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The host galaxies and explosion sites of long-duration gamma ray bursts: <i>Hubble Space Telescope</i> near-infrared imaging

J. LymanDepartment of Physics, University of Warwick, Coventry CV4 7AL, UKA. J. LevanDepartment of Physics, University of Warwick, Coventry CV4 7AL, UKN. R. TanvirDepartment of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UKJ. P. U. FynboDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 København Ø, DenmarkJ. T. W. McGuireDepartment of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UKD. A. PerleyDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 København Ø, DenmarkC. R. AngusDepartment of Physics, University of Warwick, Coventry CV4 7AL, UKJ. S. BloomDepartment of Astronomy, University of California, Berkeley, CA 94720, USAChristopher J. ConseliceSchool of Physics & Astronomy, The University of Nottingham, University Park, Nottingham NG7 2RD, UKA. S. FruchterSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USAJ. HjorthDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 København Ø, DenmarkP. JakobssonCentre for Astrophysics and Cosmology, Science Institute, University of Iceland, Dunhagi 5, 107 Reykjavík, IcelandR. L. C. StarlingDepartment of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK

2017en

ABI

Annotatsiya

We present the results of a Hubble Space Telescope WFC3/F160WSnapshot survey of the host galaxies of 39 long-duration gamma-ray bursts (LGRBs) at z < 3. We have non-detections of hosts at the locations of four bursts. Sufficient accuracy to astrometrically align optical afterglowimages and determine the location of the LGRB within its hostwas possible for 31/35 detected hosts. In agreement with other work, we find the luminosity distribution of LGRB hosts is significantly fainter than that of a star formation rate-weighted field galaxy sample over the same redshift range, indicating LGRBs are not unbiasedly tracing the star formation rate. Morphologically, the sample of LGRB hosts is dominated by spiral-like or irregular galaxies. We find evidence for evolution of the population of LGRB hosts towards lower luminosity, higher concentrated hosts at lower redshifts. Their half-light radii are consistent with other LGRB host samples where measurements were made on rest-frame UV observations. In agreement with recent work, we find their 80 per cent enclosed flux radii distribution to be more extended than previously thought, making them intermediate between core-collapse supernova (CCSN) and superluminous supernova (SLSN) hosts. The galactocentric projectedoffset distribution confirms LGRBs as centrally concentrated, much more so than CCSNe and similar to SLSNe. LGRBs are strongly biased towards the brighter regions in their host light distributions, regardless of their offset. We find a correlation between the luminosity of the LGRB explosion site and the intrinsic column density, NH, towards the burst. © 2017 The Authors.

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DOI: 10.1093/mnras/stx220

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