An HI Survey of Six Local Group Analogs. II. HI properties of group
  galaxies
  We have conducted an HI 21 cm emission-line survey of six loose groups of
galaxies chosen to be analogs to the Local Group. The survey was conducted
using the Parkes Multibeam instrument and the Australia Telescope Compact Array
(ATCA) over a ~1 Mpc^2 area and covering the full depth of each group, with a
M(HI) sensitivity of ~7x10^5 M(sun). Our survey detected 110 sources, 61 of
which are associated with the six groups. All of these sources were confirmed
with ATCA observations or were previously cataloged by HIPASS. The sources all
have optical counterparts and properties consistent with dwarf irregular or
late-type spiral galaxies. We present here the HI properties of the groups and
their galaxies. We derive an HI mass function for the groups that is consistent
with being flatter than the equivalent field HIMF. We also derive a circular
velocity distribution function, tracing the luminous dark matter halos in the
groups, that is consistent with those of the Local Group and HIPASS galaxies,
both of which are shallower than that of clusters or predictions from CDM
models of galaxy formation.
