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29 March 2024 |
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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 | Affiliation: | 4,5), 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 | 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(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 | Services: | Forum | Review | PDF | Favorites |
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