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We have conducted an HI 21 cm emission-line survey of six loose groups ofgalaxies chosen to be analogs to the Local Group. The survey was conductedusing 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 aM(HI) sensitivity of ~7x10^5 M(sun). Our survey detected 110 sources, 61 ofwhich are associated with the six groups. All of these sources were confirmedwith ATCA observations or were previously cataloged by HIPASS. The sources allhave optical counterparts and properties consistent with dwarf irregular orlate-type spiral galaxies. We present here the HI properties of the groups andtheir galaxies. We derive an HI mass function for the groups that is consistentwith being flatter than the equivalent field HIMF. We also derive a circularvelocity distribution function, tracing the luminous dark matter halos in thegroups, that is consistent with those of the Local Group and HIPASS galaxies,both of which are shallower than that of clusters or predictions from CDMmodels of galaxy formation.

An HI Survey of Six Local Group Analogs. II. HI properties of group galaxies