Unique Relativistic Tidal Disruption Event Sw1644+57

Type: GO Total Time (ks): 120

PI Name: Bevin Zauderer

Abstract: AGN produce relativistic jets with >Myr lifetimes that preclude observations when the jets turn on or off. Thus, transient accretion onto a supermassive black hole through the tidal disruption of a star can offer unique insight into the process of relativistic jet birth and death. In 2011 Swift discovered the first such event, providing unprecedented insight into jet activity from a previously dormant SMBH. Following our demonstration that a relativistic jet was launched at the time of gamma-ray discovery, the goal of this Chandra proposal is to test our recent suggestion that the relativistic jet turned off about 500 days later. The proposed observation (supported by extensive radio data) will confirm that the jet turned off and determine the nature of the residual X-ray emission.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+16:44:49.90 +57:34:59.70 Sw1644+57 ACIS-S None 120.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700687

Title: The Curious Case of NGC 4968

Type: GO Total Time (ks): 50

PI Name: Stephanie LaMassa

Abstract: NGC 4968 is a local obscured AGN that has an extreme Fe K-alpha equivalent width (EW = 3.1$^{+0.99}_{-0.78}$ keV) as measured by XMM-Newton. This EW is indicative of Compton-thick obscuration and potentially a strong circumnuclear starburst, though the quality of the XMM data precludes a proper analysis of these processes. We request a 50 ks Chandra observation to isolate the nuclear region from the host galaxy, search for spectroscopic signatures of a circumnuclear starburst, and model the AGN spectrum with physically motivated, self-consistent models, such as MYTorus, to investigate the properties of the likely Compton-thick X-ray reprocessor.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+13:07:06.00 -23:40:37.00 NGC 4968 ACIS-S None 50.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700713

Title: A novel method to constrain black hole and gas masses in z>6 quasars using the synergy of X-ray/millimeter observations

Type: GO Total Time (ks): 80

PI Name: Simona Gallerani

Abstract: We propose to detect in X-ray SDSS J1148+5251 (z=6.4), one of the most extreme and best studied high-z QSOs. In this object, we have recently discovered through millimeter observations the CO(17-16) emission line, namely the most excited CO rotational line ever detected at these z. The proposed 80 ks ACIS observation will be used to test a model of the ISM specifically designed for this object and obtain tight constraints on the SMBH and molecular hydrogen mass. Our model predicts that high-J CO lines are powerful tracers of X-ray activity, especially in QSOs enshrouded in a thick cocoon of gas and dust. The proposed experiment will test the new idea of using high-J CO lines for detecting (even z>6) obscured QSO, expected to be undergoing a key early phase of the QSO/galaxy co-evolution.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+11:48:16.60 +52:51:50.20 SDSS J114816.64+525150.3 ACIS-S None 80.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700719

Title: Strong shocks in 3C 15

Type: GO Total Time (ks): 130

PI Name: Beatriz Mingo

Abstract: We propose a 130 ks observation of 3C 15, a powerful radio galaxy which, atypically, shows evidence for strongly shocked shells of gas spanning 50 kpc. The implications of a strong shock in 3C 15 challenge standard assumptions about the nature and dynamics of lobes in powerful radio galaxies. Characterising the extended emission in this source will help us determine the role of power scaling, environment, particle content and feedback in jet-driven shocks across the entire radio-loud AGN population.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+00:37:04.10 -01:09:08.00 3C 15 ACIS-S None 130.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700780

Title: Chandra Observation of an Ultrasoft Active Galactic Nucleus with a 3.8 hr Periodicity

Type: GO Total Time (ks): 40

PI Name: Dacheng Lin

Abstract: Abstract: The source 2XMM J123103.2+110648 was recently discovered to show many intriguing properties, including being a strong candidate for a high Eddington-ratio true type 2 active galaxy lacking the broad line region, important for the standard Unified Model for active galactic nuclei, and showing a strong quasi-periodic X-ray oscillation, important for understanding the black hole scale invariance nature. To understand the origin of the very high luminosity emission we propose a deep Chandra follow-up observation, ten years after the previous XMM-Newton pointings, to determine its long-term evolution.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+12:31:03.20 +11:06:48.00 2XMM J123103.2+110648 ACIS-S None 40.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700793

Title: Strong FR II galaxy 3C 220.1 in a cluster cool core

Type: GO Total Time (ks): 182

PI Name: Ming Sun

Abstract: AGN outbursts have significant impact on structure formation and evolution. Their imprint on the ICM (e.g., cavities and shocks) provides an historical chronicle of the SMBH activity. Because of the general correlation between radio luminosity and AGN jet power, FR II galaxies are ideal targets to study the biggest AGN outbursts. However, FR II galaxies have been little studied so far in the X-ray cavity samples, as few FR II galaxies are located in large X-ray cool cores. We have done a comprehensive search for ideal strong FR II galaxies in large X-ray cool cores. In this proposal, 182 ks observations are requested for a rare example of a strong FR II in the cool core of a rich cluster (3C 220.1), undergoing strong mechanical and radiative feedback.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+09:32:40.00 +79:06:30.00 3C 220.1 ACIS-S None 182.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700846

Title: Is the Most Concentrated Infrared Luminosity Density in the Universe dominated by an AGN or a Hyper-Starburst?

