HI and Galaxy Formation in Loose Groups
arXiv:astro-ph/0409065 · doi:10.1071/AS04055
Abstract
Models of hierarchical galaxy formation predict that large numbers of low-mass, dark matter halos remain around galaxies today. These models predict an order of magnitude more halos than observed stellar satellites in the Local Group. One possible solution to this discrepancy is that the high-velocity clouds (HVCs) around the Milky Way may be associated with the excess dark matter halos and be the gaseous remnants of the galaxy formation process. If this is the case, then analogs to the HVCs should be visible in other groups. In this paper, we review the observations of HI clouds lacking stars around other galaxies and in groups and present early results from our HI survey of loose groups analogous to the Local Group and its implications for the nature of HVCs and galaxy formation.
3 pages, 2 figures, to appear in PASA. Paper presented at workshop `Structure and Dynamics in the Local Universe' 24-26 November, 2003, Sydney, Australia
References in corpus (7)
- Squelched Galaxies and Dark Halos
- Complex C: A Low-Metallicity High-Velocity Cloud Plunging into the Milky Way
- High-Velocity Cloud Complex C: Galactic Fuel or galactic Waste?
- A Targeted Survey for HI Clouds in Galaxy Groups
- Multi-method-modeling of interacting galaxies. I. A unique scenario for NGC 4449?
- Where are the High Velocity Clouds in Local Group Analogs?
- The Gaseous Trail of the Sagittarius Dwarf Galaxy