Accepted Cycle 15 Observing Proposals

Proposal Number	Subject Category	PI Name	Type	Time (ks)	Title
15100276	SOLAR SYSTEM	Kraft	GO	160	Plasma in the Jovian magnetosphere: An X-ray and EUV study of the aurora and the Io plasma torus
15100583	SOLAR SYSTEM	Lisse	GO	86	Plumbing the Heights of the Solar Wind With Comet ISON
15100843	SOLAR SYSTEM	McNutt	GO	35	Chandra Observations of Pluto's Escaping Atmosphere in Support of the New Horizons Mission
15200114	STARS AND WD	Mauerhan	GO	12	CHANDRA X-RAY OBSERVATIONS OF THE ETA CAR ANALOG NAST1 (WR 122): IS IT A COLLIDING-WIND BINARY?
15200163	STARS AND WD	Beiersdorfer	GO	95	High-Resolution Observations of Procyon's Fe L-shell Soft X-ray Emission
15200243	STARS AND WD	Green	GO	104.6	Rejuvenation of the Innocent Bystander: Testing Spin-Up in Dwarf Carbon Stars
15200307	STARS AND WD	Pooley	TOO	50	Catching an FUor in the Act: Chandra ToO Observations of Extreme Accretion onto Young Stars
15200333	STARS AND WD	Torrejon	GO	80	The eye of the hurricane. Exploring the innermost wind region of the massive star QV Nor.
15200353	STARS AND WD	Stelzer	GO	50	X-rays from the most nearby brown dwarf, WISE1049-5319
15200426	STARS AND WD	Schulz	GO	135	Wind Properties in a Very Young Pup
15200435	STARS AND WD	Salz	GO	60	X-ray irradiation of planets with atmospheres amenable to comprehensive follow-up
15200448	STARS AND WD	Guenther	GO	10	Can X-rays clear a circumstellar disk in 2 years?
15200476	STARS AND WD	Sahai	GO	70	INVESTIGATING BINARITY AND ACTIVE ACCRETION IN A NEW CLASS OF AGB STARS WITH FUV EXCESSES
15200512	STARS AND WD	Poppenhaeger	GO	141	Do exoplanets spin up their host stars?
15200514	STARS AND WD	SKINNER	GO	120	Coronal and Shock Emission in the Accreting T Tauri Star RY Tau
15200523	STARS AND WD	Kuhn	GO	40	Investigating Star-Formation in the Filaments and Bubble of IC 5146
15200539	STARS AND WD	Brown	GO	140	Measuring the X-ray Emission Impacting the Planets Orbiting Nearby Low-mass Stars
15200550	STARS AND WD	Melis	GO	25	X-ray Emission from a Radio-Loud Hyperactive L Dwarf
15200565	STARS AND WD	Brickhouse	LP	600	Accretion-Driven Physics on the Young Star BP Tauri
15200579	STARS AND WD	Wolk	GO	30	A Snapshot Survey of the Most Active Hot Jupiter Systems.
15200608	STARS AND WD	Petit	GO	125	Testing the wind-shock paradigm for B-type star X-ray production with theta Carinae (B0.2V)
15200662	STARS AND WD	Hamaguchi	GO	160	Probing the wind/radiative interactions with the circumstellar material at Periastron Passage of Eta Carinae
15200684	STARS AND WD	Kashyap	GO	25	X-Raying the Scorpion's Heart
15300309	WD BINARIES AND CV	Pooley	GO	50	Determining the Nature of an 18-minute UV source in NGC 1851
15300487	WD BINARIES AND CV	Montez	GO	60	Probing Shocks of the Young Planetary Nebula NGC 7027
15300552	WD BINARIES AND CV	Starrfield	TOO	85	A Fermi/LAT Trigger of Grating Observations of One Bright Nova in Outburst
15300607	WD BINARIES AND CV	Takei	GO	8	Spatial Diagnostics of Potential X-ray Remnants in Old Novae T Aur and DK Lac
15300811	WD BINARIES AND CV	Takei	GO	100	X-ray Diagnostics of Evolving Nova Remnant in GK Per
15300872	WD BINARIES AND CV	Nelson	TOO	100	Probing mass ejection in novae with high resolution X-ray spectroscopy
15400074	BH AND NS BINARIES	Paizis	TOO	40	INVESTIGATING NEW INTEGRAL SOURCES WITH Chandra
15400089	BH AND NS BINARIES	Pottschmidt	TOO	24	Filling the gap in understanding the wind structure of HDE 226868 /Cyg X-1
15400135	BH AND NS BINARIES	Bogdanov	GO	200	A DEEP SUBARRAY EXPOSURE OF X7 IN 47 TUC: TOWARDS CONSTRAINING NEUTRON STAR STRUCTURE
15400162	BH AND NS BINARIES	Miller	GO	100	Chandra Spectroscopy of a Remarkable Neutron Star
15400216	BH AND NS BINARIES	Degenaar	GO	105	Observing a cooling neutron star crust in Terzan 5
15400240	BH AND NS BINARIES	Chakrabarty	TOO	4	Precise Localization of Transient Low-Mass X-ray Binaries
15400249	BH AND NS BINARIES	Diaz Trigo	TOO	100	A study of the relativistic jet of 4U 1630-47
15400260	BH AND NS BINARIES	Maccarone	GO	150	Searching for a Metallicity Effect in Field X-ray Binaries
15400298	BH AND NS BINARIES	Chomiuk	GO	87	A Black Hole in the Galactic Globular Cluster M62
15400302	BH AND NS BINARIES	Pooley	TOO	45	Transient LMXBs in Globular Clusters
15400308	BH AND NS BINARIES	Chakrabarty	GO	130	LETGS Spectroscopy of the Ultracompact Binary 4U 1626-67
15400315	BH AND NS BINARIES	GRENIER	TOO	30	ToO observation of a bright Galactic transient discovered by Fermi and Swift
15400317	BH AND NS BINARIES	Corbel	TOO	150	X-Ray Jets in Microquasars
15400330	BH AND NS BINARIES	Jonker	GO	13	Does Holmberg II X-1 harbor an intermediate-mass black hole?
15400346	BH AND NS BINARIES	Reig	TOO	450	X-ray pulsars at very low mass accretion rates
15400408	BH AND NS BINARIES	Marshall	GO	150	SS 433 Jet Formation
15400412	BH AND NS BINARIES	Cackett	LP	300	A Definitive Test of Relativistic Disk Lines in Neutron Stars
15400459	BH AND NS BINARIES	Plotkin	GO	26	A mutiwavelength probe of black hole accretion flows in quiescence
15400471	BH AND NS BINARIES	Heida	GO	60	CXOU J122518.6+144545: Type IIn supernova or hyperluminous X-ray source?
15400475	BH AND NS BINARIES	Oskinova	TOO	120	Chandra's study of the slow pulsar SXP1062 associated with a young SNR in the SMC
15400517	BH AND NS BINARIES	Tomsick	GO	50	The Nature of INTEGRAL Sources in the Galactic Plane
15400524	BH AND NS BINARIES	in 't Zand	TOO	100	Search for absorption edges in superexpansion bursts
15400528	BH AND NS BINARIES	Plotkin	TOO	135	Following a black hole X-ray transient as it transitions to quiescence
15400714	BH AND NS BINARIES	Hynes	GO	25	Confirmation of the Symbiotic Nature of CXOGBS J173620.2-293338
15400856	BH AND NS BINARIES	Homan	GO	115	The cooling neutron star in the super-Eddington accretor XTE J1701-462
15400867	BH AND NS BINARIES	Heinz	TOO	180	Turning Down the Noise on Circinus X-1: A Deep Look at the Jets, Shocks, and Lobes at Low Background
15400870	BH AND NS BINARIES	Chakrabarty	TOO	150	Narrow Lines from a Slowly Rotating Neutron Star
15400871	BH AND NS BINARIES	Steiner	GO	150	Confronting IC 10 X-1: Does the Most Massive Stellar Black Hole Also Have the Most Extreme Spin?
15400876	BH AND NS BINARIES	Farrell	GO	40	Resolving a New Hyper-luminous X-ray Source in NGC 1511
15400896	BH AND NS BINARIES	Canizares	GTO/TOO	150	High-resolution X-ray spectroscopy of the X-ray burster and 11 Hz pulsar IGR J17480-2446
15500072	SN, SNR AND ISOLATED NS	Halpern	GO	30	Measuring the Proper Motion of the Quiet Pulsar Calvera
15500090	SN, SNR AND ISOLATED NS	Halpern	GO	99	A Fifteen-Year Ephemeris for the CCO Pulsar in Puppis A
15500152	SN, SNR AND ISOLATED NS	Fong	TOO	60	Measuring the Explosion Geometry of Short GRBs: Implications for Energetics and Rates
15500155	SN, SNR AND ISOLATED NS	Burrows	GO	150	CHANDRA CYCLE 15 SPATIAL AND SPECTRAL MONITORING OF SN 1987A
15500176	SN, SNR AND ISOLATED NS	Tiengo	TOO	70	Measuring magnetar distance from the dust echo of a bright burst
15500190	SN, SNR AND ISOLATED NS	Weisskopf	TOO	70	Pre-Planned Target of Opportunity (ToO) Observations of the Crab Nebula upon the Occurrence of the Next Gamma-Ray Flare
15500198	SN, SNR AND ISOLATED NS	Weisskopf	GO	120	Joint Chandra and HST Monitoring and Studies of the Crab Nebula
15500264	SN, SNR AND ISOLATED NS	Maccarone	TOO	40	Calcium rich transients: tidal detonations of white dwarfs?
15500269	SN, SNR AND ISOLATED NS	Maccarone	GO	30	SN 2012hn: a tidal detonation event?
15500319	SN, SNR AND ISOLATED NS	Chandra	TOO	80	Tracing the X-ray emission from Type IIn supernovae
15500322	SN, SNR AND ISOLATED NS	Ofek	TOO	60	Testing the shock interaction hypothesis for hydrogen-poor super luminoius supernova
15500363	SN, SNR AND ISOLATED NS	Kaspi	TOO	105	Target-of-Opportunity Chandra Observations of Glitching High-B Radio Pulsars: Searching for Magnetar Metamorphoses
15500376	SN, SNR AND ISOLATED NS	Chandra	GO	40	The remarkable X-ray evolution of SN 2010jl
15500421	SN, SNR AND ISOLATED NS	Bernardini	GO	40	Unveiling the nature of cyclical behavior in the period evolution of the Anomalous X ray Pulsar XTE J1810-197
15500430	SN, SNR AND ISOLATED NS	Sakamoto	TOO	40	Identification of the Host Galaxy of Swift Short GRBs by the Chandra Sub-arcsecond Position
15500437	SN, SNR AND ISOLATED NS	Rea	TOO	85	PROMPT STUDY OF MAGNETAR OUTBURSTS WITH CHANDRA
15500567	SN, SNR AND ISOLATED NS	De Luca	GO	100	DEEP CHANDRA IMAGING OF THE GAMMA-RAY ONLY PULSAR PSR J1135-6055 AND ITS BENT JETS
15500573	SN, SNR AND ISOLATED NS	Slane	GO	30	Following the Temperature of a Neutron Star
15500577	SN, SNR AND ISOLATED NS	Gotthelf	GO	63	Where Have All The Central Compact Objects Gone?
15500590	SN, SNR AND ISOLATED NS	Troja	TOO	120	The collimation and energetics of short gamma-ray bursts
15500612	SN, SNR AND ISOLATED NS	Kaspi	GO	90	What is the Magnetic Field of Magnetar Swift J1822.3-1606?
15500616	SN, SNR AND ISOLATED NS	Racusin	TOO	120	Constraining the Energetics of Fermi-LAT GRBs with Chandra
15500621	SN, SNR AND ISOLATED NS	Williams	GO	150	Dynamics of a Type Ia SNR: Proper Motions in Tycho
15500730	SN, SNR AND ISOLATED NS	Dwarkadas	GO	115	REVISITING TWO OF THE BRIGHTEST TYPE IINS: HOW THE MIGHTY ARE FALLING - AND PERHAPS RISING AGAIN
15500737	SN, SNR AND ISOLATED NS	Ray	TOO	160	State of the shocked plasma: X-ray and radio signatures from type IIP supernovae
15500763	SN, SNR AND ISOLATED NS	Borkowski	GO	150	Dynamics of the Remnant of Kepler's Type Ia Supernova
15500831	SN, SNR AND ISOLATED NS	Soderberg	TOO	20	The Energetics and Environments of Type Ibc Supernovae
15500874	SN, SNR AND ISOLATED NS	Pavan	GO	250	DEEP STUDY OF THE 20PC-LONG PRECESSING JET IN IGR J11014-6103
15500895	SN, SNR AND ISOLATED NS	Fruchter	TOO	120	The Astrophysics of the Most Energetic Gamma-Ray Bursts
15610373	NORMAL GALAXIES: DIFFUSE EMISSION	Walker	GO	100	Detecting the hot gaseous halo around an extremely massive and relativistic jet launching spiral galaxy
15610450	NORMAL GALAXIES: DIFFUSE EMISSION	Bregman	GO	120	The Missing Baryons Around Early-Type Galaxies
15610544	NORMAL GALAXIES: DIFFUSE EMISSION	Bogdan	GO	170	Hot X-ray Coronae: A Unique Probe of Galaxy Formation Models
15610735	NORMAL GALAXIES: DIFFUSE EMISSION	Machacek	GO	240	A Study of Hydrodynamic Instabilities in the Major Merger of Galaxy Groups NGC7618 and UGC12491
15610786	NORMAL GALAXIES: DIFFUSE EMISSION	Irwin	GO	155	A First Look at Giant Bulge-Dominated Low-Surface Brightness Galaxies
15620082	NORMAL GALAXIES: X-RAY POPULATIONS	Thuan	GO	85	[NeV] Emission and Ultraluminous X-ray Sources in Two Low-metallicity Blue Compact Dwarf Galaxies
15620105	NORMAL GALAXIES: X-RAY POPULATIONS	Kaaret	GO	94.8	X-Rays from Lyman Break Analogs
15620465	NORMAL GALAXIES: X-RAY POPULATIONS	Hornschemeier	GO	75	0.5-30 KEV IMAGING OF STARBURSTS WITH CHANDRA AND NUSTAR
15620687	NORMAL GALAXIES: X-RAY POPULATIONS	Lin	GO	60	Chandra Observation of the Most Luminous Off-nuclear Intermediate-mass Black Hole Candidate
15620745	NORMAL GALAXIES: X-RAY POPULATIONS	Binder	GO	130	The Effect of Intermediate-Luminosity Transients on the X-ray Luminosity Functions of Spiral Disks
15620749	NORMAL GALAXIES: X-RAY POPULATIONS	Zepf	GO	75	Long-term X-ray and Optical Study of the Black Hole X-ray Binaries in the Elliptical Galaxy NGC 4472
15620805	NORMAL GALAXIES: X-RAY POPULATIONS	Lehmer	GO	112	TESTING THE UNIVERSALITY OF THE STELLAR IMF USING CHANDRA
15620853	NORMAL GALAXIES: X-RAY POPULATIONS	Haggard	LP	420	Monitoring the Tidal Disruption of the Gas Cloud G2 As It Encounters Sgr A*
15700077	ACTIVE GALAXIES AND QUASARS	Brandt	GO	60	The Variable Absorption and Disrupting X-ray Jet of the Broad Absorption Line Radio-Loud Quasar PG 1004+130
15700078	ACTIVE GALAXIES AND QUASARS	Harris	TOO	35	Triggering Chandra to Detect an X-ray Counterpart to TeV Flaring from M87 During Cycle 15
15700081	ACTIVE GALAXIES AND QUASARS	Harris	GO	10	Keeping Tabs on the Unique Jet in M87 During Cycle 15
15700091	ACTIVE GALAXIES AND QUASARS	Hardcastle	GO	140	Jet-driven outflows in radio galaxies
15700111	ACTIVE GALAXIES AND QUASARS	Massaro	GO	276	Continuing the Chandra 3CR Snapshot Survey: 23 Radio Sources with 0.5
15700182	ACTIVE GALAXIES AND QUASARS	Reines	GO	200	AGN-Triggered Star Formation in the Dwarf Galaxy Henize 2-10?
15700192	ACTIVE GALAXIES AND QUASARS	Siemiginowska	GO	85	Deep Chandra Imaging of Two Youngest Radio Sources
15700338	ACTIVE GALAXIES AND QUASARS	Satyapal	GO	152	PRE-SELECTING DUAL AGN CANDIDATES USING WISE: A CHANDRA PILOT STUDY
15700344	ACTIVE GALAXIES AND QUASARS	Piconcelli	GO	50	Chandra imaging of the bright Compton-thick Seyfert galaxy ESO 138-G1
15700355	ACTIVE GALAXIES AND QUASARS	Braito	GO	200	Probing the circumnuclear region of NGC 7582
15700378	ACTIVE GALAXIES AND QUASARS	Wilkes	GO	200	Probing dark matter in the luminous radio galaxy 3C220.3 and the structure of the z=2.22 SMG/AGN it is lensing.
15700397	ACTIVE GALAXIES AND QUASARS	Tombesi	LP	500	Unifying X-ray winds in radio galaxies with Chandra HETG
15700418	ACTIVE GALAXIES AND QUASARS	Worrall	GO	190	Testing relativistic feedback at crucial jet power
15700425	ACTIVE GALAXIES AND QUASARS	Kaufmann	TOO	30	Exploring the X-ray - TeV connection in BL Lacs on short timescales
15700482	ACTIVE GALAXIES AND QUASARS	Lohfink	GO	50	The mystery of NGC 1377 -- AGN feedback in a low mass galaxy?
15700485	ACTIVE GALAXIES AND QUASARS	Vignali	GO	140	Probing black hole accretion in binary quasars at high redshifts
15700502	ACTIVE GALAXIES AND QUASARS	Kraemer	GO	250	Resolved Spectroscopy of the Extended X-ray Emission in NGC 4151: New Insights into AGN-driven Outflows
15700509	ACTIVE GALAXIES AND QUASARS	Levan	GO	50	LATE TIME MONITORING OF THE EXCEPTIONAL TIDAL DISRUPTION EVENT SWIFT J1644+57
15700510	ACTIVE GALAXIES AND QUASARS	Fabbiano	GO	250	THE NUCLEAR FE- K SOURCES OF THE MERGER ULIRG ARP220
15700519	ACTIVE GALAXIES AND QUASARS	Ponti	TOO	280	X-ray monitoring of Sgr A* during outburst
15700542	ACTIVE GALAXIES AND QUASARS	Lal	GO	36	A Chandra Study of Nearby Hybrid Morphology Radio Source
15700554	ACTIVE GALAXIES AND QUASARS	Schirmer	GO	190	Studying AGN evolution with ionization echoes
15700595	ACTIVE GALAXIES AND QUASARS	Mathur	GO	100	The curious case of Mrk~590
15700675	ACTIVE GALAXIES AND QUASARS	Chartas	GO	100	The Ultrafast Outflow of the Lensed z=1.51 AGN HS 0810+2554
15700719	ACTIVE GALAXIES AND QUASARS	Comerford	GO	155	A Pilot Search for Spatially Offset AGN in Galaxy Merger Remnants
15800006	CLUSTERS OF GALAXIES	Sun	GO	48	RXJ1324.7-5736: one of the closest and brightest cool core clusters
15800201	CLUSTERS OF GALAXIES	Romani	GO	100	Imaging spectroscopy of the Remarkable Halo of 4C+37.11
15800314	CLUSTERS OF GALAXIES	Buote	GO	100	The Massive Fossil Cluster RXJ1416.4+2315
15800323	CLUSTERS OF GALAXIES	Gastaldello	GO	51	Probing with X-ray the mass distribution in the lensing cluster A1703
15800332	CLUSTERS OF GALAXIES	Pacaud	GO	205	SNAPSHOTS IN THE HISTORY OF DISSOCIATIVE MAJOR MERGERS
15800369	CLUSTERS OF GALAXIES	RUDNICK	GO	180	Abell 2256: New paradigms for thermal/relativistic interactions?
15800442	CLUSTERS OF GALAXIES	Hardcastle	GO	180	Powerful radio galaxies in rich clusters
15800474	CLUSTERS OF GALAXIES	Sanders	LP	500	Deep imaging and spectroscopy of the Centaurus cluster: metals and filaments
15800532	CLUSTERS OF GALAXIES	Lovisari	GO	40	TO THE VIRIAL RADIUS OF THE MOST LUMINOUS LOCAL GALAXY GROUP: UGC03957
15800543	CLUSTERS OF GALAXIES	McDonald	GO	59.1	Searching for Signatures of Episodic AGN Feedback in the Core of the Phoenix Cluster
15800582	CLUSTERS OF GALAXIES	Sarazin	GO	120	Did Precessing Jets and/or a Merger Make a Diamond in Abell 2626?
15800614	CLUSTERS OF GALAXIES	Donahue	GO	90	Unmasking Galaxy Clusters Masquerading As Quasars
15800657	CLUSTERS OF GALAXIES	Hughes	LP	498	Chandra Observations of a Complete Sample of SZE Clusters from ACT
15800664	CLUSTERS OF GALAXIES	Allen	GO	250	A deep study of ram-pressure stripping, metal ridges, and AGN feedback in the Ophiuchus Cluster
15800706	CLUSTERS OF GALAXIES	Kraft	LP	500	Hydrodynamics of merging and stripping in the Fornax Cluster: A Deep Chandra observation of NGC 1404
15800803	CLUSTERS OF GALAXIES	Mantz	GO	65	Setting the Scale: Supporting precision cluster cosmology with Chandra observations of low-z lensing clusters
15800858	CLUSTERS OF GALAXIES	Jones	LP	520	Clusters, Galaxies, and AGN in HST Frontier Fields
15900132	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Brandt	XVP	4000	The Chandra Deep Field-South: A Peerless Ultradeep Survey for Exploring the Distant X-ray Universe
15900142	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Townsley	XVP	2000	The Tarantula -- Revealed by X-rays (T-ReX): A Definitive Chandra Investigation of 30 Doradus
15900275	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Ajello	GO	15	The largest complete sample of Local AGN
15900454	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Daddi	GO	96	Hot gas emission and AGN-galaxy coevolution at the dawn of cluster formation
15900537	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Martini	GO	100	The growth of the most massive black holes and galaxies: A study of AGN in an overdensity at z=2.53.
15900685	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Levan	TOO	60	The demographics of dark gamma-ray burst hosts
15910352	GALACTIC DIFFUSE EMISSION AND SURVEYS	Mori	GO	24	Chandra Studies of Unidentified X-ray Sources in the Galactic Bulge
15910500	GALACTIC DIFFUSE EMISSION AND SURVEYS	Kobulnicky	GO	25	PROBING THE ENERGY THRESHOLD FOR TRIGGERED STAR FORMATION
15910506	GALACTIC DIFFUSE EMISSION AND SURVEYS	Wang	GO	60	An X-ray View of Hypervelocity Star HVS5
15910711	GALACTIC DIFFUSE EMISSION AND SURVEYS	Tomsick	TOO	20	Localizing NuSTAR-Discovered Sources in the Galactic Plane
15910826	GALACTIC DIFFUSE EMISSION AND SURVEYS	Soldi	GO	100	The Sgr C complex: a cosmic ray dominated region?

