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Title: Gas and dust properties in the afterglow spectra of GRB 050730
Authors: Starling, R. L. C.
Wiersema, K.
Wijers, R. A. M. J.
Vreeswijk, P. M.
Ellison, S. L.
Rol, E.
Levan, A. J.
Tanvir, N. R.
Tadhunter, C.
Zaurin, J. R.
Delgado, R. M. G.
Kouveliotou, C.
First Published: Nov-2005
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2005, 442 (2)
Abstract: We present early WHT ISIS optical spectroscopy of the afterglow of gamma-ray burst GRB 050730. The spectrum shows a DLA system with the highest measured hydrogen column to date: N(H ${\small\rm {I}}$) = $22.1 \pm 0.1$ at the third-highest GRB redshift z = 3.968. Our analysis of the Swift XRT X-ray observations of the early afterglow show X-ray flares accompanied by decreasing X-ray absorption. From both the optical and the X-ray spectra we constrain the dust and gas properties of the host galaxy. We find the host to be a low metallicity galaxy, with low dust content. Much of the X-ray absorbing gas is situated close to the GRB, whilst the H I absorption causing the DLA is most likely located further out.
DOI Link: 10.1051/0004-6361:200500181
ISSN: 0004-6361
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2005 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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