Salamanca, I, Kaper, L, Vreeswijk, PM, Ellison, SL, Rol, E, Tanvir, N, Wijers, RAMJ, Maxted, PFL and Heuvel, EVD (2001) The host galaxy of GRB010222: the strongest damped Lyman-alpha system known.

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Analysis of the absorption lines in the afterglow spectrum of the gamma-ray burst GRB010222 indicates that its host galaxy (at a redshift of z=1.476) is the strongest damped Lyman-alpha (DLA) system known, having a very low metallicity and modest dust content. This conclusion is based on the detection of the red wing of Lyman-alpha plus a comparison of the equivalent widths of ultraviolet Mg I, Mg II, and Fe II lines with those in other DLAs. The column density of H I, deduced from a fit to the wing of Lyman-alpha, is (5 +/- 2) 10^22 cm^-2. The ratio of the column densities of Zn and Cr lines suggests that the dust content in our line of sight through the galaxy is low. This could be due to either dust destruction by the ultraviolet emission of the afterglow or to an initial dust composition different to that of the diffuse interstellar material, or a combination of both.

Item Type: Article
Uncontrolled Keywords: Gamma-ray: burst, Galaxies: absorption lines
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 20 Aug 2015 13:51
Last Modified: 26 May 2016 11:33

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