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We report on the results from deep HI observations, performed with the KarooArray Telescope and with the Karl G. Jansky Very Large Array of the loosegalaxy group centred on the early-type galaxy IC 1459. The main result from ourobservations is the detection of a nearly continuous, 500-kpc long HI tailwhich crosses the entire group. Earlier observations with the AustraliaTelescope Compact Array had shown the presence of a large HI tail in thisgalaxy group, but because of the much larger coverage of the new data, the fullextent of this tail is now visible. The HI mass of this structure is 3.1 +- 0.310^9 Msun . Based on its morphology and kinematics, we conclude that the tailconsists of gas stripped from NGC 7418 through tidal interactions, withram-pressure affects playing at most a minor role. Optical images of the IC1459 group do not show many indications that galaxy interactions are common inthis group. The HI data reveal a very different picture and show that almostall gas-rich galaxies in the IC 1459 group have a distorted HI distributionindicating that many interactions are occurring in this group. This high numberof interactions shows that the processes that drive galaxy transformation arealso occurring in fairly loose galaxy groups.

Galaxy interactions in loose galaxy groups: KAT-7 and VLA HI Observations of the IC 1459 group