Accepted Cycle 16 Observing Proposals

EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number	Subject Category	PI Name	Type	Time (ks)	Title
16900624	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Levan	TOO	30	A Chandra/HST survey of dark gamma-ray bursts
16900937	EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS	Hasinger	XVP	1250	Black Hole Fingerprints from Cosmic Dawn to Cosmic Noon

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 16900624

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

Type: TOO Total Time (ks): 30

PI Name: Andrew Levan

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

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

Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 16900937

Title: Black Hole Fingerprints from Cosmic Dawn to Cosmic Noon

Type: XVP Total Time (ks): 1250

PI Name: Guenther Hasinger

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

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

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