WALLABY pre-pilot survey: H i content of the Eridanus supergroup

Author:

For B-Q12ORCID,Wang J3,Westmeier T12ORCID,Wong O I412ORCID,Murugeshan C42,Staveley-Smith L12ORCID,Courtois H M5,Pomarède D6,Spekkens K7,Catinella B12ORCID,McQuinn K B W8,Elagali A9,Koribalski B S10112ORCID,Lee-Waddell K14ORCID,Madrid J P12,Popping A1,Reynolds T N12ORCID,Rhee J12,Bekki K1,Dènes H13,Kamphuis P14,Verdes-Montenegro L15

Affiliation:

1. International Centre for Radio Astronomy Research, University of Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia

2. ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)

3. Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China

4. CSIRO Space and Astronomy, PO Box 1130, Bentley, WA 6102, Australia

5. Univ Claude Bernard Lyon 1, IP2I Lyon, IUF, F-69622 Villeurbanne, France

6. Institut de Recherche sur les Lois Fondamentales de l’Univers, CEA Université Paris-Saclay, F-91191 Gif-sur-Yvette, France

7. Royal Military College of Canada, PO Box 17000, Station Forces, Kingston, ON K7K 7B4, Canada

8. Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, NJ 08854, USA

9. Telethon Kids Institute, Perth Children’s Hospital, Perth, Nedlands, WA 6009, Australia

10. CSIRO Space and Astronomy, PO Box 76, Epping, NSW 1710, Australia

11. School of Science, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia

12. The University of Texas Rio Grande Valley, One West University Blvd, Brownsville, TX 78520, USA

13. ASTRON, The Netherlands Institute for Radio Astronomy, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, the Netherlands

14. Faculty of Physics and Astronomy, Astronomical Institute, Ruhr University Bochum, D-44780 Bochum, Germany

15. Instituto de Astrofísica de Andalucía, CSIC, Glorieta de la Astronomía, E-18080 Granada, Spain

Abstract

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 H i sources is 55, of which 12 are background galaxies not associated with the Eridanus supergroup. Two massive H i clouds are identified and large H i 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 H i morphology in all detected galaxies suggests ongoing tidal interactions within the subgroups. The Eridanus group has a large fraction of H i-deficient galaxies as compared to previously studied galaxy groups. These H i-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.

Funder

ARC

BMBF

MINECO

FEDER

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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