Type: GO Total Time (ks): 50

PI Name: Joaquin Vieira

Abstract: The most remarkable object discovered thus far in the South Pole Telescope survey of 2500deg^2 is SPT0346-52. This strongly lensed system at z=5.7 has the highest IR luminosity density of any object known, but the source of its power is unclear. Is SPT0346 undergoing a massive, maximum starburst phase, or is its incredible luminosity driven by accretion onto a central black hole? We propose deep 50ks observations of SPT0346 which will provide the answer. This depth, and the very high energy photons probed, ensure that even a moderately powerful AGN will be detectable. Stronger AGN activity will allow us to constrain the spectral slope and N_H, and construct lens models based on the X-ray emission. A non-detection would be most surprising, implying very high (80%) star formation efficiency.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+03:46:41.10 -52:05:02.20 SPT-S J034640-5205.1 ACIS-S None 50.2

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700859

Title: The Rise to Power: Half a Billion Years of Intense AGN Activity in the Merging Cluster Cygnus A

Type: XVP Total Time (ks): 2000

PI Name: Michael Wise

Abstract: As the closest powerful radio galaxy, Cygnus A is the definitive laboratory for studying the radio galaxy physics in dense environments. Cygnus A resides in a cluster currently undergoing a nearly equal mass, major merger. Our proposed Chandra observation will quantify the energy exchange between the radio plasma emitted by the SMBH and the surrounding atmosphere. The Chandra image will also map the jet termination hotspots at high resolution and produce the most accurate measurements of jet energetics in any powerful radio galaxy. Our deep map of the cluster-scale emission will provide a complete record of the AGN power output over the past half billion years and allow us to explore the connection between this activity and the merger itself.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+19:59:28.30 +40:44:02.00 Cygnus A - Nucleus ACIS-I None 600.0
+19:59:22.80 +40:44:25.30 Cygnus A - W Hotspot ACIS-I None 600.0
+19:59:32.00 +40:43:40.40 Cygnus A - E Hotspot ACIS-I None 600.0
+19:59:12.60 +40:48:02.40 Cygnus A - Filament ACIS-I None 100.0
+19:58:47.60 +40:53:35.20 Cygnus A - NW Subcluster ACIS-I None 100.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700878

Title: Diffuse Extended Emission in Centaurus A: The best case with which to study AGN/Host Galaxy Interaction

Type: GO Total Time (ks): 100

PI Name: Alex Markowitz

Abstract: We request a 100 ks observation of Centaurus A, the nearest radio-loud AGN, using the LETGS gratings. Given its proximity, Centaurus A offers the highest spatial resolution (~100 pc scales), at which to investigate the role of AGN feedback into interstellar gas on sub-kpc scales in a radio-loud AGN. Chandra can isolate the extended diffuse emission from the absorbed nuclear component and the jet. We will determine the ionization mechanism (photo- versus collisional-), search for radiative recombination continua features, and obtain temperature and density diagnostics from He-like triplets.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+13:25:27.60 -43:01:09.00 Centaurus A ACIS-S LETG 100.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700901

Title: CONSTRAINING THE WIND-SHIELD SCENARIO OF PG 2112+059

Type: GO Total Time (ks): 40

PI Name: Cristian Saez

Abstract: The physical scenario describing the origin of quasar winds, still remains largely unsettled due to our failure to account for X-ray weak BALQSOs. In this proposal, we plan to study the relation between the inner part of the wind which is likely to be shielding the X-ray emission and the UV winds characterized by broad absorption lines (BALs). To address this, we propose to probe the shield-wind connection in the highly X-ray variable BALQSO PG 2112+059, which has exhibited periods of X-ray weakness and X-Ray "normality" in the past.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+21:14:52.60 +06:07:42.50 PG 2112+059 ACIS-S None 40.0

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 16700907

Title: Constraining the X-ray AGN Fraction Within Filaments of Galaxies

Type: GO Total Time (ks): 210

PI Name: Jimmy Irwin

Abstract: The fraction of galaxies hosting L_X > 10^41 ergs/s AGN is larger for groups than for the field or rich clusters by about a factor of two. While some studies suggest X-ray activity is indicative of galaxies that have recently fallen into clusters/groups, this claim has been difficult to test. Ideally, one would like to observe galaxies actively feeding forming groups via filaments. One example of a merging group being fed by identified filaments is the super-group Abell 1882 at z=0.14 which has at least four filaments feeding four galaxy sub-groups that are in the process of merging. We propose three pointings of Abell 1882's filament system to detect AGN to a limiting luminosity of 10^41 ergs/s to obtain the first determination of the X-ray AGN fraction in cluster-feeding filaments.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+14:14:38.40 -00:01:12.00 Abell1882 - Filament #1 ACIS-I None 70.0
+14:13:57.80 -00:17:07.60 Abell1882 - Filament #2 ACIS-I None 70.0
+14:12:50.20 -00:17:07.90 Abell1882 - Filament #3 ACIS-I None 70.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800086

Title: Perseus: A New, Low-Redshift Anchor for Cluster Cosmology

Type: GO Total Time (ks): 145

PI Name: Steven Allen

Abstract: The Perseus Cluster (z=0.0179) is the nearest, massive, highly dynamically relaxed galaxy cluster. We propose short (5ks/exposure) Grid Survey observations of the cluster to provide complete Chandra coverage out to 1.2r2500, and good coverage out to r500. The observations will permit a precise measurement of the X-ray gas mass fraction in the cluster, setting down a new, low-redshift anchor for dark energy studies with such measurements. By setting this anchor at the lowest redshift possible, the observations will provide easily the most cost-effective approach to boosting the constraining power of current data, and increasing the impact of future measurements at higher redshifts. The data will also provide a powerful legacy resource for general cluster science.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+03:19:48.00 +41:30:44.00 Perseus cluster ACIS-I None 125.0
+03:19:48.00 +41:30:44.00 Perseus cluster ACIS-I None 20.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800273

Title: Building the intra-group medium from shock heated HI in the NGC 5903 galaxy group

