Hi and Galaxy Formation in Loose Groups

Publications of the Astronomical Society of Australia

Daniel J. Pisano¹ 

关键词: Local Group;    intergalactic medium;    galaxies: dwarf;    galaxies: formation;   

DOI  :  10.1071/AS04055

学科分类：天文学(综合)

来源: CSIRO

【 摘 要 】

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 analogues to the HVCs should be visible in other groups. In this paper, I review the observations of Hi clouds lacking stars around other galaxies and in groups, present early results from our Hi survey of loose groups analogous to the Local Group, and discuss implications for the nature of HVCs and galaxy formation.

【 授权许可】

Unknown