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Astrophysics

Title: Gas and dust properties in the afterglow spectra of GRB 050730

Authors: R.L.C. Starling (1), P.M. Vreeswijk (2), S.L. Ellison (3), E. Rol (4), K. Wiersema (1), A.J. Levan (4,5), N.R. Tanvir (5), R.A.M.J. Wijers (1), C. Tadhunter (6), J.R. Zaurin (6), R.M. Gonzalez Delgado (7) ((1) Amsterdam, (2) ESO, (3) Victoria, (4) Leicester, (5) Herts., (6) Sheffield, (7) CSIC)
Abstract: We present 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.
Comments: 5 pages, 2 figures. Submitted to A&A Letters. Some references and typos corrected
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0508237
  (or arXiv:astro-ph/0508237v2 for this version)

Submission history

From: Rhaana L. C. Starling [view email]
[v1] Wed, 10 Aug 2005 14:52:05 GMT (235kb)
[v2] Fri, 12 Aug 2005 12:33:13 GMT (235kb)
[v3] Mon, 12 Sep 2005 15:39:36 GMT (235kb)