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The optically unbiased GRB host (TOUGH) survey. VI. Radio observations ATz≲ 1 and consistency with typical star-forming galaxies
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(2012) The optically unbiased GRB host (TOUGH) survey. VI. Radio observations ATz≲ 1 and consistency with typical star-forming galaxies. Astrophysical Journal, Vol.755 (No.2). p. 85. doi:10.1088/0004-637X/755/2/85 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.1088/0004-637X/755/2/85
Abstract
The objective of this paper is to determine the level of obscured star formation activity and dust attenuation in a sample of gamma-ray burst (GRB) hosts, and to test the hypothesis that GRB hosts have properties consistent with those of the general star-forming galaxy populations. We present a radio continuum survey of all z < 1 GRB hosts in The Optically Unbiased GRB Host (TOUGH) sample supplemented with radio data for all (mostly pre-Swift) GRB-SN hosts discovered before 2006 October. We present new radio data for 22 objects and have obtained a detection for three of them (GRB 980425, 021211, 031203; none in the TOUGH sample), increasing the number of radio-detected GRB hosts from two to five. The star formation rate (SFR) for the GRB 021211 host of ~825 M ☉ yr–1, the highest ever reported for a GRB host, places it in the category of ultraluminous infrared galaxies. We found that at least ~63% of GRB hosts have SFR < 100 M ☉ yr–1 and at most ~8% can have SFR > 500 M ☉ yr–1. For the undetected hosts the mean radio flux (<35 μJy 3σ) corresponds to an average SFR < 15 M ☉ yr–1. Moreover, 88% of the z 1 GRB hosts have ultraviolet dust attenuation A UV < 6.7 mag (visual attenuation AV < 3 mag). Hence, we did not find evidence for large dust obscuration in a majority of GRB hosts. Finally, we found that the distributions of SFRs and A UV of GRB hosts are consistent with those of Lyman break galaxies, Hα emitters at similar redshifts, and of galaxies from cosmological simulations. The similarity of the GRB population with other star-forming galaxies is consistent with the hypothesis that GRBs, a least at z 1, trace a large fraction of all star formation, and are therefore less biased indicators than once thought.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Astrophysical Journal | ||||
Publisher: | IOP Publishing | ||||
ISSN: | 0004-637X | ||||
Official Date: | 20 August 2012 | ||||
Dates: |
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Volume: | Vol.755 | ||||
Number: | No.2 | ||||
Page Range: | p. 85 | ||||
DOI: | 10.1088/0004-637X/755/2/85 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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