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THE OPTICALLY UNBIA...
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
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Michalowski, M. J. (author)
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Kamble, A. (author)
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Hjorth, J. (author)
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Malesani, D. (author)
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Reinfrank, R. F. (author)
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Bonavera, L. (author)
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Ceron, J. M. Castro (author)
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Ibar, E. (author)
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Dunlop, J. S. (author)
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Fynbo, J. P. U. (author)
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Garrett, M. A. (author)
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Jakobsson, P. (author)
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Kaplan, D. L. (author)
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Kruhler, T. (author)
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Levan, A. J. (author)
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Massardi, M. (author)
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Pal, S. (author)
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- Sollerman, Jesper (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Tanvir, N. R. (author)
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van der Horst, A. J. (author)
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Watson, D. (author)
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Wiersema, K. (author)
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(creator_code:org_t)
- 2012
- 2012
- English.
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In: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 755:2, s. 85-
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- dust
- extinction
- galaxies: evolution
- galaxies: ISM
- galaxies: star formation
- gamma-ray burst: general
- radio continuum: galaxies
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Michalowski, M. ...
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Kamble, A.
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Hjorth, J.
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Malesani, D.
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Reinfrank, R. F.
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Bonavera, L.
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show more...
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Ceron, J. M. Cas ...
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Ibar, E.
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Dunlop, J. S.
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Fynbo, J. P. U.
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Garrett, M. A.
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Jakobsson, P.
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Kaplan, D. L.
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Kruhler, T.
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Levan, A. J.
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Massardi, M.
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Pal, S.
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Sollerman, Jespe ...
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Tanvir, N. R.
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van der Horst, A ...
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Watson, D.
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Wiersema, K.
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Stockholm University