Type: GO Total Time (ks): 155

PI Name: Ewan O'Sullivan

Abstract: Observations of the famous shock in Stephan's Quintet suggest that low-mass galaxy groups may form a significant part of their IGM via shock heating of tidally stripped HI. Stephan's Quintet is, to date, unique, but we may have found a second nearby example. The NGC 5903 group hosts a 65kpc diameter diffuse ultra-steep spectrum radio source suggestive of shock emission, and a short XMM observation shows a strong correlation between a 100kpc HI filament and bright ridges of X-ray emission, indicating that the HI has been partially shock heated by a collision with the nearby elliptical NGC 5898. XMM lacks the spatial resolution to examine these complex structures, and we request a 155ks ACIS-S pointing to investigate what may be a key example of early IGM formation in a galaxy group.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+15:18:30.10 -24:05:29.50 NGC 5903 ACIS-S None 155.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800287

Title: Chandra Calibration of the Richness-Mass Relation of Galaxy Clusters: Enabling Cluster Cosmology with the DES

Type: GO Total Time (ks): 120

PI Name: Eduardo Rozo

Abstract: The abundance of galaxy clusters in the Dark Energy Survey (DES) will provide the definitive measurement of the growth of large scale structure of the next $\sim 5-10$ years. Realizing this promise, however, requires a calibration of the scatter in mass at fixed richness with uncertainties no larger than 5%. This level of precision can only be achieved with high resolution X-ray data. We propose 249 ksec of Chandra follow-up of 15 optically selected clusters to enable a 4% calibration of the above scatter. Our results will improve the dark energy Figure of Merit of the DES clusters by a factor of 2 relative to self-calibration analyses.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+11:36:13.00 +40:02:35.80 RM J113613.0+400235.8 ACIS-I None 14.0
+12:49:30.90 +49:49:02.30 RM J124930.9+494902.3 ACIS-I None 14.0
+12:34:16.10 +15:15:08.40 RM J123416.1+151508.4 ACIS-I None 8.2
+16:03:19.00 +03:16:44.60 RM J160319.0+031644.6 ACIS-I None 14.6
+23:07:07.50 +16:32:46.10 RM J230707.5+163246.1 ACIS-I None 5.8
+10:47:29.00 +15:14:02.10 RM J104729.0+151402.1 ACIS-I None 12.6
+13:34:08.70 +20:14:53.00 RM J133408.7+201453.0 ACIS-I None 7.0
+10:54:17.50 +14:39:04.20 RM J105417.5+143904.2 ACIS-I None 10.8
+10:17:34.30 +59:33:39.80 RM J101734.3+593339.8 ACIS-I None 7.6
+21:18:49.10 +00:33:37.20 RM J211849.1+003337.2 ACIS-I None 13.4
+16:43:25.40 +13:22:35.90 RM J164325.4+132235.9 ACIS-I None 12.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800330

Title: Search for the outer boundary of the starburst galaxy: M82

Type: GO Total Time (ks): 16

PI Name: Ka-Wah Wong

Abstract: We propose to carry out joint Chandra and Suzaku observations of the starburst galaxy M82. We will search for extended clumps similar to the Northern Cap out to 45 kpc. We will also constrain the density and temperature profiles of the tenuous wind emission out to large radii. These data can place important constraints on theoretical models of starburst galaxies and their environments. We will test models such as the Chevalier & Clegg adiabatic wind model, hydrostatic halo model, shocked clouds in a wind, etc. The excellent Chandra spatial resolution combining with the low Suzaku background allows this measurement.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+09:54:42.90 +70:03:13.20 M82 N1 ACIS-I None 16.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800337

Title: Low mach number shocks reaccelerating particles in the Intra-cluster Medium: the unique case of PLCKG287.0 +32.9

Type: GO Total Time (ks): 200

PI Name: Annalisa Bonafede

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+11:50:49.20 -28:04:37.00 PLCKG287+.0 +32.9 ACIS-I None 200.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800338

Title: An X-ray view of peculiar radio tails lacking optical counterparts in Abell 585

Type: GO Total Time (ks): 20

PI Name: Aurora Simionescu

Abstract: We propose a relatively short 20ks observation of the galaxy cluster Abell 585 at z=0.12, which currently lacks any XMM-Newton or Chandra coverage. Our recent analysis of archival VLA data of this cluster has revealed a peculiar type of diffuse radio emission, whose spectral and polarization properties are inconsistent with typical radio mini-haloes or relics; while these radio features closely resemble typical lobes of cluster radio galaxies, we have been unable to identify their host galaxies in available optical (SDSS) and infrared (WISE) surveys. In addition to our radio and optical follow-up of these intriguing features, we therefore propose to obtain complementary X-ray images which will further help us elucidate their nature.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+07:30:48.00 +40:51:10.00 Abell 585 ACIS-S None 20.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800359

Title: Ram-pressure stripping and ICM physics in an infalling galaxy group

Type: GO Total Time (ks): 200

PI Name: Dominique Eckert

Abstract: Ram-pressure stripped tails have been observed in a handful of individual interacting galaxies and are direct signatures of structure formation processes. We discovered a spectacular tail (>600 kpc long) of hot gas trailing behind an accreting group. This tail is the first in a galaxy group and it is longer than any known similar feature by a factor of 5. Because of its long survival (>700 Myr) and irregular morphology, this structure also provides us with a unique laboratory for the study of ICM physics. We propose a 200 ks observation of this accreting substructure with Chandra with the following aims: 1) characterize precisely its morphology; 2) determine the infall velocity and study the stripping processes; 3) provide constraints on transport processes and turbulence in the local ICM.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+15:59:02.60 +27:26:15.00 A2142 NE ACIS-S None 200.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800365

