Abstract
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⊙. By contrast, in the low-mass range MHI ≤ 10 M⊙, sub-DLA galaxies replace DLA galaxies as the dominant population. The HI-selected galaxies would be a strong probe of DLA/sub-DLA systems.
Proceedings of the International Astronomical Union, 5(S262), pp.402-403; 2009
Journal
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- Proceedings of the International Astronomical Union
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Proceedings of the International Astronomical Union 5 (S262), 402-403, 2009-08
Cambridge University Press
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Details 詳細情報について
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- CRID
- 1050568772228679296
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- NII Article ID
- 120006986074
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- ISSN
- 17439213
- 17439221
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- HANDLE
- 10069/33967
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- IRDB
- CiNii Articles