Subject Category: SOLAR SYSTEM

Proposal Number: 15100276

Title: Plasma in the Jovian magnetosphere: An X-ray and EUV study of the aurora and the Io plasma torus

Type: GO Total Time (ks): 160

PI Name: Ralph Kraft

We propose 4x40 ks Chandra/HRC-I and 2x40 ks XMM-Newton observations of the Jovian aurora and Io plasma torus in conjunction with the Japanese SPRINT-A satellite. SPRINT-A will continuously observe Jupiter from Dec 2013 to Apr 2014, making sensitive EUV spectroscopic observations of the aurora and IPT. We will correlate variations in the X-ray flux from the aurora and IPT with changes in the EUV flux observed by SPRINT-A and with the properties of the solar wind. We will conclusively resolve the puzzle of the origin of the Jovian X-ray emission and determine if the precipitating particles originate from Io or from the solar wind.

Target Name	Det.	Grating	Exp.Time (ks)
Jupiter	HRC-I	NONE	40
Jupiter	HRC-I	NONE	40
Jupiter	HRC-I	NONE	40
Jupiter	HRC-I	NONE	40

Subject Category: SOLAR SYSTEM

Proposal Number: 15100583

Title: Plumbing the Heights of the Solar Wind With Comet ISON

Type: GO Total Time (ks): 86

PI Name: Carey Lisse

Comet ISON offers us the first opportunity in the Chandra era to make a truly differential measurement using the same comet neutral gas source between the hot, dense, and slow solar equatorial wind and the mixed solar wind at mid-solar latitudes (produced in the transition region between the hot equatorial wind and the cold polar solar wind). This intensively active comet will be ensconced in the hot equatorial wind and viewable by Chandra until 08 Nov 2013, whence it comes too close to the Sun to be observed. ISON reappears, however, at even brighter apparent magnitude on 17 Dec 2013, at +25deg heliographic latitude, in the midst of the solar wind transition region, providing a rare combination of a well-studied bright comet detectable by Chandra at higher solar latitudes.

Target Name	Det.	Grating	Exp.Time (ks)
Comet C/2012 S1 (ISON)	HRC-I	NONE	9
Comet C/2012 S1 (ISON)	ACIS-S	NONE	40
Comet C/2012 S1 (ISON)	HRC-I	NONE	10
Comet C/2012 S1 (ISON)	ACIS-S	NONE	27

Subject Category: SOLAR SYSTEM

Proposal Number: 15100843

Title: Chandra Observations of Pluto's Escaping Atmosphere in Support of the New Horizons Mission

Type: GO Total Time (ks): 35

PI Name: Ralph McNutt

Current models of Pluto's extended N2+CH4 atmosphere are still very uncertain, causing numerous difficulties in optimizing the New Horizons fast flyby operations plan for the dwarf planet. Applying knowledge gained from studying cometary X-ray emission, Chandra ACIS-S photometric imaging of X-rays produced by CXE between the solar wind and Pluto's atmosphere will address both the run of atmospheric density and the interaction of the solar wind with the extended Plutonian atmosphere. Determining the atmosphere's extent and amount of free molecular escape will aid the atmospheric sounding measurements of the NH ALICE instrument, while determining the x-ray luminosity will help the NH PEPSI instrument characterize the solar wind particle environment.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
		Pluto	HRC-I	NONE	35

Subject Category: STARS AND WD

Proposal Number: 15200114

Title: CHANDRA X-RAY OBSERVATIONS OF THE ETA CAR ANALOG NAST1 (WR 122): IS IT A COLLIDING-WIND BINARY?

Type: GO Total Time (ks): 12

PI Name: Jon Mauerhan

We propose Chandra ACIS observations of NaSt1 (aka WR 122). NaSt1 is the only candidate analog to the famous colliding-wind X-ray binary Eta Carina. It is an evolved, luminous, hot star that, like Eta Car, is embedded in a dense CNO-processed outflow. We have already secured HST observations of NaSt1 to determine the precise morphology of its nebula. Now, we require high-resolution X-ray imaging observations with Chandra/ACIS to determine if, like Eta Car, NaSt1 is an X-ray source, and moreover, a colliding-wind binary. The combined HST and Chandra data will reveal whether NaSt1 is truly an Eta Car analog, or something entirely different.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
18:52:17.40	+00:59:44.00	WR 122	ACIS-I	NONE	12

Subject Category: STARS AND WD

Proposal Number: 15200163

Title: High-Resolution Observations of Procyon's Fe L-shell Soft X-ray Emission

Type: GO Total Time (ks): 95

PI Name: Peter Beiersdorfer

We propose a 95 ksec observation of Procyon with the HETGS, which will provide the first high-resolution stellar observation of the L-shell emission lines of the M-shell Fe ions, which have been observed before only as absorption features in AGN spectra, such as the HETGS observation of NGC 3783. The temperature-sensitive ratio of the intensity of the Fe lines observed with the HETGS will be compared to the Fe lines observed with LETGS near 100 A to reevaluate a puzzling discrepancy between theory and observation noted in the spectra of Capella. The observation will also provide a temperature of Procyon's corona using a novel dielectronic satellite method and show that future missions require not only a high effective area but also high spectral resolution to use this method.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
07:39:18.10	+05:13:30.00	Procyon	ACIS-S	HETG	95

Subject Category: STARS AND WD

Proposal Number: 15200243

Title: Rejuvenation of the Innocent Bystander: Testing Spin-Up in Dwarf Carbon Stars

Type: GO Total Time (ks): 104.6

PI Name: Paul Green

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 dCs 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 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)
10:15:48.90	+09:46:49.80	SDSS J101548.90+094649.7	ACIS-S	NONE	16.1

Subject Category: STARS AND WD

Proposal Number: 15200307

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

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

Subject Category: STARS AND WD

Proposal Number: 15200333

Title: The eye of the hurricane. Exploring the innermost wind region of the massive star QV Nor.

Type: GO Total Time (ks): 80

PI Name: Jose Torrejon

We propose to use the unique high resolution capabilities of Chandra gratings to study in depth the stellar wind structure and properties of QV Nor, the B0I supergiant companion of the wind accreting pulsar 4U1538-52. The goal is to put observational constrains on the current models of stellar winds in massive stars using the point like source of ionizing X-rays as a probe. In particular we want to: a) characterize the rich emission line spectrum suggested by XMM, obtaining the first high resolution spectrum ever for this source. b) study the ionized wind of QV Nor in the innermost region r< 1.5R* which, to date, remains largely unexplored, c) finally, study the interstellar medium and the poorly known distance towards QV Nor by analyzing the properties of the dust scattered halo.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
15:42:23.40	-52:23:09.60	QV Nor	ACIS-S	HETG	80

Subject Category: STARS AND WD

Proposal Number: 15200353

Title: X-rays from the most nearby brown dwarf, WISE1049-5319

Type: GO Total Time (ks): 50

PI Name: Beate Stelzer

The magnetic activity of ultracool dwarfs, beyond the M/L spectral type transition, is nearly unconstrained as a consequence of the sensitivity limits of present-day instrumentation. To date only one L dwarf, Kelu1, has been detected at X-rays. The very recent discovery of WISE1049-5319, a brown dwarf binary at only 2pc from the Sun and the third-closest neighbor of the Sun, presents the opportunity to perform the deepest possible X-ray observations for an ultracool dwarf. A 50ksec Chandra observation allows us to move even beyond the sensitivity limits achieved for the (X-ray) brighter M dwarfs. The X-ray detection of WISE1049-5319 would represent a major step in our knowledge of magnetic activity in the substellar regime. A strong constraint on the upper limit would also be important.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
10:49:15.50	-53:19:06.10	WISE1049-5319	ACIS-S	NONE	50

Subject Category: STARS AND WD

Proposal Number: 15200426

Title: Wind Properties in a Very Young Pup

Type: GO Total Time (ks): 135

PI Name: Norbert Schulz

We propose HETGS observations of the central young IR star IRS2 in RCW 38 for 135 ks in order to obtain a high precision X-ray spectrum of a young (< 1.0 Myr) massive Zero Age Main- Sequence (ZAMS) star of very early O-type. In a first snapshot observation during Cycle 10 we were able to successfully rule out a contribution from an unseen low-mass companion and as well as significant contributions of magnetic activity. In this second part we provide enough exposure to determine detailed line properties and test for the presence of a thick wind, directly compare these properties to its mature cousin Pup, and investigate dynamic properties.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
08:59:05.60	-47:30:40.90	RCW38/IRS2	ACIS-S	HETG	135

Subject Category: STARS AND WD

Proposal Number: 15200435

Title: X-ray irradiation of planets with atmospheres amenable to comprehensive follow-up

Type: GO Total Time (ks): 60

PI Name: Michael Salz

We propose to measure the X-ray emission in a sample of six exoplanetary systems harboring Jovian planets with atmospheres amenable to comprehensive follow-up studies. Intense stellar high-energy irradiation on planetary atmospheres is thought to cause atmospheric heating, expansion and mass loss. To put models of irradiated atmospheres to a test, measurements of the X-ray and EUV emission are required for a large sample of planets. We identified planets with atmospheres that have the potential to be studied using time-resolved transit spectroscopy at UV and optical wavelengths. The proposed X-ray measurements will allow us to characterize the activity of the host stars, derive an estimate for the planetary mass-loss rate, and identify the most promising targets for follow-up studies.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
16:20:36.30	+41:02:53.10	HAT-P-2	ACIS-S	NONE	10
16:15:50.40	+10:01:57.30	Wasp-38	ACIS-S	NONE	10
02:28:37.20	-07:03:38.40	Wasp-77	ACIS-S	NONE	10
23:15:58.30	+31:27:46.30	Wasp-10	ACIS-S	NONE	10
23:59:36.10	-35:01:52.90	Wasp-8	ACIS-S	NONE	10
07:27:39.90	+24:20:11.40	Hat-P-20	ACIS-S	NONE	10

Subject Category: STARS AND WD

Proposal Number: 15200448

Title: Can X-rays clear a circumstellar disk in 2 years?

Type: GO Total Time (ks): 10

PI Name: Hans Guenther

Young stars are born surrounded by primordial disks. Eventually, these proto-planetary disks vanish. Some systems later form a debris disk with small dust grains. Up until May 2008 our target TYC 8241 2652 1 showed strong IR emission from such a disk. Between 2008 and 2010 the IR emission dropped by two orders of magnitude, which means that the dust mass in the inner disk decreased by 90-99%. The cause is unknown, but several hypotheses require high X-ray activity. We propose to observe this target for 10 ks with ACIS-S. This pointing will verify the association of a close-by ROSAT and XMM-Newton slew survey source with TYC 8241 2652 1, confirm the X-ray flux and look for signatures of high X-ray activity such as high plasma temperatures and Ne/Fe abundance ratios.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
12:09:02.20	-51:20:40.80	TYC 8241 2652 1	ACIS-S	NONE	10

Subject Category: STARS AND WD

Proposal Number: 15200476

Title: INVESTIGATING BINARITY AND ACTIVE ACCRETION IN A NEW CLASS OF AGB STARS WITH FUV EXCESSES

Type: GO Total Time (ks): 70

PI Name: Raghvendra Sahai

We propose a pilot survey for X-ray emission from AGB stars that are candidates for having binary companions with active accretion. These objects were identified via our innovative technique to search for FUV/NUV excesses in AGB stars using GALEX. The detection (or non-detection) of X-rays from this sample will enable us to begin testing models for the origin of the UV-excesses, leading to vital breakthroughs in our understanding of accretion-related phenomena and binarity in AGB stars. A larger survey, optimised using results fron this study, will be proposed in future cycles.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
07:41:08.50	+20:25:44.30	Y Gem	ACIS-S	NONE	10
02:11:48.90	-71:29:02.60	CI Hyi	ACIS-S	NONE	10
10:51:37.30	-21:15:00.30	V Hya	ACIS-S	NONE	10
08:46:21.20	+01:37:56.00	EY Hya	ACIS-S	NONE	10

Subject Category: STARS AND WD

Proposal Number: 15200512

Title: Do exoplanets spin up their host stars?

Type: GO Total Time (ks): 141

PI Name: Katja Poppenhaeger

We have collected initial evidence that tidal interaction between a late-type star and its close-in, massive planet can lead to a spin-up of the host star. We propose to explore this further by studying a small sample of proper motion pairs in which one of the stars is orbited by a Hot Jupiter. We will determine if the activity-estimated age appears to be strongly different for the two stars, which would indicate a tidal spin up of the Hot Jupiter host star. We propose to observe 4 such systems with Chandra/ACIS-S, and to perform a similar observation of one additional system with large angular separation using XMM-Newton/EPIC. The total proposed exposure times are 141 ks (Chandra) and 38 ks (XMM).

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
05:59:49.60	-48:14:22.00	HD 41004	ACIS-S	NONE	46
06:33:12.70	+05:27:45.30	HD 46375	ACIS-S	NONE	10
12:37:16.40	-40:48:43.60	HD 109749	ACIS-S	NONE	28
19:37:11.70	+28:29:59.50	HD 185269	ACIS-S	NONE	57

Subject Category: STARS AND WD

Proposal Number: 15200514

Title: Coronal and Shock Emission in the Accreting T Tauri Star RY Tau

Type: GO Total Time (ks): 120

PI Name: Stephen SKINNER

We have detected the accreting jet-driving T Tauri star RY Tau as a bright X-ray source with ACIS-S. Its spectrum shows numerous emission lines including O VII and Ne IX that likely originate in an accretion shock or the shocked jet, as well as lines such as Ca XIX and Fe K that form in very hot coronal plasma. Fluorescent iron emission (6.4 keV) from cold nearby material has also been seen. We propose here to obtain a HETG grating spectrum of RY Tau. Numerous emission lines will be detected and used to determine physical conditions in the hot plasma. The HETG spectrum along with an XMM RGS spectrum that is more sensitive to cool plasma will allow us to distinguish between coronal and shock emission and develop a complete picture of the origin of the X-ray emission.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
04:21:57.40	+28:26:35.50	RYTau	ACIS-S	HETG	120

Subject Category: STARS AND WD

Proposal Number: 15200523

Title: Investigating Star-Formation in the Filaments and Bubble of IC 5146

Type: GO Total Time (ks): 40

PI Name: Michael Kuhn

High-resolution X-ray observations of star-forming regions provide information about the populations and spatial distributions of young stars inaccessible from optical and infrared data, in particular the disk-free members. We propose a 40-ks observation of the young stellar cluster ionizing the IC 5146 HII region. The cluster lies in a structurally simple, nearby bubble powered by a B-type star located at the end of a 30-pc long molecular filament. With a clean sample of young stars obtained from the X-ray/IR/optical analysis, we will investigate clustering and spatial gradients in stellar ages and disk fractions to learn about the region's morphology and history. In addition, we will investigate disk evolution and star-formation efficiency in this environment.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
21:53:30.30	+47:16:03.60	IC 5146	ACIS-I	NONE	40

Subject Category: STARS AND WD

Proposal Number: 15200539

Title: Measuring the X-ray Emission Impacting the Planets Orbiting Nearby Low-mass Stars

Type: GO Total Time (ks): 140

PI Name: Alexander Brown

M dwarf planetary systems present a truly exciting opportunity to discover and study the first habitable extrasolar planets in the next 5-10 years. As part of our larger HST MUSCLES project, we propose ACIS-S observations of 4 low-mass exoplanet hosts (3 M dwarfs -- GJ581, GJ1214, GJ849, and 1 K dwarf -- HD97658) that have no existing measurements of their coronal X-ray emission. We will measure their X-ray luminosities and coronal temperatures, and derive the high energy radiation field to facilitate exoplanet atmospheric modeling. These planetary systems allow study of exoplanet atmospheric chemistry and evolution under a wide diversity of physical situations. X-ray heating enhances evaporation and atmospheric escape, which can impact the long-term stability of exoplanetary atmospheres.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
15:19:27.50	-07:43:19.40	GJ581	ACIS-S	NONE	50
17:15:18.90	+04:57:49.70	GJ1214	ACIS-S	NONE	30

Subject Category: STARS AND WD

Proposal Number: 15200550

Title: X-ray Emission from a Radio-Loud Hyperactive L Dwarf

Type: GO Total Time (ks): 25

PI Name: Carl Melis

The origin of radio emission in low-temperature stars and brown dwarfs remains a mystery, given the weak or absent optical and X-ray emission common to these sources. We have now identified the mid-type L dwarf 2MASS1315-2649 as the first low-temperature dwarf that is both a persistent and prodigious H-alpha emitter and a quiescent radio emitter. Given its unique level of magnetic activity, and as one of only four L dwarfs known to exhibit radio emission, we propose 25 ks of Chandra observations to probe the nature of this object's emission mechanisms. The proposed Chandra measurements will enable localization of the source emitting region and the possibility of distinguishing between a variety of competing models for magnetic emission processes in the substellar regime.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
13:15:30.90	-26:49:51.30	2MASS 1315-2649	ACIS-S	NONE	25

Subject Category: STARS AND WD

Proposal Number: 15200565

Title: Accretion-Driven Physics on the Young Star BP Tauri

Type: LP Total Time (ks): 600

PI Name: Nancy Brickhouse

We propose 600 ks with LETG/ACIS-S on the accreting young star BP Tau to study its X-ray emission physics. Our Chandra Large Program on TW Hya has resulted in definitive evidence for accretion, a puzzle over the soft X-ray emission producing O VII emission, and correlations between X-ray and optical signatures related to accretion. Spectral diagnostics from He-like Ne IX constrain all the properties of a simple accretion model, which incorporates the geometrical constraints provided by line-based absorption diagnostics. This deep Chandra spectrum is needed to determine the impact of accretion on a more typical accreting system with different orientation. We will also conduct a campaign to obtain optical photometry, spectroscopy, and spectropolarimetry (for magnetic topology maps).

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
04:19:15.80	+29:06:26.90	BP Tau	ACIS-S	LETG	600

Subject Category: STARS AND WD

Proposal Number: 15200579

Title: A Snapshot Survey of the Most Active Hot Jupiter Systems.

