Accepted Cycle 16 Observing Proposals

NORMAL GALAXIES

Proposal Number	Subject Category	PI Name	Type	Time (ks)	Title
16620053	NORMAL GALAXIES: X-RAY POPULATIONS	Garmire	GTO	100	Monitoring the Tidal Interaction of the Dusty Object G2 Appraoching Sgr A*
16620080	NORMAL GALAXIES: X-RAY POPULATIONS	Maccarone	GO	60	AN EFFICIENT SURVEY FOR GLOBULAR CLUSTER BLACK HOLES WITHIN 20 MPC
16620121	NORMAL GALAXIES: X-RAY POPULATIONS	Levine	GO	50	Galaxies in Collision: Arp 273
16620187	NORMAL GALAXIES: X-RAY POPULATIONS	Kaaret	GO	98	Searching for Accreting Black Holes in Lyman Continuum Emitters
16620343	NORMAL GALAXIES: X-RAY POPULATIONS	Gallo	GO	95	Super-massive black holes and nuclear star clusters in late type galaxies
16620657	NORMAL GALAXIES: X-RAY POPULATIONS	Darling	GO	60	Massive Black Holes in Water Maser Merging Galaxies
16620677	NORMAL GALAXIES: X-RAY POPULATIONS	Peacock	GO	100	Does the IMF vary with galaxy mass? The X-ray binary population of a key galaxy, NGC7457
16620755	NORMAL GALAXIES: X-RAY POPULATIONS	Williams	LP	350	A Chandra Legacy Survey of the Disk of M31
16620759	NORMAL GALAXIES: X-RAY POPULATIONS	Haggard	TOO	100	Triggered Observations of the Tidal Disruption of G2 As It Encounters Sgr A*
16620791	NORMAL GALAXIES: X-RAY POPULATIONS	Lin	GO	40	Chandra Observation of an X-ray Outbursting Intermediate-mass Black Hole Candidate
16620871	NORMAL GALAXIES: X-RAY POPULATIONS	van den Berg	GO	10	S364 IN THE OLD OPEN CLUSTER M67: EXOPLANET HOST OR ACTIVE BINARY?

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620053

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

Type: GTO Total Time (ks): 100

PI Name: Gordon Garmire

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

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

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620080

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

Type: GO Total Time (ks): 60

PI Name: Thomas Maccarone

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

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

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620121

Title: Galaxies in Collision: Arp 273

Type: GO Total Time (ks): 50

PI Name: Alan Levine

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

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

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620187

Title: Searching for Accreting Black Holes in Lyman Continuum Emitters

Type: GO Total Time (ks): 98

PI Name: Philip Kaaret

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

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

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620343

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

Type: GO Total Time (ks): 95

PI Name: Elena Gallo

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

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

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620657

Title: Massive Black Holes in Water Maser Merging Galaxies

Type: GO Total Time (ks): 60

PI Name: Jeremy Darling

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

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

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620677

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

Type: GO Total Time (ks): 100

PI Name: Mark Peacock

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

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

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620755

Title: A Chandra Legacy Survey of the Disk of M31

Type: LP Total Time (ks): 350

PI Name: Benjamin Williams

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

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

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620759

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

Type: TOO Total Time (ks): 100

PI Name: Daryl Haggard

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

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

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620791

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

Type: GO Total Time (ks): 40

PI Name: Dacheng Lin

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

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

Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 16620871

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

Type: GO Total Time (ks): 10

PI Name: Maureen van den Berg

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

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

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