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Neutral Gas and Metals From z = 4 to z = 0.5

Published online by Cambridge University Press:  01 August 2006

Céline Péroux
Céline Péroux*
Affiliation:
European Southern Observatory, Germany email: cperoux@eso.org
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Abstract

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A complementary method to the emission selection of high-redshift galaxies consists in the observation of absorbers along the line of sight toward a background quasar. This selection technique has a constant sensitivity at all redshifts up to z = 6 (i.e. no redshift desert) and allow to select all types of galaxies regardless of their luminosity or star formation rate. The highest column density absorbers, the Damped Lyman-α (DLAs) systems, in particular, can be used to determine the cosmic evolution of HI gas in the Universe, ΩHI, and the global metallicity in the gas phase. Since stars are known to form from HI gas, ΩHI provides an indirect tracer of the history of star formation. Recent results from several parallel VLT programmes aiming at determining the cosmological evolution of the metallicity in the neutral gas phase are presented.

Keywords

galaxies: abundances(galaxies:) intergalactic medium(galaxies:) quasars: absorption lines
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 273 - 274
Copyright
Copyright © International Astronomical Union 2007

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