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The Optically Unbiased GRB Host (Tough) Survey. VII. the Host Galaxy Luminosity Function: Probing the Relationship between GRBs and Star Formation to Redshift ∼6

Schulze, S and Chapman, R and Hjorth, J and Levan, AJ and Jakobsson, P and Björnsson, G and Perley, DA and Krühler, T and Gorosabel, J and Tanvir, NR and Postigo, ADU and Fynbo, JPU and Milvang-Jensen, B and MØller, P and Watson, DJ (2015) The Optically Unbiased GRB Host (Tough) Survey. VII. the Host Galaxy Luminosity Function: Probing the Relationship between GRBs and Star Formation to Redshift ∼6. The Astrophysical Journal, 808 (1). ISSN 1538-4357

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Abstract

Gamma-ray bursts (GRBs) offer a route to characterizing star-forming galaxies and quantifying high-z star formation that is distinct from the approach of traditional galaxy surveys: GRB selection is independent of dust and probes even the faintest galaxies which can evade detection in flux-limited surveys. However, the exact relation between the GRB rate and the star formation rate (SFR) throughout all redshifts is controversial. The Optically Unbiased GRB Host (TOUGH) survey includes observations of all GRB hosts (69) in an optically unbiased sample of Swift GRBs; we utilize these to constrain the evolution of the UV GRB-host-galaxy luminosity function (LF) between z = 0 and z = 4.5, and compare this with LFs derived from both Lyman-break galaxy (LBG) surveys and simulation modeling. At all redshifts we find the GRB hosts to be most consistent with an LF derived from SFR weighted models incorporating GRB production via both metallicity-dependent and independent channels with a relatively high level of bias toward low metallicity hosts. In the range an SFR weighted LBG derived (i.e., non-metallicity biased) LF is also a reasonable fit to the data. Between z ∼ 3 and z ∼ 6, we observe an apparent lack of UV bright hosts in comparison with LBGs, though the significance of this shortfall is limited by nine hosts of unknown redshift. © 2015. The American Astronomical Society. All rights reserved.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
Date Deposited: 22 Feb 2017 08:55
Last Modified: 22 Feb 2017 08:55
DOI or Identification number: 10.1088/0004-637X/808/1/73
URI: http://researchonline.ljmu.ac.uk/id/eprint/5689

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