Damped Lyman alpha systems and disk galaxies: number density, column density distribution and gas density

Details Damped Lyman alpha systems and disk galaxies: number density, column density distribution and gas density Damped Lyman alpha systems and disk galaxies: number density, column density distribution and gas density

2002-08-26

arxiv.org/abs/astro-ph/0208457v1

Mon.Not.Roy.Astron.Soc.338:L31,2003

Astronomy and Astrophysics

Astrophysics

11 pages, 10 figures, accepted in MNRAS

Scientific paper

10.1046/j.1365-8711.2003.06317.x

We present a comparison between the observed properties of damped Lyman alpha systems (DLAs) and the predictions of simple models for the evolution of present day disk galaxies, including both low and high surface brightness galaxies. We focus in particular on the number density, column density distribution and gas density of DLAs, which have now been measured in relatively large samples of absorbers. From the comparison we estimate the contribution of present day disk galaxies to the population of DLAs, and how it varies with redshift. Based on the differences between the models and the observations, we also speculate on the nature of the fraction of DLAs which apparently do not arise in disk galaxies.

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