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Surveys for z > 3 Damped Lyα Absorption Systems: The Evolution of Neutral Gas*

and

© 2000. The American Astronomical Society. All rights reserved. Printed in U.S.A.
, ,

An erratum for this article has been published in 2003 ApJ 592 1263

0004-637X/543/2/552

Abstract

We have completed spectroscopic observations using LRIS on the Keck 1 telescope of 30 very high redshift quasars, 11 selected for the presence of damped Lyα absorption systems and 19 with redshifts z > 3.5 not previously surveyed for absorption systems. We have surveyed an additional 10 QSOs with the Lick 120'' and the Anglo-Australian Telescope. We have combined these with previous data, resulting in a statistical sample of 646 QSOs and 85 damped Lyα absorbers with column densities Nimg1.gif ≥ 2 × 1020 atoms cm-2 covering the redshift range 0.008 ≤ z ≤ 4.694. Four main features of how the neutral gas in the universe evolves with redshift are evident from these data.

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Footnotes

  • Some of the observations presented here were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. Observations were also made using the 3.9 m Anglo-Australian Telescope at the Anglo-Australian Observatory and the Shane 3 m Telescope at the Lick Observatory.

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