The Evolution and Space Density of Damped Lyman-alpha Galaxies

Details The Evolution and Space Density of Damped Lyman-alpha Galaxies The Evolution and Space Density of Damped Lyman-alpha Galaxies

2000-08-11

arxiv.org/abs/astro-ph/0008172v1

Astrophys.Space Sci. 277 (2001) 551-554

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures. To appear in proceedings of the Euroconference: ''The Evolution of Galaxies. I - Observational Clues'' ed.

Scientific paper

10.1023/A:1012747805817

The results of a new spectroscopic survey of 66 $z \simgt 4$ quasars for Damped Lyman-alpha absorption systems are presented. The search led to the discovery of 30 new DLA candidates which are analysed in order to compute the comoving mass density of neutral gas in a non-zero lambda Universe. The possible sources of uncertainty are discussed and the implications of our results for the theories of galaxy formation and evolution are emphasized. A subsequent paper will present details of the calculations summarised here and a more extensive explanation of the consequences of our observations for the understanding of the nature of DLAs.

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