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A mature dusty star-forming galaxy hosting GRB 080607 at z=3.036

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Chen, Hsiao-Wen, Perley, Daniel A., Wilson, Christine D., Cenko, S. Bradley, Levan, A. J., Bloom, Joshua S., 1974-, Prochaska, Jason X., Tanvir, Nial R., Dessauges-Zavadsky, Miroslava and Pettini, Max. (2010) A mature dusty star-forming galaxy hosting GRB 080607 at z=3.036. Astrophysical Journal Letters, Volume 723 (Number 2). L218-L222. ISSN 2041-8205

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Abstract

We report the discovery of the host galaxy of Swift dark burst GRB 080607 at z(GRB) = 3.036. GRB 080607 is a unique case of a highly extinguished (A(V) approximate to 3 mag) afterglow that was yet sufficiently bright for high-quality absorption-line spectroscopy. The host galaxy is clearly resolved in deep Hubble Space Telescope (HST) WF3/IR F160W images and well detected in the Spitzer IRAC 3.5 mu m and 4.5 mu m channels, while displaying little/no fluxes in deep optical images from Keck and Magellan. The extremely red optical-infrared colors are consistent with the large extinction seen in the afterglow light, suggesting that the large amount of dust and gas surface mass density seen along the afterglow sight line is not merely local but likely reflects the global dust content across the entire host galaxy. Adopting the dust properties and metallicity of the host interstellar medium derived from studies of early-time afterglow light and absorption-line spectroscopy, we perform a stellar population synthesis analysis of the observed spectral energy distribution to constrain the intrinsic luminosity and stellar population of this dark burst host. The host galaxy is best described by an exponentially declining star formation rate of e-folding time tau = 2 Gyr and an age of similar to 2 Gyr. We also derive an extinction-corrected star formation rate of SFR approximate to 125 h(-2) M-circle dot yr(-1) and a total stellar mass of M-* similar to 4 x 10(11) h(-2) M-circle dot. Our study provides an example of massive, dusty star-forming galaxies contributing to the gamma-ray burst (GRB) host galaxy population, supporting the notion that long-duration GRBs trace the bulk of cosmic star formation.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Active galaxies, Stars -- Formation, Gamma ray bursts, Cosmic abundances, Cosmic dust
Journal or Publication Title: Astrophysical Journal Letters
Publisher: IOP Publishing Ltd
ISSN: 2041-8205
Date: 10 November 2010
Volume: Volume 723
Number: Number 2
Number of Pages: 5
Page Range: L218-L222
Identification Number: 10.1088/2041-8205/723/2/L218
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Space Telescope Science Institute (U.S.), National Science Foundation (U.S.) (NSF), United States. National Aeronautics and Space Administration (NASA)
Grant number: 12005 (NASA, STScI), AST-0607510 (NSF), NAS 5-26555 (NASA)
Version or Related Resource: Erratum: Chen, H. -W., et al. (2011). Erratum : “A mature dusty star-forming galaxy hosting GRB 080607 ATz= 3.036” (2010, ApJ, 723, L218). Astrophysical Journal, 727(2), article L53. http://wrap.warwick.ac.uk/id/eprint/41640
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URI: http://wrap.warwick.ac.uk/id/eprint/4875

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