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Evolution of damped Lyman-alpha galaxies from hierarchical structure formation models

Published online by Cambridge University Press:  06 October 2005

Katsuya Okoshi  and
Masahiro Nagashima
Katsuya Okoshi
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan email: okoshi.katsuya@nao.ac.jp
Masahiro Nagashima
Affiliation:
Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
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Abstract

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We investigate the evolution of damped Ly$\alpha$ absorption systems (DLA) from hierarchical structure formation models by exploring the basic properties of DLA host-galaxies (DLA galaxies) to clarify the connection between DLAs and galaxies. We find that DLA galaxies primarily consist of low surface brightness dwarf galaxies. For example, at redshift $z \le 1$, DLA galaxies have typical radius 3 kpc, surface brightness 22–27 mag arc-sec$^{-2}$, and star formation rate $10^{-2}$ M$_{\odot}$/yr. We discuss selection effects in the detection in emission caused by compactness and brightness. Finally, we explore the radio properties at $z=0$ by comparing the observational results from blind radio surveys.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C199: Probing Galaxies through Quasar Absorption Lines , March 2005 , pp. 460 - 462
Copyright
© 2005 International Astronomical Union