Type: GO Total Time (ks): 30

PI Name: Scott Wolk

X-ray observations of Jupiter mass planets close to their parent stars hold the key to several insights into exoplanets and the star-exoplanet systems. Magnetic and tidal activity are enhanced due to interactions between the star and the planet, there is enhanced high energy deposition into the upper atmosphere of the planet by the star and direct study of the planetary upper atmosphere is possible. Vital experiments have been performed using just two X-ray bright transiting systems. Although the results have been positive and tantalizing, they also stand as singular results. We request a snapshot survey of three transiting hot Jupiter systems which have indications of strong activity and are the best candidates to be bright enough in X-rays for further detailed studies.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
23:18:29.50	+24:53:21.40	WASP 59	ACIS-S	NONE	10
23:13:58.80	+08:45:40.60	WASP 52	ACIS-S	NONE	10
09:53:40.10	-45:39:33.00	WASP 19	ACIS-S	NONE	10

Subject Category: STARS AND WD

Proposal Number: 15200608

Title: Testing the wind-shock paradigm for B-type star X-ray production with theta Carinae (B0.2V)

Type: GO Total Time (ks): 125

PI Name: Veronique Petit

We propose a 125 ks observation of the B0.2V star theta Car, leveraging the unrivaled spectral resolution and sensitivity of the HETG to characterize the kinematics and energetics of the embedded wind shocks. This key star is at the transition between the efficient radiative cooling regime of O supergiants and the low-density, adiabatic regime of the early-B dwarfs. We will use the width the emission lines and the Mg XI f/i ratio to study its shock structure, and test whether an extension of the classical line-driving instabilities operating in O-star to a lower density regime can reproduce the observed X-ray properties of early B-stars. These observations will be essential to improve our classification of the many available broad-band X-ray spectra of B-stars from large cluster studies.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
10:42:57.40	-64:23:40.00	HD 93030	ACIS-S	HETG	125

Subject Category: STARS AND WD

Proposal Number: 15200662

Title: Probing the wind/radiative interactions with the circumstellar material at Periastron Passage of Eta Carinae

Type: GO Total Time (ks): 160

PI Name: Kenji Hamaguchi

The 2009 campaign observations of Eta Carinae revealed multiple plasma components produced by wind-wind collision (WWC) in different stages. X-rays from these plasmas showed emission lines that are not seen in collisionally ionized gas, such as an apparent broadening of the iron K line and unusually strong K-shell emission lines of various ions. These features are important in understanding wind-wind colliding physics, but the snap shot observations in 2009 do not have enough signal-to-noise to investigate them. We therefore propose 3 Chandra observations with deep exposures at critical phases associated with periastron in 2014.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
10:45:03.60	-59:41:04.20	Eta Carinae	ACIS-S	NONE	70
10:45:03.60	-59:41:04.20	Eta Carinae	ACIS-S	NONE	30
10:45:03.60	-59:41:04.20	Eta Carinae	ACIS-S	NONE	60

Subject Category: STARS AND WD

Proposal Number: 15200684

Title: X-Raying the Scorpion's Heart

Type: GO Total Time (ks): 25

PI Name: Vinay Kashyap

We propose to observe the Antares binary system with the HRC-I for 25 ks. This system has an M supergiant primary and a well-separated B2.5V secondary. We will easily detect the shock-front where the winds from the two stars collide. We will also likely detect the shocked wind X-ray emission from the B star. With this observation, we will place unique new constraints on the wind speed and mass loss for both stars. In addition, this will be one of the most sensitive observations of a nearby, resolved, M supergiant system. It is low-risk and low-cost, and has the potential to make a tremendous discovery: the detection of X-ray emission on an M supergiant.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
16:29:24.50	-26:25:55.20	Antares	HRC-I	NONE	25

Subject Category: WD BINARIES AND CV

Proposal Number: 15300309

Title: Determining the Nature of an 18-minute UV source in NGC 1851

Type: GO Total Time (ks): 50

PI Name: David Pooley

We have recently discovered an 18-minute UV source in the globular cluster (GC) NGC 1851. The system is either a symbiotic binary (a cool evolved star and a white dwarf with an 18 min spin period) or a chance superposition of a red giant and a white-dwarf binary system. In the latter case, the 18 minute period would be either the spin period of a magnetic white dwarf in an intermediate polar cataclysmic variable or the orbital period of a double-degenerate AM CVn binary. A measurement of the X-ray luminosity would discriminate between these two scenarios. A previous Chandra observation yielded an ambiguous detection so we propose here for a deeper observation which will conclusively answers this question.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
05:14:06.70	-40:02:48.10	NGC 1851	ACIS-S	NONE	50

Subject Category: WD BINARIES AND CV

Proposal Number: 15300487

Title: Probing Shocks of the Young Planetary Nebula NGC 7027

Type: GO Total Time (ks): 60

PI Name: Rodolfo Montez

The rapid evolution of the planetary nebula NGC 7027 provides a rare glimpse at the evolution of the shocks. We propose a detailed spatial and spectroscopic study of the shock conditions in NGC 7027 that will enhance and bridge our understanding of the shocks seen in other planetary nebula. Comparison between the Cycle 1 observation and a new Cycle 15 observation will (i) confirm the presence of the two components in the extended X-ray emission, (ii) measure the changes (spatial and spectral) in the components, and, (iii) provide a valuable trove of tests and inputs for shock conditions and hydrodynamical simulations. We rely on the unprecedented spatial resolution and soft-sensitivity of Chandra.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
21:07:01.60	+42:14:10.20	NGC 7027	ACIS-S	NONE	60

Subject Category: WD BINARIES AND CV

Proposal Number: 15300552

Title: A Fermi/LAT Trigger of Grating Observations of One Bright Nova in Outburst

Type: TOO Total Time (ks): 85

PI Name: Sumner Starrfield

A new and perplexing result in 2012 was the discovery by the Fermi/LAT that two Classical Novae (Mon 2012 and Sco 2012) were emitting gamma-rays at E > 100 MeV. The cause of this VHE emission is currently not understood but X-ray grating observations early in the outburst should shed light on the cause. We propose to obtain 2 grating spectra with Chandra of one bright CN in outburst. Our target will be determined based on a detection by the Fermi/Large Area Telescope (LAT), a confirmation by ground-based spectroscopy that it is a CN, and a Swift/XRT determination that it is sufficiently bright for an HETG+ACIS-S grating observation. A second spectrum will be obtained with the LETG+HRC-S when the nova has transitioned into the Super Soft Source phase.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
		Nova ToO	ACIS-S	HETG	40
		Nova ToO	HRC-S	LETG	45

Subject Category: WD BINARIES AND CV

Proposal Number: 15300607

Title: Spatial Diagnostics of Potential X-ray Remnants in Old Novae T Aur and DK Lac

Type: GO Total Time (ks): 8

PI Name: Dai Takei

We propose 5 and 3 ks ACIS-S snapshots of potentially extended X-ray remnants of two old classical novae, T Aur and DK Lac. They are the likely counterparts of X-ray sources discovered in our Swift survey of old classical novae, and each target has a spatially-resolved optical remnant with a size of order arcseconds. The additional short Chandra snapshots will confirm or reject the tentative Swift identifications through pinpoint astrometry, and will distinguish between extended remnant emission or rejuvenated accretion. Both are important for understanding binary evolution and also potential post-outburst hibernation, while detection of extended emission will represent extremely rare additions to the exclusive club of X-ray emitting classical nova remnants.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
05:31:59.10	+30:26:45.00	T Aur	ACIS-S	NONE	5
22:49:46.90	+53:17:19.30	DK Lac	ACIS-S	NONE	3

Subject Category: WD BINARIES AND CV

Proposal Number: 15300811

Title: X-ray Diagnostics of Evolving Nova Remnant in GK Per

Type: GO Total Time (ks): 100

PI Name: Dai Takei

We propose a 100 ks ACIS-S observation of the old classical nova GK Per, which has a unique spatially well-resolved X-ray remnant. A Chandra observation 14 years ago discovered thermal and non-thermal signatures, similar to those found in supernova remnants. The goal of this program is to obtain second-epoch Chandra imaging spectroscopy to measure the X-ray proper motion of the expanding nebula and assess the ejecta velocity, mass, and energetics. In addition, comparison of the intensities of the non-thermal X-ray hot spots will probe the magnetic field strength and particle acceleration potential of this classical nova remnant. GK Per is the only nova remnant for which this study can be made, and the success of this program will provide an important clue to classical novae.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
03:31:11.80	+43:54:16.80	GK Per	ACIS-S	NONE	100

Subject Category: WD BINARIES AND CV

Proposal Number: 15300872

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

Type: TOO Total Time (ks): 100

PI Name: Thomas Nelson

We request a Chandra target of opportunity observation of the next 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, to study the mass ejection process in novae. We will utilize detailed modeling of absorption of the central source by shells of hot, photoionized gas to characterize the nova ejecta in X-rays, and then compare this to the mass ejection implied by radio light curves. The two regimes in tandem will enable us to estimate the mass ejected during outburst.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
		A bright nova	HRC-S	LETG	100

Subject Category: BH AND NS BINARIES

Proposal Number: 15400074

Title: INVESTIGATING NEW INTEGRAL SOURCES WITH Chandra

Type: TOO Total Time (ks): 40

PI Name: Adamantia Paizis

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
		New INTEGRAL source 2	ACIS-S	HETG	20

Subject Category: BH AND NS BINARIES

Proposal Number: 15400089

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

Type: TOO Total Time (ks): 24

PI Name: Katja Pottschmidt

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

Subject Category: BH AND NS BINARIES

Proposal Number: 15400135

Title: A DEEP SUBARRAY EXPOSURE OF X7 IN 47 TUC: TOWARDS CONSTRAINING NEUTRON STAR STRUCTURE

Type: GO Total Time (ks): 200

PI Name: Slavko Bogdanov

X-ray spectroscopic observations of thermally-emitting quiescent low-mass X-ray binaries (qLMXBs) have been used to constrain the neutron star (NS) equation of state (EoS). The qLMXB X7 in 47 Tuc is the best target for constraints of the NSs EoS, due to its known distance, high countrate, and simple single-temperature hydrogen atmosphere spectrum. In our previous 270-ks full-frame ACIS-S observation, X7 suffered from significant pile-up (~15%), degrading the spectrum and introducing large statistical and systematic uncertainties in the measurement. We propose a 200-ks 1/8 subarray ACIS-S exposure in order to minimize the deleterious effects of pile-up, thereby dramatically improving the constraints on the structure of this NS and yielding the best such measurement for any qLMXB.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
00:24:05.40	-72:04:53.20	47 Tuc	ACIS-S	NONE	200

Subject Category: BH AND NS BINARIES

Proposal Number: 15400162

Title: Chandra Spectroscopy of a Remarkable Neutron Star

Type: GO Total Time (ks): 100

PI Name: Jon Miller

IGR J17062-6143 is one of only 5 sources that have displayed a super-expansion burst. This requires a special mode of continuous low-level accretion that allows material to accumulate on the stellar surface, without triggering smaller bursts. Swift spectroscopy of a super-expansion burst in IGR J17062-6143 revealed the only strong detections of atomic emission and absorption lines in a burst observed at CCD or gratings resolution. Whereas atomic features from the stellar surface have not been detected in other neutron stars, the accretion mode in IGR J17062-6143 may provide the right conditions. To search for lines from the surface, and to better understand the nature of low-level accretion, we request a 100 ksec HETGS observation of IGR J17062-6143.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
17:06:13.80	-61:43:44.70	IGR J17062-6143	ACIS-S	HETG	100

Subject Category: BH AND NS BINARIES

Proposal Number: 15400216

Title: Observing a cooling neutron star crust in Terzan 5

Type: GO Total Time (ks): 105

PI Name: Nathalie Degenaar

We propose a 105 ks Chandra observation of the globular cluster Terzan 5, to continue our study of the thermal evolution of the transiently accreting neutron star IGR J17480-2446. Previous Chandra observations have revealed that the crust of the neutron star was severely heated during a 10-week long accretion outburst in 2010, and is currently cooling in quiescence. Monitoring this crustal cooling yields valuable information about the heat generation and thermal transport properties of the neutron star crust. Following the first instance where crust cooling has been observed after a short accretion outburst poses a breakthrough opportunity in neutron star research.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
17:48:05.20	-24:46:47.30	Terzan 5	ACIS-S	NONE	105

Subject Category: BH AND NS BINARIES

Proposal Number: 15400240

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

Type: TOO Total Time (ks): 4

PI Name: Deepto Chakrabarty

We propose to observe up to four neutron star or black hole X-ray 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

Target Name	Det.	Grating	Exp.Time (ks)
X-ray transient 1	ACIS-S	NONE	1
X-ray transient 2	ACIS-S	NONE	1
X-ray transient 3	ACIS-S	NONE	1
X-ray transient 4	ACIS-S	NONE	1

Subject Category: BH AND NS BINARIES

Proposal Number: 15400249

Title: A study of the relativistic jet of 4U 1630-47

Type: TOO Total Time (ks): 100

PI Name: Maria Diaz Trigo

We propose one 100~ks observation of the black hole (BH) low mass X-ray binary (LMXB) 4U 1630-47 in a very high state of accretion. We will investigate the presence of the narrow emission features observed in a recent XMM spectrum of the source that we interpret 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. With simultaneous radio observations we will test models for jet expansion and ejections in transitional states.

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

Subject Category: BH AND NS BINARIES

Proposal Number: 15400260

Title: Searching for a Metallicity Effect in Field X-ray Binaries

Type: GO Total Time (ks): 150

PI Name: Thomas Maccarone

Recent work has shown a strong color gradient in the halo of NGC 4472, indicating a metallicity which falls off sharply outside a few effective radii. The surface brightness of this region of NGC 4472, while small, is large enough to provide a large sample of stars at low metallicity. This sample can be used to test whether the metallicity effect seen in globular clusters, that metal rich clusters are about 3 times more likely than metal poor clusters to host X-ray binaries, is present in field star populations as well. This can then be used to help distinguish between models where the metallicity effect is due primarily to stellar evolution versus those where it is due primarily or partially to dynamical effects.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
12:29:04.40	+07:49:24.10	NGC 4472 Halo-1	ACIS-I	NONE	30
12:28:45.00	+08:03:48.00	NGC 4472 Halo-2	ACIS-I	NONE	30
12:29:43.20	+08:15:12.30	NGC 4472 Halo-3	ACIS-I	NONE	30
12:30:43.80	+08:05:21.60	NGC 4472 Halo-4	ACIS-I	NONE	30
12:30:14.20	+07:50:00.20	NGC 4472 Halo-5	ACIS-I	NONE	30

Subject Category: BH AND NS BINARIES

Proposal Number: 15400298

Title: A Black Hole in the Galactic Globular Cluster M62

Type: GO Total Time (ks): 87

PI Name: Laura Chomiuk

Following our discovery of the first strong candidate black holes in a Milky Way globular cluster, we pursued additional clusters with the Karl G. Jansky Very Large Array (VLA). We have now discovered a candidate stellar-mass black hole in a second Milky Way globular cluster: M62. This candidate is unique in that, unlike the earlier-discovered sources in M22, it has an associated Chandra X-ray source. We request 87 ksec of Chandra imaging, along with joint VLA observations, to measure simultaneous X-ray and radio luminosities and assess the nature of this candidate. Confirmation of a black hole in M62 constitutes a critical step in establishing a population of black holes in globular clusters and developing a new technique for discovering Galactic black holes.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
17:01:12.80	-30:06:49.40	M62	ACIS-S	NONE	87

Subject Category: BH AND NS BINARIES

Proposal Number: 15400302

Title: Transient LMXBs in Globular Clusters

Type: TOO Total Time (ks): 45

PI Name: David Pooley

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.

Target Name	Det.	Grating	Exp.Time (ks)
GC Transient 1	ACIS-S	NONE	15
GC Transient 2	ACIS-S	NONE	15
GC Transient 3	ACIS-S	NONE	15

Subject Category: BH AND NS BINARIES

Proposal Number: 15400308

Title: LETGS Spectroscopy of the Ultracompact Binary 4U 1626-67

Type: GO Total Time (ks): 130

PI Name: Deepto Chakrabarty

A strong Ne/O emission line complex near 1 keV gives this object one of the most unusual known LMXB X-ray spectra. The X-ray source recently entered a prolonged, multi-year bright state. We propose to obtain the first LETGS spectrum of this rich line source, in order to search for the predicted X-ray lines of C near 0.3 keV and measure the known lines of Ne and O. We will use these lines to constrain the exotic composition of the WD donor and to explore the ionization and velocity structure of the accretion disk as a function of radius and compare to theoretical predictions.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
16:32:16.70	-67:27:42.00	4U 1626-67	HRC-S	LETG	130

Subject Category: BH AND NS BINARIES

Proposal Number: 15400315

Title: ToO observation of a bright Galactic transient discovered by Fermi and Swift

Type: TOO Total Time (ks): 30

PI Name: Isabelle GRENIER

We propose a TOO observation of one bright Galactic transient detected by the Fermi large area telescope, and followed by a Swift-XRT detection. Our goal is to determine the nature of an event similar to the intense, non-blazar, transient that EGRET has detected near the Galactic plane once in its lifetime. The lack of a radio-loud blazar counterpart and of a spacially coincident X-ray binary indicates either a new manifestation of a non-blazar active galaxy lying behind the Milky Way, capable of producing massive gamma-ray flares, or a new facet of Galactic compact objects. A significant XRT detection of an X-ray counterpart will trigger the proposed 30 ks Chandra observation to locate precisely this counterpart, to constrain the X-ray decay time, and to measure the source spectrum.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
		Fermi Transient	ACIS-S	NONE	30

Subject Category: BH AND NS BINARIES

Proposal Number: 15400317

Title: X-Ray Jets in Microquasars

Type: TOO Total Time (ks): 150

PI Name: Stephane Corbel

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

Subject Category: BH AND NS BINARIES

Proposal Number: 15400330

Title: Does Holmberg II X-1 harbor an intermediate-mass black hole?

Type: GO Total Time (ks): 13

PI Name: Peter Jonker

The nature of ULXs remains unclear. The emission of some of these ULXs is shown to be isotropic (not strongly beamed), meaning that either they accrete above the Eddington limit or they harbor intermediate-mass BHs. In the latter case, they are probably accreting in the ULX equivalent of the low-hard state and as such they should fall on the Fundamental Plane of BH activity. We propose to test using a simultaneous Chandra and VLA-A configuration observation if Holmberg II X-1 falls on this Fundamental Plane. If so, it would establish the ULX as a strong IMBH candidate.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
08:19:29.00	+70:42:19.30	Holmberg II X-1	ACIS-S	NONE	13

Subject Category: BH AND NS BINARIES

Proposal Number: 15400346

Title: X-ray pulsars at very low mass accretion rates

Type: TOO Total Time (ks): 450

PI Name: Pablo Reig

Accretion-powered pulsars are predicted to enter a centrifugally inhibited state at low mass accretion rates due to the propeller effect. In this state, accretion is halted. However, three Be/X-ray binaries show pulsations at low luminosities (< 10^{34} erg s^{-1}). At least in one occasion X-ray pulse emission was detected when the reservoir of matter that fuels the X-rays was exhausted. We propose to observe a maximum of two accreting pulsars as ToO (50 ksec each) when mass transfer from the donor has presumably stopped i order to characterise this low-luminosity state and to distinguish between alternative models to accretion.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
01:18:31.90	+63:44:24.00	4U 0115+63	ACIS-S	NONE	50
03:34:59.90	+53:10:23.30	V0332+53	ACIS-S	NONE	50
04:40:59.30	+44:31:49.30	RX J0440.9+4431	ACIS-S	NONE	50
06:58:17.30	-07:12:35.20	XTE J0658-073	ACIS-S	NONE	50
19:45:39.40	+27:21:55.50	XTE J1946+274	ACIS-S	NONE	50
19:49:35.50	+30:12:31.80	KS 1947+300	ACIS-S	NONE	50
20:32:15.30	+37:38:14.90	EXO 2030+375	ACIS-S	NONE	50
20:58:47.50	+41:46:37.30	GRO J2058+42	ACIS-S	NONE	50
21:03:35.70	+45:45:05.50	SAX J2103.5+4545	ACIS-S	NONE	50

Subject Category: BH AND NS BINARIES

Proposal Number: 15400408

Title: SS 433 Jet Formation

Type: GO Total Time (ks): 150

PI Name: Herman Marshall

Our goal is to determine how the SS 433 jets are reoriented. In a 75 ks HETGS data set, we found a Doppler shift change on a time scale of 20 ks, much smaller than the known dynamical times. The shift may have triggered the ejection of a radio-emitting knot. If the rapid changes result from interaction with an accretion disk wind, then we predict that all Doppler shift changes are abrupt, that the jets will shift independently, and that the Doppler shifts would only follow the known periods in a general way. We will test this model with 150 ks of HETGS data and joint VLBA data, so two knot ejections are expected in both jets. This test can only be done with high resolution X-ray spectra because the X-ray emission originates at the base of the jet, unlike the optical and radio emission.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
19:11:49.50	+04:58:58.00	SS 433	ACIS-S	HETG	150

Subject Category: BH AND NS BINARIES

Proposal Number: 15400412

Title: A Definitive Test of Relativistic Disk Lines in Neutron Stars

Type: LP Total Time (ks): 300

PI Name: Edward Cackett

Accretion disks around neutron stars must be truncated at the stellar surface. If neutron star spectra contain relativistic lines from the inner disk, these lines could then give constraints on stellar radii and the neutron star equation of state. Such lines have recently been claimed in many sources. However, other work has brought the nature of these lines into question, largely owing to instrumental effects such as photon pile-up. The resolution of the HETG is ideally suited to testing the nature of such lines, and it is uniquely resistant to photon pile-up when the ACIS array is run in 'CC' mode. As a unified group of six teams, we request a 300 ksec observation of Serpens X-1 to definitively resolve the nature of iron lines in neutron star low-mass X-ray binaries.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
18:39:57.60	+05:02:09.60	Serpens X-1	ACIS-S	HETG	300

Subject Category: BH AND NS BINARIES

Proposal Number: 15400459

Title: A mutiwavelength probe of black hole accretion flows in quiescence

Type: GO Total Time (ks): 26

PI Name: Richard Plotkin

We request coordinated Chandra and Jansky VLA observations of the black hole X-ray binary Swift J1357.2-0933 in quiescence. At a distance of 1.6 kpc, this is the only remaining system, out of three total, with a confirmed black hole for which we can realistically hope to secure simultaneous X-ray and radio detections at highly sub-Eddington accretion rates, thereby probing empirical radio/X-ray correlations for hard state sources to the lowest observable luminosities. Swift J1357.2-0933 is also the only one of these three systems known to once be `radio-underluminous' at higher Eddington ratios. These observations will allow us to place new constraints on accretion flows and their outflows deep in quiescence, and to break some degeneracies between different accretion models.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
13:57:16.90	-09:32:38.90	Swift J1357.2-0933	ACIS-S	NONE	26

Subject Category: BH AND NS BINARIES

Proposal Number: 15400471

Title: CXOU J122518.6+144545: Type IIn supernova or hyperluminous X-ray source?

