STUDYING GALAXY FORMATION IN LOOSE GALAXY GROUPS
ABSTRACT We present the results of our Hi survey of six loose groups of galaxies analogous to the Local Group. The survey was conducted
using the Parkes telescope and the Australia Telescope Compact Array to produce a census of all the gas-rich galaxies and
analogs to the high-velocity clouds (HVCs) within these groups down to MHI< 107 as a test of models of galaxy formation. We present the Hi mass function and halo mass function of the loose groups and show
that they are consistent with those of the Local Group. We discuss the possible role of HVCs in solving the “missing satellite”
problem and discuss the implications of our observations for models of galaxy formation.