The dust obscuration bias in Damped Lyman alpha systems

Details The dust obscuration bias in Damped Lyman alpha systems The dust obscuration bias in Damped Lyman alpha systems

2005-02-07

arxiv.org/abs/astro-ph/0502137v2

Astronomy and Astrophysics

Astrophysics

Astronomy and Astrophysics, in press, 20 pages, 10 figures; abridged abstract; improved figs. 3 and 5; most of mathematical fo

Scientific paper

10.1051/0004-6361:20041570

We present a new study of the effects of quasar obscuration on the statistics of Damped Ly alpha (DLA) systems. We show that the extinction of any Galactic or extragalactic HI region increases with the column density of zinc with a turning point above which background sources are suddenly obscured. We derive a relation between the extinction of a DLA system and its HI column density, N, metallicity, Z, fraction of iron in dust, f_Fe(Z), and redshift, z. From this relation we estimate the fraction of DLA systems missed as a consequence of their own extinction in magnitude-limited surveys. We derive a method for recovering the true frequency distributions of N and Z in DLAs, f_N and f_Z, using the biased distributions measured in the redshift range where the observations have sufficient statistics (1.8

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