Type: GO Total Time (ks): 60

PI Name: Marianne Heida

In 2010 we reported the discovery of CXOU J122518.6+144545. A new Chandra observation in 2012 showed that it varies by more than a factor 10 in X-ray flux. This leaves us with two options: we either discovered a rare type IIn SN, or the second most luminous HLX thus far. Deeper Chandra observations combined with a new HST visit will decide between these scenarios. If CXO J1225 was a supernova, with these new data we will be able to identify the progenitor star. This will be only the second type IIn SN for which this is done. If instead the source is an HLX it is a strong candidate to contain an intermediate mass black hole. In this case the new Chandra data will give us information about its variability and the HST image will give us stronger constraints on the size of the optical source.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
12:25:18.60	+14:45:45.70	CXOU J122518.6+144545	ACIS-S	NONE	60

Subject Category: BH AND NS BINARIES

Proposal Number: 15400475

Title: Chandra's study of the slow pulsar SXP1062 associated with a young SNR in the SMC

Type: TOO Total Time (ks): 120

PI Name: Lidia Oskinova

SXP1062 is an exceptional case of a young neutron star with known age in a BeXRB. A unique combination of measured spin period, its derivative, luminosity and young age makes this source a key probe for the physics of accretion and neutron star evolution. All current accretion scenarios encounter major difficulties explaining the properties of this accretion-powered pulsar. This joint Swift and Chandra study will allow us to construct a spin period-luminosity relation as a powerful tool for distinguishing between different accretion and evolution models and thus shed new light on the physics of accreting neutron stars.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
01:27:45.90	-73:32:56.30	SXP 1062	ACIS-I	NONE	120

Subject Category: BH AND NS BINARIES

Proposal Number: 15400517

Title: The Nature of INTEGRAL Sources in the Galactic Plane

Type: GO Total Time (ks): 50

PI Name: John Tomsick

The INTEGRAL satellite is continuing to discover new hard X-ray sources in the Galactic plane. The few arcminute INTEGRAL positions do not allow for identification of these IGR sources at other wavelengths, leaving their nature unclear. Chandra can make a major contribution to studies of IGR sources by localizing the sources to allow for the identification of counterparts and by constraining the soft X-ray spectrum. We propose for relatively short Chandra observations of ten unidentified IGR sources in the Galactic plane. In previous cycles, this program has identified new High-Mass X-ray Binaries with interesting properties, Catalysmic Variables, Supernova Remnants, and Pulsar Wind Nebulae.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
17:16:29.50	-38:02:24.00	IGR J17164-3803	ACIS-I	NONE	5
14:09:05.80	-61:08:31.20	IGR J14091-6108	ACIS-I	NONE	5
15:33:29.50	-54:21:28.80	IGR J15335-5420	ACIS-I	NONE	5
18:38:09.10	-09:24:54.00	IGR J18381-0924	ACIS-I	NONE	5
08:29:48.00	-42:50:52.80	IGR J08297-4250	ACIS-I	NONE	5
18:09:01.00	-27:42:14.40	IGR J18088-2741	ACIS-I	NONE	5
20:10:34.30	+45:34:04.80	IGR J20107+4534	ACIS-I	NONE	5
17:17:20.40	-24:36:21.60	IGR J17174-2436	ACIS-I	NONE	5
04:05:59.80	+54:16:33.60	IGR J04059+5416	ACIS-I	NONE	5
17:30:24.20	-20:16:19.20	IGR J17306-2015	ACIS-I	NONE	5

Subject Category: BH AND NS BINARIES

Proposal Number: 15400524

Title: Search for absorption edges in superexpansion bursts

Type: TOO Total Time (ks): 100

PI Name: Jean in 't Zand

Our goal is to measure with the LETGS a series of bright type-I X-ray bursts with strong photospheric radius expansion ('superexpansion') to search for absorption edges due to the ashes of nuclear burning. We request a quick TOO, to be triggered by ISS-MAXI and Swift-BAT, with a total exposure time of 100 ks to obtain the detection of about 10 bursts.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
18:23:40.50	-30:21:40.00	4U 1820-30	ACIS-S	LETG	100

Subject Category: BH AND NS BINARIES

Proposal Number: 15400528

Title: Following a black hole X-ray transient as it transitions to quiescence

Type: TOO Total Time (ks): 135

PI Name: Richard Plotkin

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 (nearly) 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)
		TOO	ACIS-S	HETG	135

Subject Category: BH AND NS BINARIES

Proposal Number: 15400714

Title: Confirmation of the Symbiotic Nature of CXOGBS J173620.2-293338

Type: GO Total Time (ks): 25

PI Name: Robert Hynes

The Galactic Bulge Survey (GBS) detected 1640 faint bulge X-ray sources. CX332 lies within 1" of an asymptotic giant branch carbon star. Bulge carbon stars are extremely rare, so we estimate only a 0.1% of chance coincidence within 1" with ANY GBS source, so it is likely to be a symbiotic. The X-ray hardness and optical spectrum suggest it might be neutron star symbiotic X-ray binary (SyXB). It would be only the second SyXB with a carbon star, and the first based on a secure X-ray detection. A deeper observation will i) obtain a precise, on-axis X-ray position to confirm or refute the positional assocation; ii) obtain an X-ray spectrum to classify the symbiotic type; iii) search for the large amplitude variability typical of symbiotics, and possibly measure a neutron star spin period.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
17:36:20.20	-29:33:38.30	CXOGBS J173620.2-293338	ACIS-I	NONE	25

Subject Category: BH AND NS BINARIES

Proposal Number: 15400856

Title: The cooling neutron star in the super-Eddington accretor XTE J1701-462

Type: GO Total Time (ks): 115

PI Name: Jeroen Homan

Observing the cooling of neutron stars reheated by accretion provides new insights into neutron star structure. Using Chandra and XMM-Newton we have followed in unprecedented detail the cooling of the neutron star transient XTE J1701-462, which accreted at super- and near-Eddington rates for 1.6 years before returning to quiescence. A recent observation indicates that the source has now entered a phase of more rapid cooling after an extended period of much slower evolution. Here we propose to continue our successful monitoring of the source with a 115 ks observation early in Cycle 15, thus extending our tracking of the source from 5.2 to 6.5 years into quiescence. This will serve to constrain the current phase of rapid cooling and thereby the properties of the neutron star inner crust.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
17:00:58.50	-46:11:08.60	XTE J1701-462	ACIS-S	NONE	115

Subject Category: BH AND NS BINARIES

Proposal Number: 15400867

Title: Turning Down the Noise on Circinus X-1: A Deep Look at the Jets, Shocks, and Lobes at Low Background

Type: TOO Total Time (ks): 180

PI Name: Sebastian Heinz

We propose to observe Circinus X-1 in a 180ksec TOO at very low point source flux. This will allow us to (a) unambiguously determine the nature of the tentative excess X-ray emission from the edges of the radio lobes, (b) map synchrotron aging across the shocks detected in a 2009 observation (c) search for thermal emission from the forward shock, (d) search for X-ray evidence of jet bending, and (e) determine the nature of the compact X-ray emission along the radio jets. The observation will allow us to measure the jet power and the age of the synchrotron nebula and to constrain the dynamics of the jet. We ask for 11 ksec of joint Swift time to verify our trigger criteria.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
15:20:40.90	-57:10:00.20	Circinus X-1	ACIS-S	NONE	180

Subject Category: BH AND NS BINARIES

Proposal Number: 15400870

Title: Narrow Lines from a Slowly Rotating Neutron Star

Type: TOO Total Time (ks): 150

PI Name: Deepto Chakrabarty

The detection and identification of photospheric absorption lines from a neutron star would allow measurement of their gravitational redshift and hence the neutron star compactness. In principle, the line shape would allow unique determination of M and R. 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, 20x 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

Subject Category: BH AND NS BINARIES

Proposal Number: 15400871

Title: Confronting IC 10 X-1: Does the Most Massive Stellar Black Hole Also Have the Most Extreme Spin?

Type: GO Total Time (ks): 150

PI Name: James Steiner

IC 10 X-1 shattered all mass records for stellar black holes. The fact that it eclipses significantly constrains its inclination and its distance is known because it resides in IC 10. These three quantities, mass, inclination and distance, are the key input parameters needed to derive spin from the thermal spectrum of a black hole. However, at a flux of 0.1 mCrab, we are stymied by a lack of signal at the highest energies, which prevents us from measuring its spin. Only through a coordinated effort combining NuSTAR's high energy sensitivity and Chandra pristine optics and low energy sensitivity can this be done. At the core of this study is a question: will IC 10 X-1, like the other HMXBs have a high spin?

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
00:20:29.10	+59:16:51.90	IC 10 X-1	ACIS-I	NONE	150

Subject Category: BH AND NS BINARIES

Proposal Number: 15400876

Title: Resolving a New Hyper-luminous X-ray Source in NGC 1511

Type: GO Total Time (ks): 40

PI Name: Sean Farrell

We have recently discovered a new candidate hyper-luminous X-ray source coincident with the starburst galaxy NGC 1511 in archival XMM-Newton data. At the galaxy's distance the luminosity is ~1E42 erg/s, equivalent to the brightest known ULX and strongest intermediate mass black hole candidate ESO 243-49 HLX-1. However, the source is confused in the XMM images, leading to a high level of uncertainty in both the spectral shape and luminosity. We request observations with Chandra in order to disentangle this source from the other sources of emission, pin-point its position, and accurately constrain the spectrum and luminosity. We will also seek simultaneous radio observations of a possible radio counterpart in order to constrain the black hole mass using the black hole fundamental plane.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
03:59:41.70	-67:38:20.00	XMMU J035941.7-673820	ACIS-S	NONE	40

Subject Category: BH AND NS BINARIES

Proposal Number: 15400896

Title: High-resolution X-ray spectroscopy of the X-ray burster and 11 Hz pulsar IGR J17480-2446

Type: GTO/TOO Total Time (ks): 150

PI Name: Claude Canizares

The detection and identification of photospheric absorption lines from a neutron star would allow measurement of their gravitational redshift and hence the neutron star compactness. In principle, the line shape would allow unique determination of M and R. 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, 20x 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

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500072

Title: Measuring the Proper Motion of the Quiet Pulsar Calvera

Type: GO Total Time (ks): 30

PI Name: Jules Halpern

Calvera is a 59 ms X-ray pulsar at high Galactic latitude that was selected from the ROSAT All-Sky Survey. The absence of a PWN, radio, or gamma-ray emission, suggested that Calvera is a passively cooling NS and a nearby candidate for the elusive descendants of the central compact objects (an orphaned CCO). We recently measured the spin-down rate of Calvera, which, on the contrary, shows that it is surprisingly energetic. This makes it very difficult to understand its location and relative silence. In any scenario for Calvera's birth, whether in the Galactic disk or halo, its proper motion vector could be large and easily measured by Chandra, which will shed light on its origin. Deep optical images will help determine its distance and emission mechanisms.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
14:12:59.30	+79:19:58.20	CXOU J141259.3+791958	HRC-I	NONE	30

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500090

Title: A Fifteen-Year Ephemeris for the CCO Pulsar in Puppis A

Type: GO Total Time (ks): 99

PI Name: Jules Halpern

We detected spin-down of the pulsar in Puppis A, which requires a dipole magnetic field of only 2.8e10 G, the smallest of any young neutron star. This confirms the anti-magnetar scenario for CCOs. PSR J0821-4300 also has an X-ray spectral feature that is either an emission line at 0.75 keV or an absorption line at 0.46 keV, which is consistent with an electron cyclotron resonance at roughly the spin-down magnetic field strength. We propose to extend the time span of the ephemeris from 3 years to 15 years by linking new and archival data, measuring the spin-down rate to 0.1 percent and seeing if it is stable over this time span. This will test for any torque noise due to accretion of supernova ejecta, which is the most plausible mechanism for generating an emission line in the spectrum.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
08:21:57.30	-43:00:17.30	PSR J0821-4300	ACIS-S	NONE	99

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500152

Title: Measuring the Explosion Geometry of Short GRBs: Implications for Energetics and Rates

Type: TOO Total Time (ks): 60

PI Name: Wen-Fai Fong

Short GRB afterglows can provide a wealth of information on fundamental properties such as energy and geometry. The geometry is of particular interest because it affects the true energy scale and event rates, with implications for the explosion physics and progenitors. The collimation angles are measured from "jet breaks" in the afterglow light curves, yet only 2 short GRB jet breaks have been discovered so far (both with Chandra) due to the faintness of the optical and radio emission. To probe the relevant range of angles we require Chandra observations at ~5-20 days. Here we propose follow-up for a short GRB with a bright X-ray afterglow (determined from Swift/XRT at <1 day), which will allow us to measure angles of 5-15 deg, or place a meaningful lower bound of >10-20 deg.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
		Short-GRB-1	ACIS-S	NONE	60

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500155

Title: CHANDRA CYCLE 15 SPATIAL AND SPECTRAL MONITORING OF SN 1987A

Type: GO Total Time (ks): 150

PI Name: David Burrows

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 15.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
05:35:28.00	-69:16:11.10	SN 1987A	ACIS-S	HETG	75
05:35:28.00	-69:16:11.10	SN 1987A	ACIS-S	HETG	75

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500176

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

Type: TOO Total Time (ks): 70

PI Name: Andrea Tiengo

In 2009 we discovered, around the magnetar 1E 1547.0-5408, three bright X-ray expanding rings due to scattering of the radiation of a strong burst by three dust layers in our Galaxy. We propose rapid follow-up observations with Chandra in the case that a similar phenomenon is again detected 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. This proposal was accepted in Cycle 12, 13 and 14, but it has not been triggered yet.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
		Magnetar scattering halo	ACIS-I	NONE	70

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500190

Title: Pre-Planned Target of Opportunity (ToO) Observations of the Crab Nebula upon the Occurrence of the Next Gamma-Ray Flare

Type: TOO Total Time (ks): 70

PI Name: Martin Weisskopf

The Crab Nebula (with its central pulsar) has been an emblematic source in high-energy astrophysics for nearly fifty years and remains a continuing source of scientific stimulus. The recent stunning discovery of rapid g-ray variability (up to 1 GeV) demonstrates that the nebula differs from the description found in most recent theoretical models. Our scientific objective is to locate the source of these g-ray flares, which would be a giant step toward understanding them.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
05:34:31.60	+22:00:56.40	Crab	HRC-S	LETG	70

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500198

Title: Joint Chandra and HST Monitoring and Studies of the Crab Nebula

Type: GO Total Time (ks): 120

PI Name: Martin Weisskopf

The scientific purpose of this proposal is three-fold: (1) Continue to quantify and correlate the Crab s X-ray and optical, temporal and spatial variations, developing a legacy database for high-spatial-resolution studies of this astrophysical archetype; (2) identify and explore phenomena responsible for the recently discovered fact that the Crab is not a standard candle in hard X-rays; and (3) establish X-ray and optical baselines, to aid in determining the location and physics of the Crab s gamma-ray flares.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
05:34:31.60	+22:00:56.40	Crab	ACIS-S	NONE	120

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500264

Title: Calcium rich transients: tidal detonations of white dwarfs?

Type: TOO Total Time (ks): 40

PI Name: Thomas Maccarone

We propose for a 40 kilosecond TOO observation of a new Ca-rich gap transient. These enigmatic objects, with properties intermediate between those of classical novae and Type Ia supernovae, can be well-explained by tidal detonations of low mass white dwarfs by intermediate mass black holes. In such a case, fall-back accretion of the tidal debris would power an X-ray source for which we propose to search. Because supermassive black holes will swallow white dwarfs whole, a successful outcome to this proposal would both explain the Ca-rich gap transients *and* establish the existence of intermediate mass black holes.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
		Ca-rich gap transient	ACIS-S	NONE	40

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500269

Title: SN 2012hn: a tidal detonation event?

Type: GO Total Time (ks): 30

PI Name: Thomas Maccarone

We propose for a 30 kilosecond observation of SN 2102hn, a Ca-rich gap transient. These enigmatic objects, with properties intermediate between those of classical novae and Type Ia supernovae, can be well-explained by tidal detonations of low mass white dwarfs by intermediate mass black holes. In such a case, fall-back accretion of the tidal debris would power an X-ray source for which we propose to search. Because supermassive black holes will swallow white dwarfs whole, a successful outcome to this proposal would both explain the Ca-rich gap transients *and* establish the existence of intermediate mass black holes.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
06:42:42.60	-27:26:49.80	SN 2012hn	ACIS-S	NONE	30

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500319

Title: Tracing the X-ray emission from Type IIn supernovae

Type: TOO Total Time (ks): 80

PI Name: Poonam Chandra

Type IIn supernovae (SNe IIn) are a heterogeneous class of supernovae believed to be powered by dense circumstellar interaction. However, neither their evolutionary status nor the origin of the tremendous mass loss from their progenitors is known. X-ray emission from shock heated gas is crucial for the energetics of the interaction and serve as a crucial diagnostic. X-rays combined with multiwavelength studies can constrain the progenitor systems and lead to a wealth of information about the surrounding medium, ejecta density, and structure of SNe IIn. Here we request joint Chandra and Swift-XRT time and propose to do Chandra-ACIS Spectroscopy at two epochs, of one Type IIn supernova that has optical emission brighter than $-19$ absolute magnitude and has been detected by Swift-XRT.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
		SN-IIN	ACIS-S	NONE	80

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500322

Title: Testing the shock interaction hypothesis for hydrogen-poor super luminoius supernova

Type: TOO Total Time (ks): 60

PI Name: Eran Ofek

SLSN-I are a class of bright supernovae (SNe) with peak absolute magnitude in excess of -21, relatively long rise time, and no hydrogen or helium signature in their spectra. The nature of these SNe is unclear. Here we suggest a Chandra 60ks Target of Opportunity program that will enable to test if SLSN-I are powered by interaction of a SN ejecta with massive circum-stellar matter. The goal of the proposed Chandra observations is to look for X-ray emission at both early and late times, and to resolve the puzzle of their power source. We suggest to observe a single SLSN-I event which luminosity distance is smaller than 500 Mpc.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
		ToO-early	ACIS-S	NONE	60

