Abstract
We have conducted a wide-field neutral hydrogen (HI) survey of 16 galaxy groups, as part of the Group Evolution Multiwavelength Study (GEMS). We found 204 HI detections in the sixteen groups, and of these, 10 were previously uncatalogued, and 11 were in optical catalogues, but had no redshifts. We find that >98% of the neutral hydrogen mass we detect is associated with galaxies. The majority of our HI detections could be matched with an optically visible galaxy, however in the NGC 3783 galaxy group we find an HI cloud that appears to have no stellar emission associated with it. The origin and nature of this HI cloud is unclear. We look at the properties of all the groups combined, and find that the HI content of a galaxy group depends on its X-ray properties, such that those groups with extended X-ray emission tend to have less HI than those with no X-ray emission.
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