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|Title:||Gas and dust properties in the afterglow spectra of GRB 050730|
|Authors:||Starling, R. L. C.|
Vreeswijk, P. M.
Ellison, S. L.
Levan, A. J.
Tanvir, N. R.
Wijers, R. A. M. J.
Zaurin, J. R.
Delgado, R. M. G.
|Publisher:||EDP Sciences for European Southern Observatory (ESO)|
|Citation:||Astronomy and Astrophysics 442, L21-L24 (2005)|
|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.|
|Rights:||Creative Commons “Attribution Non-Commercial No Derivatives” licence CC BY-NC-ND, further details of which can be found via the following link: http://creativecommons.org/licenses/by-nc-nd/4.0/|
|Description:||5 pages, 2 figures. Accepted for A&A Letters|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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