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500363

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

Type: TOO Total Time (ks): 105

PI Name: Victoria Kaspi

In 2006 observations of a high-magnetic-field rotation-powered pulsar (RPP), we observed a sudden "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
07:26:08.10	-26:12:38.10	PSR J0726-2612	ACIS-S	NONE	105
08:47:57.00	-43:16:57.20	PSR J0847-4316	ACIS-S	NONE	105
11:19:14.30	-61:27:49.50	PSR J1119-6127	ACIS-S	NONE	105
16:32:39.70	-48:18:52.60	PSR J1632-4818	ACIS-S	NONE	105
17:18:10.00	-37:18:53.00	PSR J1718-3718	ACIS-S	NONE	105
17:26:07.50	-35:29:58.00	PSR J1726-3530	ACIS-S	NONE	105
17:34:26.60	-33:33:22.00	PSR J1734-3333	ACIS-S	NONE	105
18:14:43.10	-17:44:48.00	PSR J1814-1744	ACIS-S	NONE	105
18:19:33.80	-14:58:01.00	PSR J1819-1458	ACIS-S	NONE	105
18:21:34.30	-14:19:26.00	PSR 1821-1419	ACIS-S	NONE	105
18:47:35.20	-01:30:46.00	PSR J1847-0130	ACIS-S	NONE	105
19:13:50.80	+04:46:06.00	PSR J1913+0446	ACIS-S	NONE	105
19:18:23.60	+14:45:06.00	PSR B1916+14	ACIS-S	NONE	105
		New High-B pulsar	ACIS-S	NONE	105
10:01:32.20	-59:39:17.80	PSR J1001-5939	ACIS-S	NONE	105
17:40:33.80	-30:15:43.50	PSR B1737-30	ACIS-S	NONE	105

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500376

Title: The remarkable X-ray evolution of SN 2010jl

Type: GO Total Time (ks): 40

PI Name: Poonam Chandra

SN 2010jl is a bright Type IIn (narrow line) supernova (SN) shown to have luminous X-ray emission. Our three Chandra ACIS-S observations taken at 2, 12, and 20 months after the SN discovery show dramatically different spectra primarily due to strong evolution of the X-ray absorption. The spectra indicate high temperatures and high absorbing column densities. This is the first time an external circumstellar X-ray absorption has been clearly observed in a SN, giving us a rare opportunity to follow the evolution of the external column density and obtain unique information on circumstellar structure and the shock interaction. In this proposal we request a 40 ks of Chandra ACIS-S observation of SN 2010jl during Cycle 15.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
09:42:53.30	+09:29:41.80	SN 2010jl	ACIS-S	NONE	40

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500421

Title: Unveiling the nature of cyclical behavior in the period evolution of the Anomalous X ray Pulsar XTE J1810-197

Type: GO Total Time (ks): 40

PI Name: Federico Bernardini

This program is aimed at obtaining a phase-coherent timing solution for the period evolution of XTEJ1810-197 (XTEJ), continuing the successful X-ray monitoring of this unique Anomalous X-ray Pulsar (AXP).AXPs are Magnetars, isolated neutron star (NS) whose emission is likely due to the decay of an extremely strong magnetic field, 10e+(14-15) G.The requested pointings are aimed at studying the period evolution of XTEJ, by means of phase connected timing analysis, with the goal of demonstrating the presence of a long term (5 yr) precession of its rotation axis. XTEJ could be a unique precessing Magnetar (only 3 candidate precessing NSs are known).This would shed light on the physical properties of the NS crust/core core and on the physical properties of matter at extremely high density.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
18:09:51.10	-19:43:51.90	XTEJ 1810-197	ACIS-S	NONE	40

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500430

Title: Identification of the Host Galaxy of Swift Short GRBs by the Chandra Sub-arcsecond Position

Type: TOO Total Time (ks): 40

PI Name: Takanori Sakamoto

We propose a continuation of our successful ToO program to observe short GRBs detected by Swift to identify the afterglow in X-rays by a sub-arcsecond position from Chandra. Our ToO program will increase the number of short GRBs having an unambiguous host galaxy identification, and also should provide a much less biased sample host galaxies of short GRBs. We request a maximum of 2 ToOs for 20 ksec each based on the estimation of previous Swift short GRB observations. Our trigger criteria are 1) Swift short GRBs localized by Swift/XRT and 2) no afterglow confirmation in optical within 5 hours after the burst. We request <1-3 days response to our ToO, so that the afterglow can be observed while still bright.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
		Short GRB ToO	ACIS-S	NONE	20
		Short GRB ToO	ACIS-S	NONE	20

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500437

Title: PROMPT STUDY OF MAGNETAR OUTBURSTS WITH CHANDRA

Type: TOO Total Time (ks): 85

PI Name: Nanda Rea

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)
		NEWMAGNETAR	ACIS-S	NONE	85
10:50:07.10	-59:53:21.40	1E1048.1-5937	ACIS-S	NONE	85
17:08:46.00	-40:08:53.00	RXSJ170849-400910	ACIS-S	NONE	85
18:41:19.40	-04:56:10.90	1E1841-04	ACIS-S	NONE	85
18:44:54.70	-02:56:53.40	AXJ1844-0256	ACIS-S	NONE	85
20:13:52.80	+34:19:55.20	SGR 2013+34	ACIS-S	NONE	85
23:01:08.30	+58:52:44.50	1E 2259+584	ACIS-S	NONE	85
19:07:14.30	+09:19:20.10	SGR 1900+14	ACIS-S	NONE	85
16:35:51.80	-47:35:23.30	SGR 1627-41	ACIS-S	NONE	85
18:08:39.30	-20:24:39.50	SGR 1806-20	ACIS-S	NONE	85
05:26:00.90	-66:04:36.30	SGR 0526-66	ACIS-S	NONE	85
05:01:06.20	+45:16:35.00	SGR 0501+4516	ACIS-S	NONE	85
15:50:55.30	-54:19:02.00	1E 1547.0-5408	ACIS-S	NONE	85
18:46:24.50	-02:58:28.00	PSR J1846-0258	ACIS-S	NONE	85
18:33:44.40	-08:31:07.70	SGR 1833-0832	ACIS-S	NONE	85
16:22:44.80	-49:50:54.40	PSR 1622-4950	ACIS-S	NONE	85
17:14:05.70	-38:10:30.90	CXO 171405-381031	ACIS-S	NONE	85
18:22:18.00	-16:04:26.80	Swift 1822-1606	ACIS-S	NONE	85
16:47:10.20	-45:52:17.00	CXO J164710.2-455216	ACIS-S	NONE	85
04:18:33.90	+57:32:22.90	SGR 0418+4729	ACIS-S	NONE	85
01:46:22.40	+61:45:03.30	4U0142+614	ACIS-S	NONE	85
18:34:52.10	-08:45:56.00	Swift 1834-0836	ACIS-S	NONE	85
01:00:43.10	-72:11:34.00	CXOUJ0100-7211	ACIS-S	NONE	85

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500567

Title: DEEP CHANDRA IMAGING OF THE GAMMA-RAY ONLY PULSAR PSR J1135-6055 AND ITS BENT JETS

Type: GO Total Time (ks): 100

PI Name: Andrea De Luca

The Large Area Telescope (LAT) onboard the Fermi mission opened a new era for pulsar astronomy, detecting pulsations from more than 100 gamma-ray pulsars, about 30% of which are not seen at radio wavelengths. One of the most recent entries in the -ray only family is PSR J1135-6055, an energetic pulsar located at a few kpc, likely associated to the radio supernova remnant G293.8+0.6. An archival 35ks observation unveils a peculiar pulsar wind nebula, reminiscent of a pair of anti-podal jets originating from the pulsar and bending in the ISM.We propose a deep ACIS-S observation of the system, in order to assess the morphology of the diffuse features. Chandra imaging and spatially-resolved spectroscopy of this nebula could teach us a lot about pulsar winds.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
11:35:08.30	-60:55:36.50	PSR J1135-6055	ACIS-S	NONE	100

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500573

Title: Following the Temperature of a Neutron Star

Type: GO Total Time (ks): 30

PI Name: Patrick Slane

Chandra observations of the neutron star in Cas A have revealed a stunning decrease in its X-ray flux and surface temperature over the course of less than 10 years. This rapid cooling implies the onset of a phase change to neutron superfluidity in the neutron star interior, and places strong constraints on nucleon pairing and the neutron star mass. We propose an observation of 1WGA J1713.4-3949, the young neutron star in the supernova remnant G347.3-0.5, to search for any evidence of a similar associated flux decline since its initial observation in Chandra Cycle 1. Detection of such cooling will strengthen constraints on the complex physics of neutron star interiors.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
17:13:28.00	-39:49:48.00	1WGA J1713.4-3949	ACIS-I	NONE	30

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500577

Title: Where Have All The Central Compact Objects Gone?

Type: GO Total Time (ks): 63

PI Name: Eric Gotthelf

The central compact object class of young neutron stars in supernova remnants are detected only as thermal X-ray sources. Characterized by weak magnetic fields, a fundamental puzzle of their evolution is the absence of any evidence for their numerous descendants in X-ray or radio surveys. We know that their characteristic timing ages are much older than their real ages, which implies that some apparently old radio pulsars may actually be "orphaned CCOs" that are young enough to detect as cooling X-ray sources. Here we propose a small survey of radio pulsars with similarly weak B-fields as CCOs to see if we can find young, bright ones that qualify as immediate descendants of CCOs.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
00:51:30.10	+04:22:49.00	PSR J0051+0423	ACIS-S	NONE	3.5
01:37:23.80	+16:54:42.10	PSR J0137+1654	ACIS-S	NONE	3.5
03:35:16.60	+45:55:53.40	PSR J0335+4555	ACIS-S	NONE	3.5
05:20:36.10	-25:53:12.20	PSR J0520-2553	ACIS-S	NONE	3.5
06:56:48.90	-54:49:14.90	PSR J0656-5449	ACIS-S	NONE	3.5
14:10:07.30	-74:04:53.30	PSR J1410-7404	ACIS-S	NONE	3.5
16:07:48.70	-64:49:43.00	PSR J1607-6449	ACIS-S	NONE	3.5
16:27:52.50	-59:36:55.30	PSR J1627-5936	ACIS-S	NONE	3.5
16:52:16.60	-14:00:27.40	PSR J1652-1400	ACIS-S	NONE	3.5
18:07:38.00	-08:47:43.20	PSR J1807-0847	ACIS-S	NONE	3.5
18:13:38.70	+18:22:15.00	PSR J1813+1822	ACIS-S	NONE	3.5
19:11:55.30	+17:58:45.70	PSR J1911+1758	ACIS-S	NONE	3.5
21:56:23.70	+26:18:30.40	PSR J2156+2618	ACIS-S	NONE	3.5
22:23:03.20	+29:23:58.60	PSR J2222+2923	ACIS-S	NONE	3.5
23:07:41.20	+22:25:50.10	PSR J2307+2225	ACIS-S	NONE	3.5
13:34:30.10	-58:39:16.50	PSR J1334-5839	ACIS-S	NONE	3.5
17:55:41.80	-27:25:45.00	PSR J1755-2725	ACIS-S	NONE	3.5
20:48:45.80	+22:55:05.30	PSR J2048+2255	ACIS-S	NONE	3.5

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500590

Title: The collimation and energetics of short gamma-ray bursts

Type: TOO Total Time (ks): 120

PI Name: Eleonora Troja

The degree of collimation in short GRBs is a key issue, bearing critical information on the true energy release, the event rate and the nature of the GRB progenitor. The geometry of the GRB outflow can be constrained through afterglow observations, and, in particular, through the measurement of the so-called ``jet-breaks''. The intrinsic faintness of short GRB afterglows prevents jet-breaks to be detected with Swift/XRT observations. We propose to overcome this limit by triggering deep Chandra ToOs observations of short GRB afterglows.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
		GRB	ACIS-S	NONE	60
		GRB	ACIS-S	NONE	60

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500612

Title: What is the Magnetic Field of Magnetar Swift J1822.3-1606?

Type: GO Total Time (ks): 90

PI Name: Victoria Kaspi

In recent years, the mean magnetic field of known magnetars has been lowered by discoveries of sources with magnetic fields < 1x10^14 G. In particular, Swift J1822.3-1606 and SGR 0418+5729 appear to have fields that are ~1x10^13 G. This begs the question of how low the true magnetic field distribution of magnetars stretches and whether it is in fact distinct from that of the main pulsar population. Here we propose to perform phase-coherent timing of Swift J1822.3-1606 with Chandra. With our proposed timing campaign we will be able to distinguish between ambiguous measurements now present in the literature and determine the true spin-inferred magnetic field of this interesting object.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
18:22:18.10	-16:04:25.50	Swift J1822.3-1606	ACIS-S	NONE	90

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500616

Title: Constraining the Energetics of Fermi-LAT GRBs with Chandra

Type: TOO Total Time (ks): 120

PI Name: Judith Racusin

We propose to observe late-time X-ray afterglows of the most energetic subset of Fermi-LAT detected GRBs in order to constrain their jet break times, opening angles, and collimation corrected energy outputs. This new and exceptional population of GRBs demonstrate several new features not previously observed, and appear to be brighter on average than Swift-era optical and X-ray afterglows, which makes them excellent candidates for broadband observations and detailed modeling. Observations of the X-ray afterglows by Swift-XRT usually do not reveal jet break signatures in these objects, suggesting that they occur later when the afterglows are too faint for XRT, but possibly still observable by Chandra.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
		GRB AO15-1	ACIS-S	NONE	60
		GRB AO15-2	ACIS-S	NONE	60

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500621

Title: Dynamics of a Type Ia SNR: Proper Motions in Tycho

Type: GO Total Time (ks): 150

PI Name: Brian Williams

Type Ia SNe are of fundamental importance in astrophysics, yet the nature of their environments and progenitor systems is poorly understood. We propose a new epoch of imaging of Tycho's SNR, with the goal of expanding the baseline for proper motions to as many as 14 years. In a recent work, we have shown that the ISM surrounding Tycho is non-uniform, in agreement with the limited proper motion studies that have been done in radio and X-rays. The dynamics of the forward shock can be used to localize the explosion site. A new epoch will also allow the first ever study of ejecta dynamics in a Type Ia SNR, including the proper motion of individual elements, which reflect the ejecta structure at the time of explosion and can distinguish between various explosion models for Type Ia SNe.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
00:25:19.30	+64:07:55.60	Tycho	ACIS-I	NONE	150

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500730

Title: REVISITING TWO OF THE BRIGHTEST TYPE IINS: HOW THE MIGHTY ARE FALLING - AND PERHAPS RISING AGAIN

Type: GO Total Time (ks): 115

PI Name: Vikram Dwarkadas

Type IIn Supernovae (SNe) form the highest luminosity class of X-ray SNe, excluding those associated with gamma-ray bursts. Yet their progenitors remain a mystery. In this proposal we aim to investigate two of the brightest Type IIn SNe, SN 2005kd and SN 2006jd. SN 2005kd appeared to be fading most rapidly, but then brightened again last year, leading to a very interesting evolution. SN 2006jd has a reasonably well-sampled light curve, although the high-temperature spectrum has been difficult to constrain. Coupling this spectrum with previous data, and hydrodynamical simulations, we will model the evolution of the X-ray emission, use it to place limits on the ambient medium density, and thereby the SN progenitor, providing clues to the progenitors of Type IIn SNe.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
04:03:16.90	+71:43:18.90	SN 2005kd	ACIS-S	NONE	30

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500737

Title: State of the shocked plasma: X-ray and radio signatures from type IIP supernovae

Type: TOO Total Time (ks): 160

PI Name: Alak Ray

Type IIP Supernovae arise from massive stars that end their lives as Red Supergiants. Shock wave from the explosion interacts with a complex circumstellar medium originating from the parent star in winds or episodic ejections. Particles can be accelerated to relativistic energies which radiate by synchrotron process in the shock-amplified magnetic fields and inverse Compton scattering against optical/ UV photons from the supernova. Thermal emission can result from the reverse shock reheating the expanding cold ejecta. These processes have different signatures in radio and X-ray bands which can be disentangled in bright events. Multiple Chandra observations can probe the history of variable mass loss from the progenitor star.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
		SN IIP ToO	ACIS-S	NONE	160

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500763

Title: Dynamics of the Remnant of Kepler's Type Ia Supernova

Type: GO Total Time (ks): 150

PI Name: Kazimierz Borkowski

The remnant of Kepler's Type Ia SN shows an interaction of SN ejecta with a highly asymmetric ambient circumstellar medium (CSM). This material was ejected by a single-degenerate progenitor prior to the explosion, and its complex spatial distribution contains invaluable information about the progenitor itself. We propose a third-epoch observation of Kepler's SNR that will provide us with much improved expansion rates, allowing for measurements of shock speeds along the whole periphery of the remnant. These measurements will be compared with 3-D hydrodynamic simulations, thus unraveling the true shape of the CSM in a Type Ia progenitor. They will also advance our knowledge of poorly-understood particle acceleration and magnetic field amplification processes in fast SNR shocks.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
17:30:41.20	-21:29:31.40	Kepler's Supernova Remnant	ACIS-S	NONE	150

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500831

Title: The Energetics and Environments of Type Ibc Supernovae

Type: TOO Total Time (ks): 20

PI Name: Alicia Soderberg

Twenty-five years have passed since the peculiar class of Type Ibc supernovae were first recognized as a distinct flavor of core-collapse explosions. Their low volumetric rate and optical heterogeneity did not initially motivate strong observational programs. SNe Ibc have enjoyed a surge of interest thanks to the observational realization that most long-duration gamma-ray bursts (GRBs) are accompanied by SNe Ibc. The converse, however, is not true: we recently measured the fraction of SNe Ibc harboring relativistic GRB jets to be just 1%. The progenitors of SNe Ibc and their relation to those of GRB-SNe have yet to be observationally identified. Here we propose a modest Chandra program to enable progress.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
		SN1	ACIS-S	NONE	10
		SN2	ACIS-S	NONE	10

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500874

Title: DEEP STUDY OF THE 20PC-LONG PRECESSING JET IN IGR J11014-6103

Type: GO Total Time (ks): 250

PI Name: Lucia Pavan

IGR J11014-6103 is a unique X-ray emitter comprising: (1) a run-away pulsar with the highest known kick velocity to date, (2) an elongated wind nebula trailing behind it (detected in radio and X-rays), and (3) a collimated jet-like feature extending over 20 parsecs. The peculiar shape and orientation of this feature suggests this could be the most elongated precessing pulsar jet ever detected in our Galaxy. Due to the limited exposure time of the data available so far however two competing scenarios still remain to be investigated. With this proposal, we aim at unveiling the real nature of the jet through a 250 ksec observation of IGR J11014-6103 with Chandra/ACIS-I, fully exploiting the unique high angular resolution and large field-of-view capabilities of this instrument.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
11:01:45.00	-61:01:39.60	IGR J11014-6103	ACIS-I	NONE	250

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 15500895

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

Type: TOO Total Time (ks): 120

PI Name: Andrew Fruchter

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

Subject Category: NORMAL GALAXIES: DIFFUSE EMISSION

Proposal Number: 15610373

Title: Detecting the hot gaseous halo around an extremely massive and relativistic jet launching spiral galaxy

Type: GO Total Time (ks): 100

PI Name: Stephen Walker

Here we propose to observe the extremely massive, rapidly rotating, relativistic jet launching, spiral galaxy 2MASX J23453268-0449256 to detect its hot halo and measure its mass content. The optical data indicate there is a huge central concentration of mass, including a SMBH, but X-ray observations are needed to determine its mass. It is extremely rare for a massive spiral galaxy to eject relativistic jets, as they are nearly always launched from the nuclei of bulge dominated ellipticals and not flat spirals. It is clear that J2345-0449 is an extremely rare system whose properties challenge the standard paradigm for the formation of relativistic jets in AGN. Detailed X-ray observations are necessary to fully understand this system and complement the excellent GMRT and VLA radio data.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
23:45:32.60	-04:49:23.40	2MASX J23453268-0449256	ACIS-S	NONE	100

Subject Category: NORMAL GALAXIES: DIFFUSE EMISSION

Proposal Number: 15610450

Title: The Missing Baryons Around Early-Type Galaxies

Type: GO Total Time (ks): 120

PI Name: Joel Bregman

Based on their stellar and cool gas content, galaxies are missing most of their baryons, yet additional gas may lie in a hot multi-million degree halo stretching to the virial radius. Our ROSAT stacking analysis shows that the average galaxy possesses only a modest extended gas halo, but studies of two individual isolated elliptical galaxies indicate that such massive halos exist. To investigate this difference, we propose observations of two ellipticals with specially designed observations that minimize systematic uncertainties. The derived halo masses will show if the gas mass to dark matter ratio is nearly constant of if it varies greatly between galaxies. These gas masses and radial distributions are fundamental quantities, critical in constraining galaxy formation models.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
01:49:04.60	-14:58:29.00	NGC 682	ACIS-S	NONE	60
01:58:18.20	-54:12:57.00	ESO 153-G003	ACIS-S	NONE	60

Subject Category: NORMAL GALAXIES: DIFFUSE EMISSION

Proposal Number: 15610544

Title: Hot X-ray Coronae: A Unique Probe of Galaxy Formation Models

Type: GO Total Time (ks): 170

PI Name: Akos Bogdan

The presence of hot gaseous coronae in the dark matter halos of massive galaxies is a basic prediction of galaxy formation models, yet observations of such coronae are very scarce. We propose to test galaxy formation models by characterizing the outer hot coronae of two massive spiral galaxies. The selected galaxies are optically luminous, undisturbed, have low star formation rates, and can be probed to large radii within the Chandra field-of-view. We will measure the properties of the hot coronae, furthermore we will construct density, temperature, and abundance profiles. Confronting the observed properties of the coronae with those predicted by state-of-the art galaxy formation models, will allow us to probe fundamental physical processes that influence galaxy formation.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
00:49:47.80	+32:16:39.80	NGC266	ACIS-I	NONE	90

