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Hi and Galaxy Formation in Loose Groups

Published online by Cambridge University Press:  05 March 2013

Daniel J. Pisano
Daniel J. Pisano*
Affiliation:
CSIRO ATNF, Epping NSW 1710, Australia. Email: dj.pisano@csiro.au
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Abstract

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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.

Keywords

Local Groupintergalactic mediumgalaxies: dwarfgalaxies: formation
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 21 , Special Issue 4: Structure and Dynamics in the Local Universe , 2004 , pp. 390 - 392
Copyright
Copyright © Astronomical Society of Australia 2004

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