WALLABY pilot survey: an ‘almost’ dark cloud near the Hydra cluster

Author:

O’Beirne T12ORCID,Staveley-Smith L12ORCID,Wong O I123ORCID,Westmeier T12ORCID,Batten G4,Kilborn V A4,Lee-Waddell K135ORCID,Mancera Piña P E6ORCID,Román J78ORCID,Verdes-Montenegro L9,Catinella B12ORCID,Cortese L12ORCID,Deg N10ORCID,Dénes H11ORCID,For B Q12ORCID,Kamphuis P12,Koribalski B S1314ORCID,Murugeshan C23,Rhee J1,Spekkens K15,Wang J16,Bekki K1,Lṕpez-Sánchez Á R21718ORCID

Affiliation:

1. International Centre for Radio Astronomy Research (ICRAR), The University of Western Australia , 35 Stirling Highway, Crawley, WA 6009 , Australia

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

3. CSIRO Space & Astronomy , PO Box 1130, Bentley, WA 6102 , Australia

4. Centre for Astrophysics and Supercomputing, Swinburne University of Technology , Hawthorn, Victoria 3122 , Australia

5. International Centre for Radio Astronomy Research (ICRAR), Curtin University , Bentley, WA 6102 , Australia

6. Leiden Observatory, Leiden University , PO Box 9513, NL-2300 RA Leiden , The Netherlands

7. Kapteyn Astronomical Institute, University of Groningen , PO Box 800, NL-9700 AV Groningen , The Netherlands

8. Departamento de Astrofísica, Universidad de La Laguna , E-38206, La Laguna, Tenerife , Spain

9. Instituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de la Astronomía s/n, 18008 Granada, Spain

10. Department of Physics, Engineering Physics, and Astronomy, Queen’s University , Kingston, ON, K7L 3N6 , Canada

11. School of Physical Sciences and Nanotechnology, Yachay Tech University , Hacienda San José S/N, 100119 Urcuquí , Ecuador

12. Faculty of Physics and Astronomy, Astronomical Institute (AIRUB) , Ruhr University Bochum, D-44780 Bochum , Germany

13. CSIRO Space & Astronomy, Australia Telescope National Facility , PO Box 76, NSW 1710 , Australia

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

15. Department of Physics and Space Science, Royal Military College of Canada , PO Box 17000, Station Forces, Kingston, ON K7K 7B4 , Canada

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

17. School of Mathematical and Physical Sciences, Macquarie University , NSW 2109 , Australia

18. Research Centre for Astrophysics and Space Technologies , Macquarie University, NSW 2109 , Australia

Abstract

ABSTRACT We explore the properties of an ‘almost’ dark cloud of neutral hydrogen (H i) using data from the Widefield ASKAP L-band Legacy All-sky Survey (WALLABY). Until recently, WALLABY J103508 − 283427 (also known as H1032 − 2819 or LEDA 2793457) was not known to have an optical counterpart, but we have identified an extremely faint optical counterpart in the Dark Energy Spectroscopic Instrument (DESI) Legacy Imaging Survey Data Release 10. We measured the mean g-band surface brightness to be 27.0 ± 0.3 mag arcsec−2. The WALLABY data revealed the cloud to be closely associated with the interacting group Klemola 13 (also known as HIPASS J1034 − 28 and the Tol 9 group), which itself is associated with the Hydra cluster. In addition to WALLABY J103508 − 283427/H1032 − 2819, Klemola 13 contains 10 known significant galaxies and almost half of the total H i gas is beyond the optical limits of the galaxies. By combining the new WALLABY data with archival data from the Australia Telescope Compact Array, we investigate the H i distribution and kinematics of the system. We discuss the relative role of tidal interactions and ram pressure stripping in the formation of the cloud and the evolution of the system. The ease of detection of this cloud and intragroup gas is due to the sensitivity, resolution, and wide field of view of WALLABY, and showcases the potential of the full WALLABY survey to detect many more examples.

Funder

Australian Government

Government of Western Australia

Science and Industry Endowment Fund

CSIRO

Australian Research Council

National Science Foundation

Chinese Academy of Sciences

National Natural Science Foundation of China

National Aeronautics and Space Administration

NWO

Natural Sciences and Engineering Research Council of Canada

BMBF

Publisher

Oxford University Press (OUP)

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. A Catalogue and analysis of ultra-diffuse galaxy spectroscopic properties;Monthly Notices of the Royal Astronomical Society;2024-05-13

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