Extinction and metal column density of HI regions up to redshift z~2

Details Extinction and metal column density of HI regions up to redshift z~2 Extinction and metal column density of HI regions up to redshift z~2

2006-04-13

arxiv.org/abs/astro-ph/0604296v1

Astron.Astrophys.454:151-164,2006

Astronomy and Astrophysics

Astrophysics

Accepted for publication on Astronomy & Astrophysics, 18 pages, 5 figures

Scientific paper

10.1051/0004-6361:20054742

We used the photometric database of the Sloan Digital Sky Survey (SDSS) to estimate the reddening of 13 SDSS quasars selected on the basis of the presence of zinc absorption lines in an intervening Damped Ly alpha (DLA) system. In 5 of these quasars the reddening is detected at ~2 sigma confidence level in two independent color indices of the SDSS ugriz photometric system. A detailed analysis of the data supports an origin of the reddening in the intervening absorbers. We used these rare measurements of extinction in DLA systems to probe the relation between extinction and metal column density in the interval of absorption redshift 0.7

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