WALLABY Pre-Pilot Survey: HI Content of the Eridanus Supergroup

Abstract

We present observations of the Eridanus supergroup obtained with the Australian Square Kilometre Array Pathfinder (ASKAP) as part of the pre-pilot survey for the Widefield ASKAP L-band Legacy All-sky Blind Survey (WALLABY). The total number of detected HI sources is 55, of which 12 are background galaxies not associated with the Eridanus supergroup. Two massive HI clouds are identified and large HI debris fields are seen in the NGC 1359 interacting galaxy pair, and the face-on spiral galaxy NGC 1385. We describe the data products from the source finding algorithm and present the basic parameters. The presence of distorted HI morphology in all detected galaxies suggests ongoing tidal interactions within the subgroups. The Eridanus group has a large fraction of HI deficient galaxies as compared to previously studied galaxy groups. These HI deficient galaxies are not found at the centre of the group. We find that galaxies in the Eridanus supergroup do not follow the general trend of the atomic gas fraction versus stellar mass scaling relation, which indicates that the scaling relation changes with environmental density. In general, the majority of these galaxies are actively forming stars.

20 pages, 14 Figures, 5 Tables. Accepted by MNRAS. Supplementary material is published online

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Cited by in corpus (14)

• WALLABY Pre-Pilot Survey: The effects of tidal interaction on radial distribution of color in galaxies of the Eridanus supergroup
• ALMA/ACA CO Survey of the IC 1459 and NGC 4636 Groups: Environmental Effects on the Molecular Gas of Group Galaxies
• WALLABY Pre-Pilot and Pilot Survey: the Tully Fisher Relation in Eridanus, Hydra, Norma and NGC4636 fields
• FAST-ASKAP Synergy: Quantifying Coexistent Tidal and Ram Pressure Strippings in the NGC 4636 Group
• The CMB Cold Spot as predicted by foregrounds around nearby galaxies
• WALLABY Pre-Pilot Survey: The effects of angular momentum and environment on the HI gas and star formation properties of galaxies in the Eridanus supergroup
• The SAMI Galaxy Survey: Using concentrated star-formation and stellar population ages to understand environmental quenching
• A serendipitous discovery of HI-rich galaxy groups with MeerKAT
• Star formation concentration as a tracer of environmental quenching in action: a study of the Eagle and C-Eagle simulations
• The technological and scientific development of ASKAP
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• Recent Developments on the HI Gas of Low-Redshift Galaxies Seen by the 21cm Emission Lines