AAS 203rd Meeting, January 2004
Session 30 Galaxy Clusters and Large Scale Structure I
Oral, Monday, January 5, 2004, 2:00-3:30pm, Centennial I/II

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[30.02] Galaxy Formation in Loose Groups

D.J. Pisano (ATNF), D.G. Barnes (Melbourne), B.K. Gibson (Swinburne), L. Staveley-Smith (ATNF), K.C. Freeman (RSAA)

We present the results of our Parkes Multibeam HI survey of 4 loose groups of galaxies analogous to the Local Group. We present a census of the HI-rich objects in these groups down to MHI<107Msun and the detailed properties of these detections from follow-up Australia Telescope Compact Array observations. To date no HI clouds without stars have been found, only previously unknown dwarf galaxies. We will discuss how the properties of these 4 groups compare with the properties of the Local Group and with different models of galaxy formation. In addition, we will discuss the implications of our observations for the nature of high-velocity clouds around the Milky Way.

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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.