Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010iaus..262..402o&link_type=abstract
Stellar Populations – Planning for the Next Decade, Proceedings of the International Astronomical Union, IAU Symposium, Volume 2
Astronomy and Astrophysics
Astronomy
Galaxies: Evolution, Quasars: Absorption Lines, Radio Lines: Galaxies
Scientific paper
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 ≥ 108 M&sun;. By contrast, in the low-mass range MHI ≤ 107 M&sun;, sub-DLA galaxies replace DLA galaxies as the dominant population. The HI-selected galaxies would be a strong probe of DLA/sub-DLA systems.
Gouda Naoteru
Minowa Yosuke
Nagashima Masahiro
Okoshi Katsuya
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