Subject Category: NORMAL GALAXIES: DIFFUSE EMISSION

Proposal Number: 15610735

Title: A Study of Hydrodynamic Instabilities in the Major Merger of Galaxy Groups NGC7618 and UGC12491

Type: GO Total Time (ks): 240

PI Name: Marie Machacek

NGC7618/UGC12491 is the best nearby examples of the merger of two equal mass galaxy groups. Their dramatically distorted X-ray cold fronts suggest the presence of Kelvin Helmholtz Instabilities (KHI). We propose 120 ks ACIS-S observations of NGC\,7618 and UGC\,12491 to measure the gas temperatures, metal abundances, densities, pressures and entropy in these distorted features to determine their origin and gas flow histories. We will measure the limiting observable size for KHI instabilities and improve constraints on effective gas viscosity along the cold front boundaries.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
23:19:47.20	+42:51:09.50	NGC7618	ACIS-S	NONE	120
23:18:38.30	+42:57:28.90	UGC12491	ACIS-S	NONE	120

Subject Category: NORMAL GALAXIES: DIFFUSE EMISSION

Proposal Number: 15610786

Title: A First Look at Giant Bulge-Dominated Low-Surface Brightness Galaxies

Type: GO Total Time (ks): 155

PI Name: Jimmy Irwin

Low surface brightness galaxies (LSBs) might appear optically unimpressive, but the largest LSBs contain as many stars as the largest normal elliptical and spiral galaxies. Next to nothing is known about their X-ray properties. We propose moderate length Chandra observations of three giant, bulge-dominated LSBs that cover over an order of magnitude in L_K to firmly detect for the first time the expected hot gaseous bulge emission from these systems, and compare their L_X/L_K scaling relation with normal early-type spiral bulges/ellipticals. We will also search for ULXs in the faint disks of these intriguing systems.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
02:27:45.90	+28:12:32.00	UGC 1922	ACIS-S	NONE	45

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 15620082

Title: [NeV] Emission and Ultraluminous X-ray Sources in Two Low-metallicity Blue Compact Dwarf Galaxies

Type: GO Total Time (ks): 85

PI Name: Trinh Thuan

We propose to observe two extremely metal-poor Blue Compact Dwarf (BCD) galaxies, Tol 1214-277 and HS0837+4717, as nearby proxies for studying hard radiation at high z. These BCDs are remarkable due to their strong [Ne V] 3426 emission, i.e., ionizing radiation with E>100eV. We wish to verify directly with Chandra that each BCD contains an X-ray source with L(X)>~1e39 erg/s, as predicted by photoionization models. We expect modest yet robust detections which can highlight spectral extremes and XRB locations relative to [Ne V]. Null detections would provide strong constraints for ionization models. By enlarging the number of known BCDs with ULXs (7 to date) and ULX/[Ne V] detections (1), we will be able to investigate trends of L(X) with other BCD properties.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
12:17:17.10	-28:02:32.70	Tol1214-277	ACIS-S	NONE	30

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 15620105

Title: X-Rays from Lyman Break Analogs

Type: GO Total Time (ks): 94.8

PI Name: Philip Kaaret

The source of energetic photons that reionized the early universe remains uncertain. Early galaxies had low metallicity and recent population synthesis calculations suggest that the number and luminosity of high-mass X-ray binaries is enhanced in star-forming galaxies with low metallicity, offering a potentially important and previously overlooked source of reionization. We propose to measure the relation between star formation rate and X-ray luminosity in a sample of Lyman break analogs, local galaxies that strongly resemble high-redshift, star-forming galaxies, and test the predicted enhancement in X-ray luminosity. These observations are important to our understanding of reionization and the formation of early galaxies.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
00:55:27.50	-00:21:48.60	SDSS J005527.46-002148.6	ACIS-S	NONE	23
08:46:02.20	+52:31:59.10	SDSS J084602.23+523159.1	ACIS-S	NONE	7.4
08:24:13.10	+43:37:21.00	SDSS J082413.13+433721.0	ACIS-S	NONE	23.7
09:38:13.50	+54:28:25.10	SDSS J093813.50+542825.1	ACIS-S	NONE	15.7
23:07:03.70	+01:13:11.20	SDSS J230703.75+011311.2	ACIS-S	NONE	25

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 15620465

Title: 0.5-30 KEV IMAGING OF STARBURSTS WITH CHANDRA AND NUSTAR

Type: GO Total Time (ks): 75

PI Name: Ann Hornschemeier

We propose short 10-30 ks Chandra exposures of a sample of four starburst galaxies that will occur concurrently with priority A NuSTAR observations. With this 75 ks program, we will characterize binaries, ULX sources and accretion onto supermassive black holes. Such joint Chandra-NuSTAR observations were crucial to interpretation of the 0.5-30 keV emission from the nuclear region of NGC 253 in late 2012 (Lehmer et al. 2013). In this proposal, we seek to continue to leverage the combined power of the two facilities. The sample consists of the very nearby star-forming galaxies M82 and M83 at d=4 Mpc and the nearest two merging starburst galaxies, NGC 3310 and NGC 3256, which altogether will be observed by NuSTAR for 481 ks.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
09:55:52.20	+69:40:48.70	M82	ACIS-S	NONE	20
13:37:00.90	-29:51:56.70	M83	ACIS-I	NONE	30
10:38:45.90	+53:30:11.80	NGC 3310	ACIS-S	NONE	10
10:27:51.60	-43:54:18.00	NGC 3256	ACIS-S	NONE	15

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 15620687

Title: Chandra Observation of the Most Luminous Off-nuclear Intermediate-mass Black Hole Candidate

Type: GO Total Time (ks): 60

PI Name: Dacheng Lin

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, with a possible optical counterpart, at 1" from the host galaxy's centre. We require Chandra's supreme spatial resolution to confirm the off-nuclear nature and its association with the optical source. We recently proved that the host galaxy's central massive black hole is inactive, using Gemini spectra, making it very likely that our candidate is the most luminous off-nuclear IMBH known.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
14:17:11.00	+52:25:41.90	2XMM J141711.0+522541	ACIS-S	NONE	60

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 15620745

Title: The Effect of Intermediate-Luminosity Transients on the X-ray Luminosity Functions of Spiral Disks

Type: GO Total Time (ks): 130

PI Name: Breanna Binder

We aim to measure the fraction of X-ray transients (XRT) and their luminosity distribution in NGC~300 using two new ACIS-I observations and joint HST ACS/WFC3 imaging. X-ray point source populations are characterized by their X-ray luminosity functions (XLFs), which are typically constructed from a single ``snapshot'' exposure. Most XLFs do not extend below of 10^37 erg s^-1, and the consistency of the XLF on short timescales poorly constrained. The two new exposures of NGC~300 will be used to address two broad science goals: we will measure the XRT demographics in NGC~300 and investigate their impact on the XLF down to 5x10^35 erg s^-1, and we will co-add all observations to measure the XLF down to 10^35 erg s^-1. We will identify new faint X-ray sources and test HMXB evolution models.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
00:54:53.50	-37:41:04.00	NGC 300	ACIS-I	NONE	130

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 15620749

Title: Long-term X-ray and Optical Study of the Black Hole X-ray Binaries in the Elliptical Galaxy NGC 4472

Type: GO Total Time (ks): 75

PI Name: Steve Zepf

We propose to observe the Virgo elliptical NGC 4472 and its black hole binaries with Chandra for 25 ks once in each of the next three cycles. We also propose to obtain Gemini spectroscopy of the optical emission line from the black hole source RZ2109 over this same time interval. These data will be used to - 1) track the X-ray variability of RZ2109, 2) compare this variability seen in X-rays to that seen in the optical [OIII]5007 emission line, in order to constrain the overall spatial scale of this emission and the nature of this back hole source, 3) test for variability of the second globular cluster black hole X-ray source CXOU 1229410+0757442, and 4) use the time domain information to search for the presence of any new black hole sources in this galaxy.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
12:29:39.90	+07:55:30.00	XMMUJ122939.9 +075333	ACIS-S	NONE	75

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 15620805

Title: TESTING THE UNIVERSALITY OF THE STELLAR IMF USING CHANDRA

Type: GO Total Time (ks): 112

PI Name: Bret Lehmer

We propose to conduct moderately-deep Chandra observations of six relatively low-mass elliptical galaxies (sigma < 100 km/s; LK ~ 10^10 LK,sol) to identify bright LMXBs in these systems. We will test recent claims that the IMFs of massive ellipticals, which have been well observed by Chandra, are bottom heavy and contain a factor of 3-4 times fewer LMXBs per unit stellar mass than the low-mass ellipticals studied here. The Chandra observations needed to study even bright LMXBs in low-mass ellipticals are almost nonexistent and inadequate for such a test. Our program will also provide first constraints on the emission from LMXB populations in these systems and its scaling with stellar mass, which can be compared with Chandra Deep Field stacking of similar ellipticals out to z ~ 0.8.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
12:23:34.90	+06:04:54.20	NGC 4339	ACIS-S	NONE	34
12:25:41.70	+12:48:37.30	NGC 4387	ACIS-S	NONE	37
12:35:30.60	+12:13:15.40	NGC 4550	ACIS-S	NONE	19
12:35:38.00	+12:15:50.40	NGC 4551	ACIS-S	NONE	22

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 15620853

Title: Monitoring the Tidal Disruption of the Gas Cloud G2 As It Encounters Sgr A*

Type: LP Total Time (ks): 420

PI Name: Daryl Haggard

A dense, cold cloud (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. High-energy emission from the Sgr A*/G2 encounter will likely peak at pericenter and continue over the next several years as the material circularizes. We propose 9 ACIS-S monitoring observations (5 simultaneous with VLA) to study the radiation properties of Sgr A* as 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 as it is shocked and heated. Multiwavelength observations of this encounter will have a profound impact on our understanding of inefficient accretion flows into, and outflow from, massive black holes.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
17:45:40.00	-29:00:28.10	Sgr A*	ACIS-S	NONE	50
17:45:40.00	-29:00:28.10	Sgr A*	ACIS-S	NONE	50
17:45:40.00	-29:00:28.10	Sgr A*	ACIS-S	NONE	50
17:45:40.00	-29:00:28.10	Sgr A*	ACIS-S	NONE	50
17:45:40.00	-29:00:28.10	Sgr A*	ACIS-S	NONE	50
17:45:40.00	-29:00:28.10	Sgr A*	ACIS-S	NONE	40
17:45:40.00	-29:00:28.10	Sgr A*	ACIS-S	NONE	40
17:45:40.00	-29:00:28.10	Sgr A*	ACIS-S	NONE	40
17:45:40.00	-29:00:28.10	Sgr A*	ACIS-S	NONE	50

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700077

Title: The Variable Absorption and Disrupting X-ray Jet of the Broad Absorption Line Radio-Loud Quasar PG 1004+130

Type: GO Total Time (ks): 60

PI Name: William Brandt

We propose non-simultaneous joint Chandra (60 ks), XMM-Newton (60 ks), and HST (1 orbit) observations of the remarkable BAL RLQ PG 1004+130. These, in conjunction with our previous X-ray/UV coverage, will yield (1) one of the most comprehensive X-ray spectral monitoring campaigns of a variable BAL quasar undertaken, probing multi-year and multi-month timescales to constrain the nature of the X-ray absorber; (2) the highest S/N X-ray spectra of a BAL RLQ currently available, enabling modeling of X-ray absorption and the underlying continuum; and (3) the deepest X-ray imaging yet obtained of a disrupting jet in a hybrid morphology radio source, allowing tests for jet flux variability and characterization of the morphologies and spectra of the jet and diffuse emission.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
10:07:26.10	+12:48:56.20	PG 1004+130	ACIS-S	NONE	60

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700078

Title: Triggering Chandra to Detect an X-ray Counterpart to TeV Flaring from M87 During Cycle 15

Type: TOO Total Time (ks): 35

PI Name: Daniel Harris

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

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700081

Title: Keeping Tabs on the Unique Jet in M87 During Cycle 15

Type: GO Total Time (ks): 10

PI Name: Daniel Harris

We request 2 observations of the M87 jet at 5 ks each. The first should be at the end of Nov 2013 and the second in 2014 Apr. 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 Mar): if we were to find a substantial change, a DDT request would be instigated. (3) To obtain quasi simultaneous X-ray and UV (HST proposal) data in order to evaluate long term changes in the ratio of UV to X-ray intensities for all jet knots.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
12:30:49.00	+12:23:30.00	M87	ACIS-S	NONE	10

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700091

Title: Jet-driven outflows in radio galaxies

Type: GO Total Time (ks): 140

PI Name: Martin Hardcastle

Extended optical emission-line regions (EELR) in radio galaxies (RG) are often found to be driven by strong interactions between the jet and the cold IGM; the mass in cold gas in these outflows is relatively small. We have recently found extended X-ray emission coincident with the EELR in two nearby RG, and, ruling out photoionization on energetic and morphological grounds, have shown that all the data are consistent with the X-rays being from a massive outflow of thermal gas in which the cold EELR material is embedded. Combining optical lines and X-rays, we can measure both the mass and the dynamics of the outflows. We wish to test our model by observing a small sample of well-studied RG with EELR, thereby constraining the outflow energetics and its scaling with jet/AGN power.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
23:16:35.20	+04:05:18.20	3C459	ACIS-S	NONE	62
22:53:03.20	-40:57:46.20	PKS 2250-41	ACIS-S	NONE	8

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700111

Title: Continuing the Chandra 3CR Snapshot Survey: 23 Radio Sources with 0.5
Type: GO Total Time (ks): 276

PI Name: Francesco Massaro

In the past decade many 3CR sources have been observed by Chandra and in particular, during AO9, AO12 and AO13, a Chandra snapshot survey has been successfully carried out for all the unobserved 3CR sources with z<0.5. The results confirm our expectations and this proposal requests to extend these X-ray observations of unobserved 3CR sources at higher redshift, to complete the whole 3CR sample. The proposed observations will yield detections of new jets, hotspots, nuclei and galaxy clusters as occurred in our previous low redshift sources. This Chandra data set will also provide a versatile, complete, and uniform database that will be a valuable resource for the astronomical community and since it is designed as a `legacy' program, we waive proprietary rights.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
01:10:18.70	+31:47:20.40	3C34	ACIS-S	NONE	12
01:26:44.40	+33:13:11.20	3C41	ACIS-S	NONE	12
01:31:21.80	+06:23:40.80	3C44	ACIS-S	NONE	12
01:55:30.20	+43:45:55.40	3C54	ACIS-S	NONE	12
01:57:10.50	+28:51:37.50	3C55	ACIS-S	NONE	12
03:43:30.00	+04:57:48.50	3C93	ACIS-S	NONE	12
05:31:29.40	+06:30:24.90	3C142.1	ACIS-S	NONE	12
06:13:50.10	+26:04:36.70	3C154	ACIS-S	NONE	12
06:51:15.30	+45:09:26.20	3C169.1	ACIS-S	NONE	12
09:08:50.60	+37:48:19.20	3C217	ACIS-S	NONE	12
09:42:15.40	+13:45:50.50	3C225B	ACIS-S	NONE	12
10:07:60.00	+07:30:16.30	3C237	ACIS-S	NONE	12
10:58:58.80	+43:01:23.10	3C247	ACIS-S	NONE	12
12:24:28.50	+42:06:36.30	3C272	ACIS-S	NONE	12
12:51:43.60	+50:34:24.90	3C277	ACIS-S	NONE	12
12:53:33.00	+15:42:29.20	3C277.2	ACIS-S	NONE	12
13:42:13.30	+60:21:42.80	3C288.1	ACIS-S	NONE	12
13:50:42.00	+64:29:30.60	3C292	ACIS-S	NONE	12
13:54:41.00	+16:14:50.10	3C293.1	ACIS-S	NONE	12
15:41:45.50	+60:15:35.00	3C323	ACIS-S	NONE	12
04:12:22.60	-00:59:32.40	3C107	ACIS-S	NONE	12
04:20:22.20	+17:53:55.20	3C114	ACIS-S	NONE	12

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700182

Title: AGN-Triggered Star Formation in the Dwarf Galaxy Henize 2-10?

Type: GO Total Time (ks): 200

PI Name: Amy Reines

We have identified a low-luminosity AGN at the center of the dwarf starburst galaxy Henize 2-10 (Reines et al. 2011). This unique galaxy offers the first opportunity to study the interplay between black hole growth and star formation in physical conditions similar to those expected in the early Universe. Existing multi-wavelength observations are suggestive of AGN-triggered star formation in the central region of the galaxy, but definitive evidence is lacking. Our proposal aims to test this positive AGN-feedback hypothesis using deep Chandra imaging to study the morphology and spectral properties of X-ray emitting structures in the galaxy, including a tentatively detected jet and bow-shock.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
08:36:15.10	-26:24:34.10	He 2-10	ACIS-S	NONE	200

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700192

Title: Deep Chandra Imaging of Two Youngest Radio Sources

Type: GO Total Time (ks): 85

PI Name: Aneta Siemiginowska

We propose imaging studies with Chandra of two young radio sources with measured kinematic ages < 300 years. Our main goals are to establish their X-ray properties, determine the origin of the X-ray emission, study properties of their nucleus and environment. These young radio sources are in an important phase of a highly supersonic expansion and drive strong shocks into external medium. Such interactions are critical for 'feedback' that is not yet understood. The new X-ray data will allow to investigate the dynamics of such interactions in the youngest radio sources which are impacting directly the nuclear regions of their host galaxies.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
17:23:41.00	-65:00:36.60	PKS 1718-649	ACIS-S	NONE	50
14:07:00.30	+28:27:14.00	OQ280	ACIS-S	NONE	35

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700338

Title: PRE-SELECTING DUAL AGN CANDIDATES USING WISE: A CHANDRA PILOT STUDY

Type: GO Total Time (ks): 152

PI Name: Shobita Satyapal

Despite decades of searching, observationally confirmed cases of binary AGNs are extremely rare, and most have been discovered serendipitously. Using the all-sky WISE survey, we identified a population of ~100 strongly interacting galaxies that display extreme red mid-IR colors thus far exclusively associated in extragalactic sources with powerful AGNs. These galaxies are optically quiescent suggesting that they capture a population of binary AGNs that cannot be found through optical studies.We propose to observe with Chandra the 10 brightest dual AGN candidates with nuclear pair separations < 10 kpc. The exquisite spatial resolution and sensitivity of Chandra are required to confirm the presence of dual AGNs in these targets and constrain their properties.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
10:36:31.90	+02:21:43.90	SDSSJ1036+0221	ACIS-S	NONE	3
01:22:18.10	+01:00:25.90	SDSSJ0122+0100	ACIS-S	NONE	5
10:45:18.00	+35:19:13.10	SDSSJ1045+3519	ACIS-S	NONE	5
11:26:19.40	+19:13:29.60	SDSSJ1126+1913	ACIS-S	NONE	15
13:06:53.60	+07:35:18.20	SDSSJ1306+0735	ACIS-S	NONE	16
12:21:05.00	+11:37:52.30	SDSS2210+1137	ACIS-S	NONE	4

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700344

Title: Chandra imaging of the bright Compton-thick Seyfert galaxy ESO 138-G1

Type: GO Total Time (ks): 50

PI Name: Enrico Piconcelli

We propose to perform the first Chandra observation of the bright Compton-thick Seyfert galaxy ESO 138-G1. Such a Chandra observation is timely and relevant: its combination with recent XMM-Newton deep spectroscopy will enable us to study, in unprecedented detail, the morphology and the origin of the X-ray emission from this nearby galaxy (1 arsec = 180 pc), which shows unambiguous evidence of extended (possibly AGN-driven) component in the optical/UV band.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
16:51:20.10	-59:14:04.20	ESO138-G1	ACIS-S	NONE	50

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700355

Title: Probing the circumnuclear region of NGC 7582

Type: GO Total Time (ks): 200

PI Name: Valentina Braito

NGC7582 is a bright and nearby Seyfert 2 and a prototype for the presence of multiple absorbers and emitters. Its X-ray variability implies the presence of an absorber located at the distance of the BLR. The X-ray spectrum is rich in emission lines suggesting the presence of photoionized emitters. We propose to map these circumnuclear emitting/absorbing regions through a deep grating observation with the Chandra-HETG. The main goals of the proposal are: (a) use the unique high spectral resolution to resolve for the first time the Fe K emission line profile and therefore the location of the material, by measuring with high precision its centroid energy, FWHM and flux, (b) use the high spectral and spatial resolution of the HETG detectors to map the circum-nuclear photoionized emitters.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
23:18:23.50	-42:22:14.00	NGC 7582	ACIS-S	HETG	200

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700378

Title: Probing dark matter in the luminous radio galaxy 3C220.3 and the structure of the z=2.22 SMG/AGN it is lensing.

