Chrimes, Ashley, Levan, Andrew J., Stanway, Elizabeth R., Lyman, J.D., Fruchter, A., Jakobsson, P., O’Brien, P., Perley, D.A., Tanvir, N.R., Wheatley, Peter J. and Wiersema, Klaas (2019) Chandra and Hubble Space Telescope observations of dark gamma-ray bursts and their host galaxies. Monthly Notices of the Royal Astronomical Society, 486 (3). doi:10.1093/mnras/stz1039

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Abstract

We present a study of 21 dark gamma-ray burst (GRB) host galaxies, predominantly using X-ray afterglows obtained with the Chandra X-Ray Observatory (CXO) to precisely locate the burst in deep Hubble Space Telescope (HST) imaging of the burst region. The host galaxies are well-detected in F160W in all but one case and in F606W imaging in ∼ 60 per cent of cases. We measure magnitudes and perform a morphological analysis of each galaxy. The asymmetry, concentration and ellipticity of the dark burst hosts are compared against the host galaxies of optically bright GRBs. In agreement with other studies, we find that dark GRB hosts are redder and more luminous than the bulk of the GRB host population. The distribution of projected spatial offsets for dark GRBs from their host galaxy centroids is comparable to that of optically-bright bursts. The dark GRB hosts are physically larger, more massive and redder, but are morphologically similar to the hosts of bright GRBs in terms of concentration and asymmetry. Our analysis constrains the fraction of high redshift (z > 5) GRBs in the sample to ∼14 per cent, implying an upper limit for the whole long-GRB population of ≤4.4 per cent. If dust is the primary cause of afterglow darkening amongst dark GRBs, the measured extinction may require a clumpy dust component in order to explain the observed offset and ellipticity distributions.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Gamma ray bursts
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Oxford University Press
ISSN:	1745-3933
Official Date:	July 2019
Dates:	Date Event July 2019 Published 15 April 2019 Available 10 April 2019 Accepted
Date of first compliant deposit:	29 April 2019
Volume:	486
Number:	3
DOI:	10.1093/mnras/stz1039
Status:	Peer Reviewed
Publication Status:	Published
Publisher Statement:	This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record A A Chrimes, A J Levan, E R Stanway, J D Lyman, A S Fruchter, P Jakobsson, P O’Brien, D A Perley, N R Tanvir, P J Wheatley, K Wiersema, Chandra and Hubble Space Telescope observations of dark gamma-ray bursts and their host galaxies, Monthly Notices of the Royal Astronomical Society, Volume 486, Issue 3, July 2019, Pages 3105–3117, https://0-doi-org.pugwash.lib.warwick.ac.uk/10.1093/mnras/stz1039 is available online at: https://doi.org/10.1093/mnras/stz1039
Access rights to Published version:	Restricted or Subscription Access
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID 1763016 [STFC] Science and Technology Facilities Council http://dx.doi.org/10.13039/501100000271 ST/P000495/1 [STFC] Science and Technology Facilities Council http://dx.doi.org/10.13039/501100000271 NAS 5-26555 [NASA] National Aeronautics and Space Administration http://dx.doi.org/10.13039/100000104 NNX08AR22G [NASA] National Aeronautics and Space Administration http://dx.doi.org/10.13039/100000104 AST-1238877 National Science Foundation http://dx.doi.org/10.13039/100000001 AyA2014-55216 [MINECO] Ministerio de Economía y Competitividad http://dx.doi.org/10.13039/501100003329
Open Access Version:	ArXiv

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