HI debris in the IC 1459 galaxy group

Abstract

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.

References in corpus (7)

• A Search for Extended Ultraviolet Disk (XUV-disk) Galaxies in the Local Universe
• The Australian Square Kilometre Array Pathfinder: System Architecture and Specifications of the Boolardy Engineering Test Array
• The Local Universe as Seen in Far-Infrared and in Far-Ultraviolet: A Global Point of View on the Local Recent Star Formation
• New HI scaling relations to probe the HI content of galaxies via global HI-deficiency maps
• Southern GEMS Groups I: Dynamical Properties
• HI imaging of galaxies in X-ray bright groups
• The multi-frequency parsec-scale structure of PKS 2254-367 (IC 1459): a luminosity-dependent break in morphology for the precursors of radio galaxies?

Cited by in corpus (6)

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• Unravelling the Origin of the Counter-Rotating Core in IC 1459 with KMOS and MUSE
• MeerKAT-64 discovers wide-spread tidal debris in the nearby NGC 7232 galaxy group
• MIGHTEE-HI: Discovery of an HI-rich galaxy group at z = 0.044 with MeerKAT
• Neutral Hydrogen in Nearby Dwarf Galaxies