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HI-selected Galaxies As a Probe of Quasar Absorption Systems

Published online by Cambridge University Press:  13 April 2010

K. Okoshi ,
M. Nagashima ,
N. Gouda  and
Y. Minowa
K. Okoshi
Affiliation:
Tokyo University of Science, Oshamanbe, Hokkaido, 049-3514, Japan
M. Nagashima
Affiliation:
Nagasaki University, Japan
N. Gouda
Affiliation:
National Astronomical Observatory, Japan
Y. Minowa
Affiliation:
National Astronomical Observatory, Japan
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Abstract

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We investigate the properties of local HI-selected galaxies detected in blind radio surveys by using semi-analytic galaxy formation models in the hierarchical structure formation scenario. By drawing a detailed comparison between the properties of the HI-selected galaxies and the quasar absorption systems, we investigate a link between the local galaxy population and the quasar absorption systems, particularly for Damped Lymanα absorption (DLA) systems (NHI ≥ 1020.3 cm−2) and sub-DLA systems (1019 < NHI < 1020.3 cm−2).

We find that DLA galaxies, in which the HI column densities are as high as those of DLA systems, contribute primarily to the population of local HI-selected galaxies at MHI ≥ 108M⊙. By contrast, in the low-mass range MHI ≤ 107M⊙, sub-DLA galaxies replace DLA galaxies as the dominant population. The HI-selected galaxies would be a strong probe of DLA/sub-DLA systems.

Keywords

galaxies: evolutionquasars: absorption linesradio lines: galaxies
Type
Poster Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S262: Stellar Populations – Planning for the Next Decade , August 2009 , pp. 402 - 403
Copyright
Copyright © International Astronomical Union 2010

References

Okoshi, K., Nagashima, M., Gouda, N., & Yoshioka, S. 2004, ApJ, 603, 12CrossRefGoogle Scholar
Okoshi, K. & Nagashima, M. 2005, ApJ, 623, 99CrossRefGoogle Scholar
Okoshi, K., Nagashima, M., Gouda, N., & Minowa, Y. 2009, submitted to ApJGoogle Scholar
Zwaan, M. A., Meyer, M. J., Staveley-Smith, L., & Webster, R. L. 2005, MNRAS, 359, L30CrossRefGoogle Scholar