HI debris in the IC 1459 galaxy group
  We present HI synthesis imaging of the giant elliptical galaxy IC 1459 and
its surroundings with the Australia Telescope Compact Array (ATCA). Our search
for extended HI emission revealed a large complex of HI clouds near IC 1459,
likely the debris from tidal interactions with neighbouring galaxies. The total
HI mass ($\sim 10^9$\Msun) in the detected clouds spans 250 kpc from the
north-east of the gas-rich spiral NGC 7418A to the south-east of IC 1459. The
extent and mass of the HI debris, which shows rather irregular morphology and
kinematics, are similar to those in other nearby groups. Together with HI
clouds recently detected near two other IC 1459 group members, namely IC 5270
and NGC 7418, using Phased-Array Feeds (PAFs) on the Australian Square
Kilometer Array Pathfinder (ASKAP), the detected debris make up a significant
fraction of the group's intergalactic medium.