Title: A Cosmic Ray Mystery: No Shock Across a Radio Relic in ZwCl 2341.1+0000

Type: GO Total Time (ks): 197

PI Name: Georgiana Ogrean

Abstract: Galaxy cluster mergers trigger shocks in the ICM, which can accelerate particles to relativistic energies to form radio relics. Despite recent challenges, the standard diffusive shock acceleration model remains the most commonly used to explain the shock-relic connection. We have shown that the double-relic cluster ZwCl 2341 poses the greatest challenge to our current understanding of particle acceleration at merger shocks. We propose joint Chandra+JVLA observations of ZwCl 2341 to study the connection between the shocks and the relics. The proposed observations could deliver unprecedented proof that our understanding of the origin of radio relics is incomplete, and that non-linear effects are required to explain particle acceleration at weak shocks.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+23:43:36.80 +00:19:29.60 ZwCl 2341.1+0000 ACIS-I None 197.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800377

Title: The origin of the massive cold gas flows in the galaxy cluster A1664

Type: GO Total Time (ks): 200

PI Name: Helen Russell

Abstract: Powerful AGN outbursts pump a substantial amount of energy into their host galaxy clusters which keeps their atmospheres hot and suppresses gas cooling and star formation. Cold gas accretion onto the SMBH and AGN-driven molecular gas outflows, directly regulating the cold gas reaching the galaxy centre, are likely to be crucial elements of this feedback loop. Our ALMA observations of the brightest cluster galaxy in A1664 have revealed a circumnuclear molecular gas disk and a massive gas flow extending 10 kpc from the nucleus. Here we request a 200 ks Chandra observation of A1664 to map the X-ray properties on the same scale as the molecular gas structures, trace the rapidly cooling X-ray gas potentially feeding the disk and determine if the high velocity flow is driven by the AGN.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+13:03:42.60 -24:14:42.20 Abell 1664 ACIS-S None 200.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800411

Title: The Burst Cluster: Dark Matter in a Merging Cluster Host of the Short Gamma-Ray Burst GRB050509B

Type: GO Total Time (ks): 210

PI Name: Craig Sarazin

Abstract: We propose a 210 ks Chandra observation of ZwCl1234.0+02916 (z=0.2214), a merging galaxy cluster where one of the BCGs hosted the short GRB050509B. Our previous Chandra TOO shows a bimodal structure, with a possible cold front at the western edge, indicating that the two subclusters are moving away from one another after first core passage. Our weak lensing analysis shows that the dark matter is also bimodal, and is centered on the two galaxy distributions, while the X-ray gas lags behind (like the Bullet Cluster). Chandra data will confirm the bimodal structure and allow the measurement of the merger velocity and the study of the segregation of dark and baryonic matter. This is likely to be a high velocity collision which will constrain the self-interaction cross-section of dark matter.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+12:36:17.80 +28:59:15.00 ZwCl 1234.0+02916 ACIS-S None 210.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800415

Type: GO Total Time (ks): 87

PI Name: Megan Donahue

Abstract: We propose to observe 8 galaxy clusters associated with RASS Bright Sources, to follow our successful detection of 4 new luminous clusters in Cycle 15. None of these clusters, selected from the SDSS GMBCG catalog of 55,000 clusters, were previously known to be X-ray luminous clusters. These clusters may be missed by X-ray cluster surveys, as the Phoenix Cluster was, because of their association with bright point sources. Understanding objects like these and their underrepresentation in X-ray cluster surveys is important for accurately measuring the evolution of cool cluster cores and for understanding the connection between X-ray bright AGNs in brightest cluster galaxies and the ICM. We will address these issues by separating the AGN and extended X-ray contributions in these sources.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+11:31:20.90 +33:34:47.10 J113121.4+333447 ACIS-I None 15.0
+09:27:10.60 +53:27:31.60 RXCJ092710.8+532741 ACIS-I None 14.0
+09:09:53.30 +31:06:03.20 RXCJ090953.9+310558 ACIS-I None 5.0
+14:42:48.30 +12:00:40.30 RXCJ144248.5+120042 ACIS-I None 2.0
+08:28:14.20 +41:53:51.90 RXCJ082814.5+415359 ACIS-I None 16.0
+12:15:11.00 +07:32:04.60 RXCJ121510.9+073205 ACIS-I None 6.0
+17:06:00.50 +36:57:28.50 RXCJ170559.9+365732 ACIS-I None 25.0
+09:16:51.90 +52:38:28.40 RXCJ091651.8+523829 ACIS-I None 4.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800445

Title: Completing the survey of the most massive southern galaxy clusters

Type: GO Total Time (ks): 220

PI Name: Hans Boehringer

Abstract: With the recently completed REFLEX II galaxy cluster survey we obtained a new sample of the most X-ray luminous and most massive galaxy clusters comprising a total of 45 galaxy clusters (Lx>=6e44 erg/s) at z>=0.3 in the southern sky. The majority of these prominent clusters have been detected in various surveys and have been well studied in X-rays before, except for 8 clusters in our new sample. These clusters are the most interesting objects of this kind since they are prominent gravitational lensing objects, easily detected through the Sunyaev-Zeldovich effect, and important cosmological probes. To complete this sample of massive clusters, we propose Chandra observations with a total of 220 ks exposure to well characterize their global parameters and explore their morphology.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+00:18:57.10 -40:51:37.40 RXCJ0018.9-4051 ACIS-I None 30.0
+00:41:03.40 -44:28:33.20 RXCJ0041.0-4428 ACIS-I None 31.0
+01:38:03.00 -21:55:22.80 RXCJ0138.0-2155 ACIS-I None 25.0
+01:51:41.90 -29:00:37.10 RXCJ0151.6-2900 ACIS-I None 31.0
+02:19:53.10 -30:02:07.40 RXCJ0219.8-3002 ACIS-I None 10.0
+04:39:13.10 -46:00:54.40 RXCJ0439.2-4600 ACIS-I None 28.0
+05:14:22.90 -22:27:13.30 RXCJ0514.3-2227 ACIS-I None 30.0
+15:16:18.30 -27:37:48.00 RXCJ1516.3-2737 ACIS-I None 35.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800453

