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We investigate the neutral hydrogen (H  i ) content of 16 groups for which we have multiwavelength data including X‐ray observations. Wide‐field imaging of the groups was obtained with the 20‐cm multibeam system on the 64‐m Parkes telescope. We have detected 10 previously uncatalogued H  i  sources, one of which has no visible optical counterpart. We examine the H  i  properties of the groups, compared to their X‐ray characteristics, finding that those groups with a higher X‐ray temperature and luminosity contain less H  i  per galaxy. The H  i  content of a group depends on its morphological make‐up, with those groups dominated by early‐type galaxies containing the least total H  i . We determined the expected H  i  for the spiral galaxies in the groups, and found that a number of the galaxies were H  i  deficient. The H  i  deficient spirals were found both in groups with and without a hot intragroup medium. The H  i  deficient galaxies were not necessarily found at the centre of the groups, however, we did find that two‐thirds of H  i  deficient galaxies were found within about 1 Mpc from the group centre, indicating that the group environment is affecting the gas loss from these galaxies. We determined the H  i  mass function for a composite sample of 15 groups, and found that it is significantly flatter than the field H  i  mass function. We also find a lack of high H  i  mass galaxies in groups. One possible cause of this effect is the tidal stripping of H  i  gas from spiral galaxies as they are pre‐processed in groups.

Southern GEMS groups – II. H i distribution, mass functions and H i deficient galaxies ★