Chandra X-Ray Observatory
	(CXC)

Accepted Cycle 11 Observing Proposals

EXTRAGALACTIC DIFFUSE EMISSION & SURVEYS

Proposal NumberSubject CategoryPI NameTitle
11900125EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYSLevanA survey of dark gamma-ray burst hosts
11900514EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYSGultekinCOMBH: Chandra Observations of M-sigma Black Holes
11900760EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYSCheungIdentifying Unidentified Fermi-LAT Objects (UFOs) at High-Latitude

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 11900125

Title: A survey of dark gamma-ray burst hosts

PI Name: Andrew Levan

A fraction of gamma-ray bursts (GRBs) are dark in the optical, often suggesting suppression relative to the X-ray flux. These bursts may originate in highly obscured environments, different from those of the optically bright GRBs. We propose to continue our earlier program by conducting a set of modest ToO observations of these GRBs. Chandra observations will provide precise burst positions (~0.5") and, unlike Swift-XRT observations will enable the unambiguous location of the host galaxy. Subsequent HST imaging will provide broadband magnitudes, colours and morphologies. Our early results suggest that dark bursts hosts can be markedly different from those of the bright population, and motivates the need to gather a larger sample to accurately constrain their properties.

R.A. Dec. Target Name Det. Grating Exp.Time
Dark-GRB1ACIS-SNONE15
Dark-GRB2ACIS-SNONE15
Dark-GRB3ACIS-SNONE15

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 11900514

Title: COMBH: Chandra Observations of M-sigma Black Holes

PI Name: Kayhan Gultekin

Galaxies with dynamically-measured central BH masses allow us to understand BH accretion, jets, and interactions between BHs and host galaxies with a clarity not possible in random surveys. By measuring true Eddington fractions, we can calculate the energy in radiation vs mechanical jet energy and the efficacy of BHs in heating nuclear regions and affecting star formation. Remarkably, 1/3 of SMBHs making up the M-sigma relation have been poorly observed or totally unobserved with Chandra. We propose a survey of 15 M-sigma galaxies to complete the sample of reliable M-sigma SMBHs. For each galaxy we propose to obtain 30-60 ks exposures and an hour-long VLA observation. This survey will test and extend the fundamental plane of BH activity and facilitate studies of the origin of M-sigma.

R.A. Dec. Target Name Det. Grating Exp.Time
03:19:41.10-19:24:40.90NGC1300ACIS-SNONE30
09:13:43.00+76:28:31.20NGC 2748ACIS-SNONE30
09:12:24.40+35:01:39.10NGC2778ACIS-SNONE30
12:20:17.80+75:22:15.20NGC4291ACIS-SNONE30
12:51:48.00-10:27:17.00NGC4742ACIS-SNONE30
13:19:31.70-12:39:25.10NGC5077ACIS-SNONE30
14:21:03.70+03:16:15.60NGC5576ACIS-SNONE30
10:48:16.90+12:37:45.40NGC3384ACIS-SNONE30
12:30:57.70+12:16:13.30NGC4486AACIS-SNONE30
12:28:60.00+13:58:42.80NGC4459ACIS-SNONE30
12:39:55.90+10:10:33.90NGC4596ACIS-SNONE30
23:00:59.90+30:08:41.60NGC7457ACIS-SNONE30

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 11900760

Title: Identifying Unidentified Fermi-LAT Objects (UFOs) at High-Latitude

PI Name: Chi (Teddy) Cheung

We propose a Chandra study of 8 high Galactic latitude gamma-ray sources in the Fermi-LAT bright source list. These sources are currently unidentified, i.e., they are not clearly associated with established classes of gamma-ray emitters like blazars and pulsars. The proposed observations will determine the basic properties (fluxes, positions, hardness ratio/spectra) of all X-ray sources down to a 0.3-10 keV flux limit of 1.5e-14 erg/cm2/s within the Fermi-LAT localization circles. This will enable further follow-up at other wavelengths, with the ultimate goal to reveal the nature of these enigmatic gamma-ray sources.

R.A. Dec. Target Name Det. Grating Exp.Time
16:53:40.80-01:59:49.20J1653.4-0200ACIS-INONE20
22:14:42.00+30:02:45.60J2214.8+3002ACIS-INONE20
22:41:53.80-52:37:04.80J2241.7-5239ACIS-INONE20
13:11:49.70-34:28:37.20J1311.9-3419ACIS-INONE20
23:39:37.20-05:33:18.00J2339.8-0530ACIS-INONE20
Smithsonian Institute Smithsonian Institute

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