Title: High-Resolution Imaging of Newborn Shock Fronts in Nearby Early-Phase Merging Cluster CIZA J1358.9-4750

Type: GO Total Time (ks): 40

PI Name: Yuichi Kato

Abstract: We propose a 40 ks Chandra observation of a newly discovered near-by (z=0.07) merging cluster, CIZA J1358.9-4750. It has two X-ray humps 14 ks apart, with prominent bridge structure. Our Suzaku spectra identified a 9.1 keV hot belt in the middle of the bridge, which is 50 % higher than the temperature in the vicinity. Existing shallow (5 ks) XMM image also shows indication of surface brightness jump, although its shape is not clear especially to the west. The hot belt is resembles the prototypical newborn shock in the early major merger. With Chandra, we will determine the shock overall shape and also investigate the forward and reverse shock structure. We will combine the shock geometry with our Suzaku and radio observations and compare with our simulation to resolve the merger geometry.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+13:58:42.80 -47:45:09.40 CIZA J1358.9-4750 ACIS-I None 40.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800455

Title: Abell 3411: Confronting the Relic Shock Acceleration Mystery

Type: GO Total Time (ks): 165

PI Name: Reinout van Weeren

Abstract: In the merging cluster A3411 a shock is found coinciding with a radio relic. Relics are large structures tracing relativistic particles that are somehow accelerated at shocks. However, the acceleration efficiency of cluster merger shocks is thought to be very low. To solve this problem, re-acceleration of mildly relativistic particles has been invoked, but this idea has not been tested observationally. In A3411 we find two radio AGNs embedded in the relic. Together with the relic's morphology, this strongly suggests that AGN fossil electrons are re-accelerated by the shock. We thus propose Chandra+JVLA observations to directly address the following question: Do radio relics trace particles directly accelerated at shocks OR do they trace re-accelerated pre-existing fossil electrons?

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+08:41:58.50 -17:30:12.50 Abell 3411 ACIS-I None 165.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800461

Title: X-ray Imaging of a Gas Rich BCG in the RXJ0821.0+0752 Cluster

Type: GO Total Time (ks): 70

PI Name: Brian McNamara

Abstract: We propose a 70 ks Chandra observation of the RXJ0821.0+0752 galaxy cluster and its brightest galaxy (BCG). Harboring more than $10^{10}~\rm M_\odot$ of molecular gas, the BCG is among the most gas-rich galaxies known, and is thus a candidate ALMA Cycle 2 target. The Chandra observation is intended to map the cycle of atmospheric cooling into molecular clouds that may be fueling star formation and AGN feedback.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+08:21:02.20 +07:51:49.20 RXJ0821.0+0752 ACIS-S None 70.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800528

Title: The Highly Perturbed X-ray Bright Group NGC 5044

Type: LP Total Time (ks): 340

PI Name: Laurence David

Abstract: The NGC 5044 group is the X-ray brightest group in the sky and hosts many small X-ray cavities that were inflated by weak AGN outbursts. The cumulative effect of many weak AGN outbursts may be the dominant reheating mechanism in cooling flows. While AGN feedback probably prevents the bulk of gas from cooling in NGC 5044, the presence of molecular structures, H$\alpha$ filaments, [CII] emission and star formation indicates that at least some gas is able to condense out of the hot phase. The near by 5044 group is the best target for detecting small X-ray cavities with Chandra and investigating the cumulative effect of repeated weak AGN outbursts. The wealth of multi-frequency data also makes NGC 5044 an ideal target for studying gas over a broad range of temperatures in a cooling flow.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+13:15:24.00 -16:23:07.00 NGC 5044 ACIS-S None 340.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800593

Title: The unexpected SZ structure of the extreme cool core in the galaxy cluster RXCJ1504

Type: GO Total Time (ks): 110

PI Name: Simona Giacintucci

Abstract: A massive, relaxed galaxy cluster RXJ1504 hosts an extremely luminous cool core. We recently obtained a Sunyaev-Zeldovich map of RXJ1504 core with CARMA at 12" and 44" resolutions to study the distribution of its gas pressure. While there is large-scale agreement, we found that the peak of the SZ signal does not coincide with the X-ray peak, but instead sits at the tip of a subtle sloshing gas filament. Theoretically, it is very difficult to generate small-scale pressure nonuniformities in a non-merging cluster; something significant must be missing from our understanding of the cool core physics. Several interesting possibilities exist. We propose to obtain a better-resolved temperature map of this SZ peak with an additional longer Chandra exposure to look for the missing pressure peak.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+15:04:07.50 -02:48:16.00 RXCJ1504.1-0248 ACIS-I None 110.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800596

Title: NGC 741: Mergers and AGN feedback at the group scale

Type: GO Total Time (ks): 160

PI Name: Jan Vrtilek

Abstract: While AGN and mergers are thought to play important roles in group and cluster evolution, their effects in galaxy groups are poorly understood. We propose to observe the NGC 741 group, which hosts both an old central radio galaxy, and a spectacular infalling head-tail source. Strongly-bent jets, a 100kpc radio trail and intriguing narrow X-ray filaments suggest that NGC 742 is moving trans-sonically, undergoing stripping and shock heating. NGC 741 possesses both an old, faint radio lobe and an X-ray cavity, whose inflating plasma may have unusual properties. We request Chandra and XMM observations of the group with the goal of examining the roles of the central AGN and infalling galaxy in heating the intra-group medium, and determining the origin of the intriguing X-ray filaments.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+01:56:21.00 +05:37:44.20 NGC 741 ACIS-S None 160.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800622

