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29 March 2024
 
  » arxiv » astro-ph/0508237

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Gas and dust properties in the afterglow spectra of GRB 050730
R.L.C. Starling ; P.M. Vreeswijk ; S.L. Ellison ; E. Rol ; K. Wiersema ; A.J. Levan ; N.R. Tanvir ; R.A.M.J. Wijers ; C. Tadhunter ; J.R. Zaurin ; R.M. Gonzalez Delgado ; C. Kouveliotou ;
Date 10 Aug 2005
Subject astro-ph
Affiliation4,5), N.R. Tanvir , R.A.M.J. Wijers , C. Tadhunter , J.R. Zaurin , R.M. Gonzalez Delgado , C. Kouveliotou ( Amsterdam, ESO, Victoria, Leicester, Herts., Sheffield, CSIC, NASA/MSFC
AbstractWe 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(HI) = 22.1 +/- 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 HI absorption causing the DLA is most likely located further out.
Source arXiv, astro-ph/0508237
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