Type: GO Total Time (ks): 200

PI Name: Belinda Wilkes

The radio galaxy 3C 220.3 (z=0.685) is lensing a submm galaxy (SMG) at z=2.221 housing an AGN. This unique system allows accurate estimates of both stellar and dark mass in the luminous radio galaxy. In addition, the lensing magnification of 7 offers an unprecedented view of the interaction between star formation and AGN feedback in a luminous, dusty galaxy at the peak epoch of cosmic star formation. Our previous 10ks Chandra observation shows X-ray emission throughout the system, including the SMG, but with too few counts to identify the origin(s). We propose deeper Chandra and HST observations to (1) locate the X-ray sources, measure the X-ray properties and independently estimate the bolometric luminosities of both AGN (2) better map the offset between the SMG's UV and dust emission.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
09:39:23.40	+83:15:26.10	3C 220.3	ACIS-S	NONE	200

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700397

Title: Unifying X-ray winds in radio galaxies with Chandra HETG

Type: LP Total Time (ks): 500

PI Name: Francesco Tombesi

X-ray winds are routinely observed in the spectra of Seyfert galaxies. They can be classified as warm absorbers (WAs), with v~100-1,000km/s, and ultra-fast outflows (UFOs), with v>10,000km/s. In stark contrast, the lack of sensitive enough observations allowed the detection of WAs or UFOs only in very few radio galaxies. Therefore, we propose to observe a small sample of three radio galaxies with the Chandra HETG - 3C111 for 150ks, 3C390.3 for 150ks and 3C120 for 200ks - to detect and study in detail their WAs. We will quantify the importance of mechanical feedback from winds in radio galaxies and compare them to the radio jet power. We will also test whether WAs and UFOs can be unified in a single, multi-phase and multi-scale outflow, as recently reported for Seyferts.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
04:18:21.30	+38:01:35.80	3C 111	ACIS-S	HETG	150
18:42:09.00	+79:46:17.10	3C 390.3	ACIS-S	HETG	150
04:33:11.10	+05:21:15.60	3C 120	ACIS-S	HETG	200

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700418

Title: Testing relativistic feedback at crucial jet power

Type: GO Total Time (ks): 190

PI Name: Diana Worrall

PKS B2152-699 offers an exceptional opportunity to resolve long-standing questions about the physics of energy transfer in jet flows. It displays very well-defined offsets between the X-ray, optical and radio centroids of one of its hotspots, from which we can test whether the jet flow remains relativistic for about 150 kpc, and identify the particle acceleration and energy-loss processes involved. It also shows strong jet deflections closer to the AGN, apparently associated with highly-ionized gas clouds, where measurements of the X-ray temperature will tell us about energy transfers to the clouds. Both tests require an additional 190 ks of ACIS-S data to combine with the existing data.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
21:57:07.40	-69:41:16.50	PKS B2152-699-HIC	ACIS-S	NONE	190

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700425

Title: Exploring the X-ray - TeV connection in BL Lacs on short timescales

Type: TOO Total Time (ks): 30

PI Name: Sarah Kaufmann

We propose to perform one ToO for a full night (30 ks) of simultaneous observation with Chandra and H.E.S.S., on a flaring TeV blazar with flux high enough to constrain both spectra on hour timescales or less. Our goal is to investigate with unprecedented detail the intra-night and sub-hour variability in TeV blazars, as strikingly revealed by H.E.S.S. observations on PKS 2155-304 (few minutes flux doubling timescales). The aim is to shed light on the origin of the gamma-ray emission and on the relation between X-ray and gamma-ray emissions.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
		flaring TeV BLLac	ACIS-S	NONE	30

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700482

Title: The mystery of NGC 1377 -- AGN feedback in a low mass galaxy?

Type: GO Total Time (ks): 50

PI Name: Anne Lohfink

Active galactic nuclei (AGN) influence their surroundings via feedback processes and contribute significantly to the evolution of their host galaxies. While this is well established today, AGN feedback has only been observed in high mass galaxies. This raises the question whether AGN feedback is genuinely absent in low mass galaxies. Understanding the feedback processes operating in these galaxies is in particular crucial as AGN feedback would have a much higher impact on their evolution. We therefore propose to observe NGC 1377, a rare low mass galaxy showing indications for AGN activity and feedback, for 50 ks. If confirmed, this object will be ideal to further constrain the existing galaxy evolution and AGN feedback models.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
03:36:39.10	-20:54:08.10	NGC 1377	ACIS-S	NONE	50

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700485

Title: Probing black hole accretion in binary quasars at high redshifts

Type: GO Total Time (ks): 140

PI Name: Cristian Vignali

We propose to observe two optically selected broad-line quasar pairs at z=3.0-3.3 with separations <70 kpc. These QSOs, with BH masses larger than 10^9 Msun, are likely associated to the most massive peaks of the primordial dark matter halos. The main goal of this project is (i) to characterize, for the first time, the X-ray properties of AGN pairs at high redshifts and (ii) check whether imprints or hints for interactions are present in X-rays, as expected by models of galaxy mergers even on the scales probed by these quasar pairs. Indications of outflowing material (broad absorption lines) are present in the optical spectra of two quasars. This project is optimally suited for Chandra because of the close separation of our pairs (5.8-8.2 arcsec).

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
13:07:56.70	+04:22:15.60	SDSSJ130756.73+042215.57	ACIS-S	NONE	70
16:22:10.10	+07:02:15.30	SDSSJ162210.11+070215.34	ACIS-S	NONE	70

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700502

Title: Resolved Spectroscopy of the Extended X-ray Emission in NGC 4151: New Insights into AGN-driven Outflows

Type: GO Total Time (ks): 250

PI Name: Steven Kraemer

AGN feedback, in the form of winds or jets, is likely the mechanism that connects the growth of galactic bulges and their super-massive black holes. AGN-driven winds are most directly studied at the spatial scale of the narrow line region (NLR), but little is known of NLR X-ray emitting gas, which may be the dominant component in mass outflows. Given its brightness and orientation, the Seyfert 1 galaxy NGC 4151 is one of the few AGN for which we can resolve the X-ray NLR. We will obtain a 250 ksec Chandra/HETG observation, at a roll angle which will permit us to map the kinematics and ionization structure of the high-ionization gas. We will use these data to determine the mass outflow rate and kinetic luminosity of the X-ray gas, and, thus, its role in AGN feedback.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
12:10:32.60	+39:24:21.00	NGC4151	ACIS-S	HETG	250

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700509

Title: LATE TIME MONITORING OF THE EXCEPTIONAL TIDAL DISRUPTION EVENT SWIFT J1644+57

Type: GO Total Time (ks): 50

PI Name: Andrew Levan

The discovery of a population of relativistic tidal disruption events has opened a new window; viewing accretion around massive black holes from start to finish on short timescales, and offering a new route to probing the ubiquity of black holes in galaxies. Here we propose continued follow-up of the first, and by far best studied of the events - Swift J1644+57. Observing after the rapid switch off of the jet we will understand if the ongoing X-ray emission is due to the tidal flare itself, or if there is a faint underlying AGN. In turn, we will study the nature of the accretion and gain insights into what may have made Swift J1644+57 produce a jet. In concert with approved observations with HST and Spitzer this will create a dataset with legacy value on this rosetta stone object.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
16:44:49.90	+57:35:00.20	Swift J1644+57	ACIS-S	NONE	50

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700510

Title: THE NUCLEAR FE- K SOURCES OF THE MERGER ULIRG ARP220

Type: GO Total Time (ks): 250

PI Name: Giuseppina Fabbiano

We propose an in-depth investigation of the nuclei of Arp220, the nearest ULIRG, to constrain the relative contribution of AGN emission and strong shocks to the Fe-K band, where the nuclei are detected in sub-pixel images of the archival Chandra data. The proposed observations are key to firmly establishing the presence of a dual Compton Thick AGN. We will also re-examine the diffuse large-scale soft emission of Arp220, and investigate if the inner luminous plumes are AGN-powered. Their conical shape is suggestively similar to that of the ionization cones of Seyfert nuclei we have studied with Chandra (e.g. Mkn573).

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
15:34:57.10	+23:30:11.00	Arp220	ACIS-S	NONE	250

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700519

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

Type: TOO Total Time (ks): 280

PI Name: Gabriele Ponti

In the event that the Galactic Centre super-massive black hole, SgrA*, goes into outburst (LSgrA*>=10^36$ erg S-1) during Cycle-15 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 black hole 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

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700542

Title: A Chandra Study of Nearby Hybrid Morphology Radio Source

Type: GO Total Time (ks): 36

PI Name: Dharam Lal

It has been suggested that the unusual morphology of `hybrid morphology radio sources', or HyMors, strongly constrains the theoretical mechanisms proposed for the Fanaroff-Riley (FR) morphological dichotomy. Here, we propose a Chandra study of a nearby HyMors, MRC0131-367, and request 36 ks Chandra time to test the hypothesis that external environmental factors influence the jet structure by carrying out a systematic investigation of its hot-gas environment. Our observations will help to answer the questions (i) `what causes the differences between FR-I and FR-II radio structures?', and (ii) `what role does the environment play in the relationship between these two?'

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
01:33:57.70	-36:29:36.00	MRC0131-367	ACIS-S	NONE	36

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700554

Title: Studying AGN evolution with ionization echoes

Type: GO Total Time (ks): 190

PI Name: Mischa Schirmer

"Green beans" are rare type-2 quasars with ultra-luminous extended emission line regions. Their [OIII] luminosities are amongst the highest known, 5-50 times higher than expected from nuclear mid-IR luminosity. This can only be explained by ionization echoes, i.e. the AGN have recently started shutting down. Ionization echoes reveal large changes in AGN activity, indicating that our understanding of SMBH accretion is incomplete. With Chandra we can detect even deeply buried AGN, confirm the ionization echoes, and learn about how GBs formed. As the echoes retain a memory of the AGN luminosity over the last 100,000 years, we can reconstruct similarly long AGN light curves, complementary to other variability studies. Therefore GBs offer a unique insight into SMBH growth.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
00:20:16.40	-05:31:26.00	J002016.4-053126	ACIS-S	NONE	30
00:24:34.90	+32:58:42.00	J002434.9+325842	ACIS-S	NONE	20
14:55:33.60	+04:46:43.00	J145533.6+044643	ACIS-S	NONE	20
15:05:17.60	+19:44:44.00	J150517.6+194444	ACIS-S	NONE	15
22:40:24.10	-09:27:48.00	J224024.1-092748	ACIS-S	NONE	15
20:50:58.00	+05:50:12.00	J205058.0+055012	ACIS-S	NONE	15
01:59:30.80	+27:03:02.00	J015930.8+270302	ACIS-S	NONE	30
14:41:10.90	+25:17:00.00	J144110.9+251700	ACIS-S	NONE	30
01:13:41.10	+01:06:08.00	J011341.1+010608	ACIS-S	NONE	15

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700595

Title: The curious case of Mrk~590

Type: GO Total Time (ks): 100

PI Name: Smita Mathur

Mrk 590 is presently in an unusual state. Its soft-excess has disappeared, its broad emission lines have disappeared, and it shows the presence of a relativistic outflow. All these observations could be related to each other and perhaps the underlying cause is a low accretion rate relative to Eddington. Our proposed observations with Chandra and HST will not only help to understand the curious case of Mrk 590, but also to answer some long-standing questions in AGN physics: What is the origin of the soft-excess?; What is the origin of the broad emission line region?; What is the launching mechanism of outflows? Mrk 590 provides us with an unique opportunity to find the underlying physics related to these apparently disparate phenomena.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
02:14:33.60	-00:46:00.30	Mrk590	ACIS-S	HETG	70

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700675

Title: The Ultrafast Outflow of the Lensed z=1.51 AGN HS 0810+2554

Type: GO Total Time (ks): 100

PI Name: George Chartas

Massive and ultrafast wide-angled outflows from AGN are one of the proposed feedback mechanisms that may provide the coupling of kinetic energy between quasars and their host galaxies. To further our understanding of the AGN's role in this process we propose joint Chandra and XMM observations of the outflow of the z=1.5 AGN HS 0810+2554. The factor of 120 lensing magnification of HS0810 makes this source exceptionally bright compared to other quasars with detected outflows at similar distances. We will also study the short and long-term variability of the X-ray outflow and the correlation of X-ray wind properties to the X-ray and UV spectral properties. The variability and correlation results will provide insight into the acceleration mechanism of the wind.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
08:13:31.30	+25:45:03.00	HS 0810+2554	ACIS-S	NONE	100

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 15700719

Title: A Pilot Search for Spatially Offset AGN in Galaxy Merger Remnants

Type: GO Total Time (ks): 155

PI Name: Julia Comerford

We request Chandra/ACIS-S observations (155 ks total) and HST imaging (10 orbits total) for a pilot study of 10 galaxies whose AGN emission lines are offset in velocity from systemic. These are candidates for offset AGN, which occur when one of the two supermassive black holes in a galaxy merger is active. We have carefully constructed our sample to remove cases where gas kinematics produce the velocity offsets, but Chandra and HST observations are necessary to confirm offset AGN as the AGN that are spatially offset from the primary galaxy centers. With the observations proposed here, we will carry out the first systematic search for offset AGN. We will use the results of this search to study the circumstances for triggering offset AGN, and to inform future searches for offset AGN.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
13:46:40.80	+52:28:36.60	SDSS J134640.79+522836.6	ACIS-S	NONE	10
01:32:58.90	-10:27:07.00	SDSS J013258.92-102707.0	ACIS-S	NONE	15
08:39:03.00	+47:07:56.30	SDSS J083902.97+470756.3	ACIS-S	NONE	10
13:54:29.10	+13:27:57.20	SDSS J135429.05+132757.2	ACIS-S	NONE	10
10:55:53.60	+15:20:27.40	SDSS J105553.64+152027.4	ACIS-S	NONE	15
10:31:48.90	+01:07:22.60	SDSS J103148.90+010722.6	ACIS-S	NONE	20
16:30:07.60	+21:50:47.70	SDSS J163007.63+215047.7	ACIS-S	NONE	10
09:26:35.10	-00:26:03.60	SDSS J092635.14-002603.6	ACIS-S	NONE	15

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 15800006

Title: RXJ1324.7-5736: one of the closest and brightest cool core clusters

Type: GO Total Time (ks): 48

PI Name: Ming Sun

Discovery of X-ray cavities and shocks related to the outbursts of the central AGN has been one of Chandra's legacies. These features serve as calorimeters for the total energy outputs of the AGN, allowing important constraints on the evolution of SMBHs. Chandra is ideal for X-ray bright cool cores, especially nearby ones hosting strong radio AGN. While it is natural to believe that all the X-ray brightest, nearby cool cores have been observed by Chandra at this stage, we found that one of the brightest cool core clusters, in fact the 6th brightest one in terms of the intrinsic flux, has not been observed by Chandra. It also hosts a strong central radio AGN. We request a 48 ks observation for this interesting system to search for substructures related to AGN heating.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
13:24:46.50	-57:36:31.80	RXJ1324.7-5736	ACIS-S	NONE	48

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 15800201

Title: Imaging spectroscopy of the Remarkable Halo of 4C+37.11

Type: GO Total Time (ks): 100

PI Name: Roger Romani

4C+37.11 is a unique source with two active nuclei (resolved by VLBI at 7pc separation) in a luminous elliptical surrounded by a bright X-ray halo; this is a likely fossil cluster. We see remarkable X-ray structure: arcsecond-scale cavities apparently associated with the AGN outflows and arcmin-scale features in the X-ray halo that may be cold fronts or shocks associated with recent merger activity. We propose an ACIS exposure that will allow a spectroscopic study of these features and a characterization of the temperature, density, pressure and entropy profiles of the intergalactic medium surrounding the bright central galaxy. These data will give important insight into the history of this as yet unmerged SuperMassive Binary Black Hole and its feedback on the X-ray halo.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
04:05:49.20	+38:03:32.00	4C+37.11	ACIS-I	NONE	100

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 15800314

Title: The Massive Fossil Cluster RXJ1416.4+2315

Type: GO Total Time (ks): 100

PI Name: David Buote

Our preliminary analysis of AO7 Suzaku data and a shallow Chandra observation of the fossil cluster RXJ 1416.4+2315 does not find evidence for the gas clumping invoked to explain the flat entropy profiles found near r_vir in several nearby clusters. Instead its ICM properties at r_vir are consistent with adiabatic cluster formation as we found previously for the fossil group/cluster RXJ 1159+5531, which may reflect that hydrostatic equilibrium is very accurate in these highly evolved fossil systems. We propose (1) snapshot offset Chandra ACIS-I observations to resolve the brightest discrete sources to better characterize the CXB, and (2) a deeper Chandra central pointing to provide key leverage at smaller radii to better constrain the mass, baryon, and entropy profiles interior to r_vir.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
14:16:21.60	+23:05:25.90	RXJ1416.4+2315 Offset 2	ACIS-I	NONE	5
14:16:37.00	+23:25:22.10	RXJ1416.4+2315 Offset 3	ACIS-I	NONE	5
14:15:50.90	+23:21:48.70	RXJ1416.4+2315 Offset 4	ACIS-I	NONE	5
14:16:26.00	+23:15:23.00	RXJ1416.4+2315 Center	ACIS-I	NONE	80
14:15:47.00	+23:10:38.80	RXJ1416.4+2315 Offset 1	ACIS-I	NONE	5

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 15800323

Title: Probing with X-ray the mass distribution in the lensing cluster A1703

Type: GO Total Time (ks): 51

PI Name: Fabio Gastaldello

We propose a 51 ks observation of the lensing, X-ray luminous cluster A1703 to constrain its total and hot gas mass profile. A1703 is an exceptional target from the strong lensing point of view because there are multiple strong lens systems for a wide range of source redshifts constraining the enclosing mass at different radii. It is also unusually relaxed providing a special opportunity to study its mass profile by applying hydrostatic equilibrium. Given the still debated issue of very high concentrations found for some massive lensing clusters, by obtaining high quality X-ray data for a well relaxed cluster we will perform a key test for the Lambda CDM structure formation scenario.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
13:15:00.70	+51:49:10.00	Abell 1703	ACIS-I	NONE	51

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 15800332

Title: SNAPSHOTS IN THE HISTORY OF DISSOCIATIVE MAJOR MERGERS

Type: GO Total Time (ks): 205

PI Name: Florian Pacaud

We propose joint Chandra/HST observations of two z=0.3 cluster mergers presenting offsets between the gas and dark matter distribution. Both were discovered within the follow-up program of the APEX-SZ experiment. The first one shows a bullet structure with a probable bow shock. The new data will permit an accurate joint X-ray, Sunyaev-Zel'dovich effect and lensing analysis to characterize both the thermodynamical state of its intracluster gas and the distribution of dark matter around it. The second cluster lacks good X-ray data and we request a short Chandra observations to confirm the gas distribution. Combined with three similar systems from the APEX-SZ sample, we aim at reconstructing obsevationally the time sequence of dissociative mergers.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
02:45:27.70	-53:02:10.00	Abell S0295	ACIS-I	NONE	180
11:35:36.80	-20:19:42.00	RXC J1135.6-2019	ACIS-I	NONE	25

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 15800369

Title: Abell 2256: New paradigms for thermal/relativistic interactions?