Title: Probing the Physics of the ICM in the Dynamically Young Cluster A1367

Type: LP Total Time (ks): 370

PI Name: William Forman

Abstract: We propose a 370 ks ACIS-I observation to measure the surface brightness fluctuations in the core of A1367, a dynamically young and low temperature cluster, to probe the ICM microphysics including fundamental processes such as thermal conduction and viscosity. The key is to extend the dynamic range of the power spectrum and measure the amplitude of fluctuations on scales comparable to (or below) 10 kpc. We also will exploit cross-power-spectra of fluctuations in different energy bands and compare relative amplitudes of perturbations in these bands at different spatial scales to reveal the nature of perturbations, discriminating between adiabatic (e.g. perturbations of the gravitational potential and sound waves) and entropy perturbations.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+11:44:44.40 +19:42:04.00 Abell 1367 ACIS-I None 370.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800637

Title: THERMAL AND (OR?) RELATIVISTIC MATTER IN THE BRIGHTEST CLUSTER RADIO RELIC

Type: GO Total Time (ks): 200

PI Name: Maxim Markevitch

Abstract: We propose deep Chandra imaging of the iconic radio relic at the northwestern periphery of A3667 - the brightest relic in the sky. Faint diffuse X-ray emission detected there by XMM and Suzaku may come from thermal plasma or have contribution from inverse Compton (IC) scattering by the radio-emitting relativistic electrons. The radio data show a network of narrow, polarized filaments, offering a unique test to distinguish between these possibilities using high-resolution X-ray imaging. The magnetic pressure should approach thermal pressure in the relic region. If the X-ray brightness is spatially correlated with the radio filaments, it is the long-sought IC signal; if anticorrelated, it is the plasma depletion effect by the strong magnetic fields in the filaments embedded in thermal gas.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+20:10:20.50 -56:25:58.00 A3667_NWRELIC_1 ACIS-I None 100.0
+20:10:12.10 -56:27:43.00 A3667_NWRELIC_2 ACIS-I None 100.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800665

Title: Exciting Shock Physics in Faint Galaxy Cluster Outskirts

Type: GO Total Time (ks): 26

PI Name: Reinout van Weeren

Abstract: We are constructing the first sample of galaxy cluster merger shocks with radio relics. This sample will be used to address the unsolved and fundamental problem of particle acceleration at low-Mach number shocks. We have been awarded a Suzaku Key Project to measure the temperatures across these radio relic shocks, in the faint outskirts of clusters. Here we propose short Chandra observations to greatly reduce the systematic uncertainty due to fluctuations in the unresolved source background. This systematic uncertainty severely affects our low-resolution Suzaku observations and prevents us from obtaining accurate shock Mach numbers. Having this information is crucial to solve the mystery of efficient particle acceleration at low-Mach number shocks in dilute cosmic plasmas.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+00:12:30.00 +52:36:40.00 ZwCl 0008.8+5215 WEST ACIS-I None 6.5
+00:11:05.00 +52:31:25.00 ZwCl 0008.8+5215 EAST ACIS-I None 6.5
+22:42:30.00 +52:55:60.00 CIZA J2242.8+4301 SOUTH ACIS-I None 6.5
+10:52:40.00 +54:54:40.00 RXC J1053.7+5452 WEST ACIS-I None 6.5

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800690

Title: A MASS-LIMITED SURVEY OF GALAXY CLUSTERS AT 1.2 < z < 1.7: PROBING THE PHYSICS OF THE ICM DURING ITS ASSEMBLY

Type: LP Total Time (ks): 588

PI Name: Michael McDonald

Abstract: We propose to obtain Chandra X-ray observations of a mass-limited sample of 8 galaxy clusters at 1.2 < z < 1.7. This sample complements a recently-completed survey of the 80 most massive SPT-selected clusters at 0.4 < z < 1.2 by extending the survey to the most distant, high-significance clusters detected with the South Pole Telescope (SPT). The addition of 8 clusters at z > 1.2 would allow us to probe galaxy cluster evolution out to the earliest epochs of cluster formation, at an epoch when star formation, cluster-cluster merging, satellite accretion, and AGN activity were all significantly higher than they are today. This unique sample will provide the seeds for follow-up surveys of high-redshift clusters for years to come.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+23:41:25.70 -57:24:56.90 SPT-CLJ2341-5724 ACIS-I None 116.0
+06:40:15.60 -51:13:13.40 SPT-CLJ0640-5113 ACIS-I None 89.0
+06:07:35.60 -44:48:11.90 SPT-CLJ0607-4448 ACIS-I None 116.0
+04:59:42.50 -49:47:13.90 SPT-CLJ0459-4947 ACIS-I None 144.0
+03:13:55.40 -53:34:41.20 SPT-CLJ0313-5334 ACIS-I None 123.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800711

Title: A first look at the most powerful radio relic cluster

Type: GO Total Time (ks): 27

PI Name: Francesco de Gasperin

Abstract: We propose a 27 ks observation of the galaxy cluster PSZ1 G108.18-11.53. This distant (z=0.332) cluster hosts a newly discovered giant double radio relic system and a radio halo. The relic system is the second largest ever found, and it contains the most powerful known relic. The proposed exploratory observation will collect 5000 cts, enough to characterize the dynamical state of the cluster, to measure its global physical properties, and to detect possible density discontinuities in the ICM. The proposed observations are essential for planning deeper X-ray follow-ups, and for modeling this unique merger event using hydrodynamical simulations.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+23:22:29.70 +48:46:30.00 PSZ1 G108.18-11.53 ACIS-I None 27.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800758

