We observed 54 Hickson Compact Groups, from which 41 were detected in the 21-cm line of HI. The total number of HCGs observed in HI increased to 75. Apart from a few HI-rich groups we find a great number of HCGs to have ratios in the expected range. However, there are many groups with extreme HI-deficiencies as compared to nearby groups and to aggregates known for HI-deficiency like the Coma I group and the Virgo cluster.
© European Southern Observatory (ESO) 1997
Online publication: April 28, 1998