Type: GO Total Time (ks): 180

PI Name: LAWRENCE RUDNICK

The classic picture of merger-driven shocks creating cluster peripheral radio re lics is in trouble. Abell 2256 presents unique challenges to shock-driven models, exacerbating issues in the recent literature. It also provides the only opportunity to probe instabilities in the shock plane, because of the orientation of its spectacular filamentary relic. We have identified a possible thermal shock associated with the relic, but the canonical bright radio edge is missing. We have also found a unique structure where a tailed radio galaxy has apparently punched through a cold front. For a variety of fundamental cluster physics questions related to the interaction of thermal and relativistic plasmas, Abell 2256, with this proposed set of deep Chandra observations, alone holds the key.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
17:02:42.50	+78:42:03.70	Abell 2256	ACIS-I	NONE	180

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 15800442

Title: Powerful radio galaxies in rich clusters

Type: GO Total Time (ks): 180

PI Name: Martin Hardcastle

High-power, `classical double' radio galaxies in cluster environments are rare at low z and so poorly studied, but they are of interest because their dynamics are relatively well understood and can be modeled in detail; they may provide significant energy/entropy input to clusters over the lifetime of the Universe. We have selected two bright clusters from a snapshot survey of the low-redshift 3C radio galaxies; both show evidence for strong RG/cluster interactions. We propose to observe these for long enough to test shock models (including the results of numerical modeling) and establish the energetic input to the cluster by the radio galaxies. Combined with existing data, this will give us the basis of a relationship between radio power and cluster energy input via shocks.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
15:31:25.40	+35:33:40.20	3C320	ACIS-S	NONE	110

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 15800474

Title: Deep imaging and spectroscopy of the Centaurus cluster: metals and filaments

Type: LP Total Time (ks): 500

PI Name: Jeremy Sanders

The Centaurus cluster is nearby, bright and has a metallicity three times that of other nearby clusters. It is one of the best targets in which to study ICM metal physics. We will probe metallicity structure to sub-kpc scales, matching AGN feedback scales. The central drop in metallicity implies metals are locked in dust associated with filaments. We will examine Ar/Ne which are not, testing this hypothesis. The spectrum of metallicity fluctuations will probe diffusion and turbulence. Additional science goals will be to examine Type Ia/II enrichement, the pressure variations caused by radio bubbles to study feedback, the magnetic field structure and the soft X-ray connection to the optical filaments.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
12:48:48.90	-41:18:43.80	Centaurus cluster	ACIS-S	NONE	500

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 15800532

Title: TO THE VIRIAL RADIUS OF THE MOST LUMINOUS LOCAL GALAXY GROUP: UGC03957

Type: GO Total Time (ks): 40

PI Name: Lorenzo Lovisari

Detailed and extended measurements out to large radii have the potential of improving our understanding of the cluster growth, structure, mass and metal enrichment of massive bound systems. While the physical properties of the outskirts of massive clusters have been already obtained for a handful of objects, the region near the virial radius remain relatively unexplored in case of galaxy groups. We propose 4 Chandra snapshots to detect all the bright point sources in the outskirt of the most luminous local galaxy group UGC 03957 to obtain a careful estimation of the cosmic X-ray background component and determine the physical properties (temperature, metallicity and mass profiles) with our 270 ksec Suzaku observations, limited only by the statistical uncertainty.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
07:39:42.30	+55:48:46.80	UGC 03957 NORTH	ACIS-I	NONE	10
07:43:53.40	+55:30:33.80	UGC 03957 EAST	ACIS-I	NONE	10
07:42:05.80	+55:02:42.70	UGC 03957 SOUTH	ACIS-I	NONE	10
07:38:14.40	+55:15:17.60	UGC 03957 WEST	ACIS-I	NONE	10

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 15800543

Title: Searching for Signatures of Episodic AGN Feedback in the Core of the Phoenix Cluster

Type: GO Total Time (ks): 59.1

PI Name: Michael McDonald

In the core of the Phoenix cluster (SPT-CLJ2344-4243) is the strongest cooling flow on record, with a classical cooling rate of ~2700 Msun/yr. In contrast to low redshift "cool core clusters", which are converting only ~5% of the predicted cooling into stars, this cluster is experiencing an 800 Msun/yr starburst in the central, most-massive galaxy, corresponding to ~30% of the predicted cooling flow. This unique system begs the question: Why isn't AGN feedback preventing star formation? In order to address this outstanding question, we propose a combined GO+GTO program to search for cavities/bubbles in a deep X-ray image of the Phoenix cluster, allowing us to quantify the balance, or lack thereof, between cooling and feedback, providing a potential explanation for this exotic system.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
23:44:42.00	-42:42:52.60	SPT-CLJ2344-4243	ACIS-I	NONE	59.1

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 15800582

Title: Did Precessing Jets and/or a Merger Make a Diamond in Abell 2626?

Type: GO Total Time (ks): 120

PI Name: Craig Sarazin

The cool core cluster A2626 has an amazing radio source. The cD IC5338 has 2 nuclei 3" apart. Radio/X-ray jets from the SW nucleus lead to 2 narrow N and S radio arcs; these fit the working surfaces of a pair of precessing jets. Recent radio data also show a W arc, and an E edge. We suggest these are due to another pair of precessing jets from the NE nucleus. The S0 galaxy IC5337 is merging from the west; the W arc might also be a radio relic due to a merger shock. Our proposed observation will search for a second pair of precessing jets, an X-ray AGN in the NE nucleus, and the interaction of the jets and arcs with the X-ray gas. We will detect a merger shock associated with the W arc and S0 galaxy, if present. A2626 provides a unique test of precessing jets and merging SMBHs.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
23:36:30.50	+21:08:45.50	Abell 2626	ACIS-S	NONE	120

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 15800614

Title: Unmasking Galaxy Clusters Masquerading As Quasars

Type: GO Total Time (ks): 90

PI Name: Megan Donahue

We propose to observe 5 of 25 galaxy clusters associated with RASS Bright Sources. 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 ROSAT point sources. Understanding objects like these and their underrepresentation in previous X-ray cluster surveys is important for precision cluster cosmology, 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)
10:30:35.20	+51:32:32.10	RXJ103035.2+513229	ACIS-I	NONE	20
08:54:50.60	+62:18:50.00	RXJ085451.0+621843	ACIS-I	NONE	18
11:19:08.90	+09:00:22.80	RXJ111908.5+090017	ACIS-I	NONE	22
14:56:10.90	+30:21:06.30	RXJ145611.1+302108	ACIS-I	NONE	20
09:05:33.50	+18:40:02.60	RXJ090533.4+184011	ACIS-I	NONE	10

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 15800657

Title: Chandra Observations of a Complete Sample of SZE Clusters from ACT

Type: LP Total Time (ks): 498

PI Name: John Hughes

We propose to continue our program with Chandra to observe a complete sample of galaxy clusters detected by the Atacama Cosmology Telescope using the Sunyaev-Zeldovich effect (SZE). The proposed ACIS-I observations of 10 massive, newly-discovered SZE clusters will provide a precision calibration of the SZE signal versus mass scaling law out to redshifts of 1. This effort is part of an intensive multi-wavelength campaign to produce an unbiased, well-observed sample of massive galaxy clusters out to high redshifts for cosmological investigations.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
00:22:13.00	-00:36:33.80	ACT-CL J0022-0036	ACIS-I	NONE	72
00:59:08.50	-00:50:05.80	ACT-CL_J0059-0049	ACIS-I	NONE	40
00:14:54.10	-00:57:08.50	ACT-CL_J0014-0056	ACIS-I	NONE	30
02:06:13.40	-01:14:17.00	ACT-CL_J0206-0114	ACIS-I	NONE	30
21:54:32.40	-00:49:00.40	ACT-CL_J2154-0049	ACIS-I	NONE	65

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 15800664

Title: A deep study of ram-pressure stripping, metal ridges, and AGN feedback in the Ophiuchus Cluster

Type: GO Total Time (ks): 250

PI Name: Steven Allen

We propose a 250 ks ACIS-I observation of the inner regions of the Ophiuchus Cluster. The existing 50 ks Chandra observation has already provided remarkable insights into the effects of ram pressure on a cool core in motion within a rich cluster. Using a combination of new X-ray and radio data, we will explore this system in unprecedented detail, studying the thermodynamics and multiphase structure within the surviving cool core. At the outer boundary of the core, we will search for the development of shearing instabilities and the onset of mixing. Beyond the core, we will study the large, coherent ridges of enhanced metallicity, their origins, and relation to past activity of the central AGN. At yet larger radii, we will probe in detail for the first time the structure of the ambient ICM.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
17:12:27.70	-23:22:07.00	Ophiuchus Cluster	ACIS-I	NONE	250

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 15800706

Title: Hydrodynamics of merging and stripping in the Fornax Cluster: A Deep Chandra observation of NGC 1404

Type: LP Total Time (ks): 500

PI Name: Ralph Kraft

Early-type galaxies falling into clusters provide an excellent probe for ICM properties as they are stripped due to their motion through the cluster gas. They form a tail of gas attached to the remnant merger core (RMC). Both the upstream and side edge of the RMC and the tail are sites where the cool galaxy gas and the hot ambient ICM could mix, unless prevented by ICM viscosity or magnetic fields. The RMC of NGC 1404 in the Fornax cluster is the best target to observe the absence or presence of this mixing. We propose 500 ks Chandra/ACIS-S observations of NGC 1404 to make a direct measurement of gas mixing and viscosity in the ICM with a sensitivity that cannot be reached in any other target. We support the interpretation of our data by specifically tailored hydro simulations.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
03:38:51.90	-35:35:40.00	NGC 1404	ACIS-S	NONE	400
03:39:16.40	-35:39:40.20	NGC 1404 tail	ACIS-S	NONE	100

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 15800803

Title: Setting the Scale: Supporting precision cluster cosmology with Chandra observations of low-z lensing clusters

Type: GO Total Time (ks): 65

PI Name: Adam Mantz

The most critical systematic uncertainty now facing galaxy cluster cosmology is in the overall calibration of cluster masses. A large cluster sample having both gravitational lensing and X-ray data can provide an unbiased calibration for X-ray mass proxies, which can then be applied to clusters which lack lensing data, effectively overcoming this obstacle. We propose Chandra observations of 12 clusters at low redshift to complete the X-ray coverage of a sample of 130 ROSAT clusters which have lensing data. An associated archival project seeks to exploit the full sample; together, they will provide a percent-level constraint on the mass calibration, enabling constraints of unprecedented precision from clusters.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
09:12:29.80	+15:56:34.80	A763	ACIS-I	NONE	5
14:31:03.60	+25:37:40.80	A1927	ACIS-I	NONE	5
15:20:53.00	+48:40:19.20	A2064	ACIS-I	NONE	5
10:16:20.40	+33:38:27.60	A961	ACIS-I	NONE	5
08:28:04.60	+44:45:50.40	A667	ACIS-I	NONE	5
01:32:40.90	-08:04:20.00	RXJ0132.6-0804	ACIS-I	NONE	6
14:21:42.70	+37:17:56.40	A1902	ACIS-I	NONE	5
10:50:35.50	-02:36:00.00	RXJ1050.5-0236	ACIS-I	NONE	6
05:30:38.40	-22:26:53.90	RXJ0530.6-2226	ACIS-I	NONE	5
01:06:52.40	-02:29:24.00	RXJ0106.8-0229	ACIS-I	NONE	7
20:43:12.50	-21:44:06.00	RXJ2043.2-2144	ACIS-I	NONE	6
05:07:45.70	-09:15:16.00	RXJ0507.7-0915	ACIS-I	NONE	5

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 15800858

Title: Clusters, Galaxies, and AGN in HST Frontier Fields

Type: LP Total Time (ks): 520

PI Name: Christine Jones

We propose deep Chandra ACIS-I observations for three HST Frontier Field clusters to obtain 80k source counts for each cluster. The Frontier cluster A2744 already has 80k counts. We also propose JVLA observations for two Frontier clusters and have approved JVLA observations for a third. We will combine the HST cluster lensing mass maps with deep Chandra, HST, and Spitzer imaging, radio and SZ maps, extensive optical spectroscopy, and numerical simulations to understand the physics of the mergers, the transformations of cluster galaxies, and the generation of radio halos and relics in all four HST Frontier clusters that will be observed in HST Cycles 21/22. The combination of Chandra and HST imaging in the parallel fields will test if galaxy mergers play a dominant role in triggering AGN.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
07:17:32.00	+37:45:32.50	MACSJ0717.5+3745	ACIS-I	NONE	71
04:16:08.60	-24:04:40.60	MACSJ0416.1-2403	ACIS-I	NONE	217
11:49:35.10	+22:24:18.40	MACSJ1149.5+2223	ACIS-I	NONE	232

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 15900132

Title: The Chandra Deep Field-South: A Peerless Ultradeep Survey for Exploring the Distant X-ray Universe

Type: XVP Total Time (ks): 4000

PI Name: William Brandt

We propose to push the CDF-S exposure to 8 Ms to create a peerless ultradeep survey for exploring the distant X-ray universe. The powerful combination of improved sensitivity and improved photon statistics will (1) determine how obscured SMBHs grow and co-evolve with galaxies through the z ~ 1-4 era of massive galaxy assembly; (2) constrain the majority AGN population in the first galaxies at z ~ 4-8; and (3) clarify the evolution of X-ray binary populations in high-redshift starburst and normal galaxies. The proposed observations target parameter space that has never been probed by X-ray surveys and will be unequaled for decades. They will also be critical for complementing future ultradeep surveys with, e.g., ALMA, JWST, and ELTs.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
03:32:28.10	-27:48:26.40	Chandra Deep Field-South	ACIS-I	NONE	3000

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 15900142

Title: The Tarantula -- Revealed by X-rays (T-ReX): A Definitive Chandra Investigation of 30 Doradus

Type: XVP Total Time (ks): 2000

PI Name: Leisa Townsley

30 Doradus is the most important star-forming complex in the Local Group, offering a microscope on starburst astrophysics. At its heart is R136, the most massive resolved stellar cluster, containing the most massive stars known. Across 30 Dor's 250-pc extent, stellar winds and supernovae have carved its ISM into an amazing display of arcs, pillars, and bubbles. So far, Chandra has devoted only 114 ks to this iconic target, limiting our studies just to the most massive stars and large-scale diffuse phenomena. This deep observation will finally exploit Chandra's fine spatial resolution to study ISM interfaces on 1--10 pc scales, the full complement of massive stars, and the brightest pre-main sequence stars that trace 25 Myrs of star formation in this incomparable nearby starburst.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
05:38:42.40	-69:06:02.90	30 Doradus	ACIS-I	NONE	2000

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 15900275

Title: The largest complete sample of Local AGN

Type: GO Total Time (ks): 15

PI Name: Marco Ajello

We propose a quick snapshot program with Chandra to observe the remaining 3 AGN detected by BAT that do not have any X-ray observation in the 0.1-10 keV band. These AGN are expected to be absorbed by 23

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
04:55:54.00	-75:31:24.60	SWIFT J0455.8-753	ACIS-I	NONE	5
09:20:04.50	+37:11:03.80	SWIFT J0920.0+3711	ACIS-I	NONE	5
20:21:48.30	+44:00:00.00	SWIFT J2021.8+4400	ACIS-I	NONE	5

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 15900454

Title: Hot gas emission and AGN-galaxy coevolution at the dawn of cluster formation

Type: GO Total Time (ks): 96

PI Name: Emanuele Daddi

We propose 96ks Chandra observations (tripling the available integration) in the field of the cluster CL J1449+0856 at z=2, the most distant X-ray detected and spectroscopically confirmed cluster. The proposed observations will allow us to confirm the presence of a hot atmosphere with S/N>3-4 directly with Chandra, measure its luminosity and hence infer the total (dark) mass of the cluster. With 3-times deeper sensitivity for point source detection we will study in detail the AGN activity in the structure. A wealth of supporting observations at all wavelengths, comparable to prime 'deep fields', guarantees the scientific return of the Chandra data.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
14:49:14.00	+08:56:21.00	CL J1449+0856	ACIS-S	NONE	96

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 15900537

Title: The growth of the most massive black holes and galaxies: A study of AGN in an overdensity at z=2.53.

Type: GO Total Time (ks): 100

PI Name: Paul Martini

Chandra observations of two cluster progenitor candidates at z>2 suggest that luminous AGN may be more common in dense environments at high redshift. This is starkly different from the local universe, where luminous AGN are less common in clusters of galaxies. We propose to measure the AGN fraction in a substantial new overdensity at z=2.53 with a 100ks ACIS-I observation. Based on the large population of Halpha-emitters in this region, we expect to identify 6-13 luminous AGN, and thus substantially increase the number of luminous AGN in substantial overdensities at z>2. We will use these data to quantify the correlation between AGN and environment, and thus study the early evolution of the most massive galaxies and supermassive black holes that reside in massive clusters today.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
16:01:17.30	-00:28:47.00	4C -00.62	ACIS-I	NONE	100

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 15900685

Title: The demographics of dark gamma-ray burst hosts

Type: TOO Total Time (ks): 60

PI Name: Andrew Levan

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)
		DARK-GRB1	ACIS-S	NONE	15
		DARK-GRB1	ACIS-S	NONE	15

Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 15910352

Title: Chandra Studies of Unidentified X-ray Sources in the Galactic Bulge

Type: GO Total Time (ks): 24

PI Name: Hideyuki Mori

We propose to study a complete X-ray sample in the luminosity range of > 10^34 erg s^-1 in the Galactic bulge, including 5 unidentified sources detected in the ROSAT All Sky Survey. Our goal is to obtain a clear picture about X-ray populations in the bulge, by utilizing the excellent Chandra position accuracy leading to unique optical identification together with the X-ray spectral properties. This is a new step toward understanding the formation history of the bulge. Furthermore, because the luminosity range we observe corresponds to a ``missing link'' region ever studied for a neutron star or blackhole X-ray binary, our results are also unique to test accretion disk theories at intermediate mass accretion rates.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
17:08:56.90	-23:59:36.00	1RXS J170856.9-235936	ACIS-S	NONE	7
17:45:59.60	-37:00:55.00	1RXS J174559.6-370055	ACIS-S	NONE	4
18:11:19.40	-27:59:39.00	1RXS J181119.4-275939	ACIS-S	NONE	4
18:23:39.20	-34:54:12.00	1RXS J182339.2-345412	ACIS-S	NONE	2
17:22:31.60	-19:04:22.00	1RXS J172231.6-190422	ACIS-S	NONE	7

Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 15910500

Title: PROBING THE ENERGY THRESHOLD FOR TRIGGERED STAR FORMATION

Type: GO Total Time (ks): 25

PI Name: Chip Kobulnicky

Massive stars may trigger new generations of star formation (SF) in surrounding molecular clouds. The efficiency of triggering imay scale with the ionizing luminosity of the central stars, but there may also be a lower energy threshold. The intermediate-mass SF complex G38.9 offers a nearby and clean sightline to test this idea. The region contains four 0.5-3 Myr interstellar bubbles powered by, at most, a late-O star with N_LyC<10^47 ph/s. We request a 25 ks ACIS-I observation to complete the Spitzer IR YSO census by identifying the diskless young stars and mapping their distribution. Clusters of X-ray active young stars in and around the bubble rims would reveal triggering missed by IR surveys, and their absence would support the claim that triggering has not been effective.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
19:05:55.00	+05:47:48.00	G38.9-0.44	ACIS-I	NONE	25

Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 15910506

Title: An X-ray View of Hypervelocity Star HVS5

Type: GO Total Time (ks): 60

PI Name: Junfeng Wang

Hypervelocity stars (HVSs) are a new class of objects traveling in the Galactic halo at velocities ~400-750 km/s (unbound to the Milky Way), most of which are main sequence B-type stars. We identified an interesting hypervelocity star (HVS5; minimum velocity of 663 km/s in the Galactic rest frame) that shows cometary optical morphology, suggesting a tail behind a fast moving object. We propose a 60 ks Chandra ACIS-S observation of HVS5 to search for X-ray emission from gas swept by the star and shock heated to high temperature. Our goal is to learn about the shock speed and the ambient halo medium in which HVSs are traveling. In the case of non-detection, we can still place constraint on the mass loss rate.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
09:17:59.50	+67:22:38.30	HVS5	ACIS-S	NONE	60

Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 15910711

Title: Localizing NuSTAR-Discovered Sources in the Galactic Plane

Type: TOO Total Time (ks): 20

PI Name: John Tomsick

The NuSTAR satellite launched in 2012 June and operates in the hard X-ray band with unprecedented angular resolution. In addition to improved imaging and better hard X-ray source localizations, this leads to detection sensitivities that are orders of magnitude lower than previous hard X-ray satellites, and a main 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. This TOO proposal is to follow-up future transient or highly variable source discovered by NuSTAR in order to obtain a sub-arcsecond position and determine their nature.

Target Name	Det.	Grating	Exp.Time (ks)
NuSTAR Hard Transient #1	ACIS-S	NONE	5
NuSTAR Hard Transient #2	ACIS-S	NONE	5
NuSTAR Soft Transient #1	ACIS-S	NONE	5
NuSTAR Soft Transient #2	ACIS-S	NONE	5

Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 15910826

Title: The Sgr C complex: a cosmic ray dominated region?

Type: GO Total Time (ks): 100

PI Name: Simona Soldi

We propose a 100 ks Chandra observation of Sgr C to unveil the origin of the Fe Kalpha emission in the region. Different scenarios have been proposed based on cosmic-ray irradiation of the molecular clouds, or on illumination by a past flare of SgrA*. This observation offers the unique opportunity to study the variability of the 6.4 keV emission: stable emission in the vicinity of the supernova remnant G359.41-0.12 would suggest a cosmic ray dominated region. The excellent angular resolution of Chandra will also allow to characterize the apparent interaction of the SNR with dense molecular material, a candidate site for intense cosmic-ray production. Finally, we will be able to study the past emission from SgrA*, analysing the time behaviour of other clouds in the field of view.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time (ks)
17:44:22.00	-29:24:53.60	Sgr C	ACIS-I	NONE	100

The Chandra X-Ray Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory. 60 Garden Street, Cambridge, MA 02138 USA. Email: cxchelp@head.cfa.harvard.edu Smithsonian Institution, Copyright © 1998-2024. All rights reserved.