Title: DISTANT GALAXY CLUSTERS HOSTING EXTREME CENTRAL GALAXIES

Type: GO Total Time (ks): 153

PI Name: Michael McDonald

Abstract: The recently-discovered Phoenix cluster harbors the most star-forming central cluster galaxy of any cluster in the known Universe, by nearly a factor of 10. This extreme system appears to be fulfilling early cooling flow predictions, although the lack of similar systems makes any interpretation difficult. In an attempt to find other "Phoenix-like" clusters, we have cross-correlated archival all-sky surveys (in which Phoenix was detected) and isolated 4 similarly-extreme systems which are also coincident in position and redshift with an overdensity of red galaxies. We propose here to obtain Chandra observations of these extreme, Phoenix-like systems, in order to confirm them as relaxed, rapidly-cooling galaxy clusters.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+13:56:05.40 -34:21:10.90 PKS1353-341 ACIS-I None 31.0
+17:27:22.10 +55:10:49.00 RXJ1727.3+5510 ACIS-I None 35.0
+23:34:12.80 +07:36:27.60 CGRaBS J2334+0736 ACIS-I None 35.0
+22:54:44.50 +13:44:29.30 NVSS J225444+134429 ACIS-I None 52.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800783

Title: First Chandra Observation of a remarkable 'String of Pearls' between two Merging Elliptical Galaxies

Type: GO Total Time (ks): 130

PI Name: Stefi Baum

Abstract: We propose a 130 ksec Chandra observation of two merging giant elliptical galaxies in the core of a strongly lensing galaxy cluster at z=0.335. The merger is gas rich, featuring a dramatic 30 kpc chain of "beads on a string" star formation wrapping around the nuclei of the merging host galaxies. The proposed X-ray observations will (1) determine whether or not there may be an X-ray cool core powering the star formation as cold gas condenses from the hot ambient X-ray atmosphere; (2) search for X-ray signatures (shocks and cold fronts) of a merger of two clusters, which may give rise to shock-driven star formation; (3) use the X-ray data to rule out the former two scenarios, instead providing X-ray constraints on a rare and dramatic gas-rich merger of two giant elliptical galaxies.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+15:31:10.60 +34:14:25.00 SDSS J153110.59+341425.0 ACIS-S None 130.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800794

Title: Investigating a Potential Benchmark of Relaxed Clusters out to the Virial Radius

Type: GO Total Time (ks): 10

PI Name: Yuanyuan Su

Abstract: We recently published a Suzaku study of ESO~3060170, the X-ray brightest fossil group," out to its virial radius. Its entropy profile rises roughly linearly with radius to 0.8 r_vir, then declines beyond r_vir. We propose to test whether this outer decline in entropy is an artifact of background uncertainties with Chandra ACIS-I. A better-constrained background will allow us to confirm whether the entropy profile indeed flattens beyond r_vir; if so, this will imply that clumpy gas occurs not just in massive clusters, but down to the scale of galaxy groups; if not, this result will point to fossil groups as being relaxed, highly evolved systems all the way out to their virial radii.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+05:40:08.20 -41:14:11.80 ESO 3060170 Offset ACIS-I None 10.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800805

Title: PKS B1400-33 and Abell S753: A Very Bright Radio Relic in a Poor Cluster

Type: GO Total Time (ks): 94

PI Name: Craig Sarazin

Abstract: The cluster radio relic PKS B1400-33 in the poor cluster Abell S753 will be observed with Chandra and the JVLA to detect and image the merger shock and nonthermal emission. This is the second brightest cluster radio relic known. Remarkably, it is associated with a relatively poor, cool cluster. With Chandra, we will detect the associated merger shock, and determine its compression, temperature jump, speed, and Mach number. The JVLA observations, 20 times deeper than existing data, will give the spectral curvature, and will test alternative ideas that the relic is an old radio lobe or due to a cluster accretion shock. These observations will be a strong test of merger shock acceleration, and will give the magnetic field, nonthermal energy, and shock acceleration efficiency.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+14:04:29.80 -34:00:38.70 Abell S753 ACIS-I None 94.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800829

Title: Chandra mapping of the cosmic web converging on the virialization region of Abell 1795

Type: XVP Total Time (ks): 2100

PI Name: Alexey Vikhlinin

Abstract: Detailed observations of the "cosmic melting pot" in the virialization zone of rich galaxy clusters are a fairly new territory for the physics of clusters and the intergalactic medium. The first step has been taken with a deep Chandra study of A133, which has provided a uniquely detailed picture of the Cosmic Web converging onto the cluster virial radius and demonstrated that Chandra can probe to fainter surface brightness levels than any other X-ray observatory now operating. Many of the results from the A133 observation are potentially game-changers for our understanding of the virialization region and its proper modeling. We now need to follow this up with a similarly deep observation of at least one more cluster.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+13:48:52.30 +26:35:36.20 Abell 1795 outskirts ACIS-I None 2100.0

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 16800848

Title: Chandra observations of the massive galaxy cluster MACS J1447.4+0827 at z=0.3755

Type: GO Total Time (ks): 70

PI Name: Julie Hlavacek-Larrondo

Abstract: We propose to obtain deep Chandra observations of MACS J1447.4+0827 (70ks), a luminous, dynamically relaxed, cool core cluster of galaxies harboring one of the most extreme Brightest Cluster Galaxies (BCGs) known. The BCG is ultra luminous in the infrared; has one of the most massive molecular gas detections known; as well as an extensive array of H$\alpha$ filaments. This object is exceptional, and provides a unique opportunity for studying the heating and cooling balance in clusters. We also find evidence of a giant cavity (but deeper X-ray data are needed to confirm the structure). By adding 70 ks to the data, we will increase the exposure by almost an order of magnitude. This will also allow us to derive precise X-ray mass estimates which we will compare to weak-lensing mass estimates.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+14:47:25.90 +08:28:23.50 MACS J1447.4+0827 ACIS-I None 70.0

