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THE OPTICALLY UNBIASED GRB HOST (TOUGH) SURVEY. VI. RADIO OBSERVATIONS AT z less than or similar to 1 AND CONSISTENCY WITH TYPICAL STAR-FORMING GALAXIES

Authors :
Michalowski, M. J.
Kamble, A.
Hjorth, J.
Malesani, D.
Reinfrank, R. F.
Bonavera, L.
Ceron, J. M. Castro
Ibar, E.
Dunlop, J. S.
Fynbo, J. P. U.
Garrett, M. A.
Jakobsson, P.
Kaplan, D. L.
Kruhler, T.
Levan, A. J.
Massardi, M.
Pal, S.
Sollerman, Jesper
Tanvir, N. R.
van der Horst, A. J.
Watson, D.
Wiersema, K.
Michalowski, M. J.
Kamble, A.
Hjorth, J.
Malesani, D.
Reinfrank, R. F.
Bonavera, L.
Ceron, J. M. Castro
Ibar, E.
Dunlop, J. S.
Fynbo, J. P. U.
Garrett, M. A.
Jakobsson, P.
Kaplan, D. L.
Kruhler, T.
Levan, A. J.
Massardi, M.
Pal, S.
Sollerman, Jesper
Tanvir, N. R.
van der Horst, A. J.
Watson, D.
Wiersema, K.
Publication Year :
2012

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 similar to 825 M-circle dot yr(-1), the highest ever reported for a GRB host, places it in the category of ultraluminous infrared galaxies. We found that at least similar to 63% of GRB hosts have SFR < 100 M-circle dot yr(-1) and at most similar to 8% can have SFR > 500 M-circle dot yr(-1). For the undetected hosts the mean radio flux (<35 mu Jy 3 sigma) corresponds to an average SFR < 15 M-circle dot yr(-1). Moreover, greater than or similar to 88% of the z less than or similar to 1 GRB hosts have ultraviolet dust attenuation A(UV) < 6.7 mag (visual attenuation A(V) < 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, H alpha 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 less than or similar to 1, trace a large fraction of all star formation, and are therefore less biased indicators than once thought.<br />AuthorCount:22

Details

Database :
OAIster
Notes :
English
Publication Type :
Electronic Resource
Accession number :
edsoai.on1234759876
Document Type :
Electronic Resource
Full Text :
https://doi.org/10.1088.0004-637X.755.2.85