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 16900624

Title: A Chandra/HST survey of dark gamma-ray bursts

Type: TOO Total Time (ks): 30

PI Name: Andrew Levan

Abstract: Dark gamma-ray bursts (GRBs) -- where the optical emission is apparently suppressed -- can only be reliably localized by their X-ray afterglows. Here we propose to continue a survey using the sensitivity and point spread function of Chandra to precisely pinpoint the GRB locations, and HST to locate and study the host galaxies. Our results to date are suggestive of most dark GRBs originating in more luminous galaxies than "bright" GRBs. Our new observations will increase the statistical certainty of this result, while simultaneously allowing us to more precisely identify the minority of dark GRBs which most likely originate from the highest redshifts.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+00:00:00.00 +00:00:00.00 DARK-GRB1 ACIS-S None 15.0
+00:00:00.00 +00:00:00.00 DARK-GRB2 ACIS-S None 15.0

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 16900937

Title: Black Hole Fingerprints from Cosmic Dawn to Cosmic Noon

Type: XVP Total Time (ks): 1250

PI Name: Guenther Hasinger

Abstract: A tantalizing large-scale correlation signal between the residual Cosmic X-ray and IR backgrounds observed in the EGS may be a fingerprint of the first BH population emerging from the Dark Ages as progenitors of SMBH, whose obscured growth is reflected in the XRB. We propose a 1.25Ms Chandra survey of the UDS, the second field observed by Spitzer with comparable depth and homogeneity, but better geometry. This will yield (1) an improvement by a factor 2.5 of the SNR (to about 8 sigma) at the angular scales of ~1000", crucial to estimate the nature and epoch of the X-ray sources correlated with the CIB; and (2) increasing the number of reliably identified luminous Compton-thick AGN to ~100 (2x), yielding the first robust X-ray evolution for CTAGN alone in 3 redshift bins.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+02:17:34.10 -05:10:14.40 UDS ACIS-I None 1250.0

Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 16910519

Title: Characterizing past outbursts from Sagittarius A*

Type: GO Total Time (ks): 480

PI Name: Maica Clavel

Abstract: We propose a Chandra three-cycle observation for a total of 480 ks to follow the echo of Sgr A*'s past flares in the molecular clouds of the region near Sgr A*. This observation with Chandra's unequaled spatial resolution is required to advance the characterization of both the temporal and spatial variations occurring in the region. It will permit us to significantly extend our recent analysis which suggests that at least two distinct events are propagating through the Galaxy's central molecular zone. The objective of this project is to reconstruct Sgr A*'s past lightcurve by measuring the intrinsic duration and luminosity of the distinct events. The additional time baseline will bring us closer to conclusively establishing the mechanisms at the origin of these past events.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+17:46:14.10 -28:54:52.50 Sgr A complex 1 ACIS-I None 240.0
+17:46:09.60 -28:53:43.80 Sgr A complex 2 ACIS-I None 240.0

Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 16910568

Title: Localizing NuSTAR-Discovered Sources in the Galactic Plane

Type: TOO Total Time (ks): 20

PI Name: John Tomsick

Abstract: The NuSTAR satellite operates in the 3-79 keV band with unprecedented angular resolution for a hard X-ray instrument. In addition to improved imaging and better source localizations, this leads to detection sensitivities that are orders of magnitude lower than previous hard X-ray satellites, and a main NuSTAR goal is to study populations of >10 keV sources in the Galaxy. Despite the improvement in source localization, the NuSTAR positions are still not sufficient for a unique identification of counterparts at other wavelengths (e.g., near-IR) especially in the Galactic Plane. Thus, we propose a Chandra TOO program to follow-up future sources discovered by NuSTAR in order to obtain a sub-arcsecond position and determine their nature.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
NuSTAR Transient #1 ACIS-S None 10.0
NuSTAR Transient #2 ACIS-S None 10.0

Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 16910752

Title: The Local Leo Cold Cloud: Separating Solar Wind Charge Exchange from Local Bubble X-ray Emission

Type: GO Total Time (ks): 150

PI Name: Jonathan Slavin

Abstract: The Local Leo Cold Cloud is a dense and cold (T ~ 20 K) cloud that lies within 24 pc of the Sun, well within the Local Bubble. The cloud has been thoroughly mapped in HI and has column densities ranging up to 1.E20 cm^-2, thus making it a prime candidate to make shadows in the diffuse X-ray emission coming from more distant regions of the Local Bubble and the Galactic halo. In addition, the cloud lies near the ecliptic plane which allows for viewing it while looking through the enhanced region of solar wind charge exchange emission known as the helium focusing cone. We intend to exploit these characteristic of the cloud by observing toward it two times, once through the focusing cone and once not. In this way we aim to disentangle distant diffuse emission and heliospheric X-rays.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+09:42:42.00 +12:24:28.80 Local Leo Cold Cloud ACIS-S None 150.0

Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 16910820

Title: Follow-up of Serendipitous NuSTAR Sources in the Galactic Plane

Type: GO Total Time (ks): 29

PI Name: John Tomsick

Abstract: In order to study the populations of hard (3-79 keV) sources, we have carried out a search of NuSTAR observations that have been carried out during the first 1.5 years of the mission. Due to the sensitivity of NuSTAR, this is extending to lower flux levels than previous surveys. Once a serendipitous NuSTAR source is found, we are obtaining optical/NIR spectra for identifications. For high Galactic latitudes, we have been able to identify unique counterparts. However, close to the Galactic plane, source confusion is an issue. We have selected 4 serendips within 12 degrees of the Galactic Plane, which have multiple candidate counterparts. We propose Chandra observations of these serendips to localize the sources and to compare their fluxes to archival soft X-ray measurements.

R.A. Dec. Target Name Det. Grating Exp. Time (ks)
+20:24:21.70 +33:50:51.00 3XMM J202421.7+335050 ACIS-S None 13.0
+14:54:40.20 -51:35:18.60 Swift J145440.2-513518 ACIS-S None 5.0
+17:28:05.70 -14:21:09.30 3XMM J172805.7-142109 ACIS-S None 5.0
+17:27:51.40 -14:14:39.50 3XMM J172751.4-141439 ACIS-S None 6.0