WALLABY pilot survey: H i gas disc truncation and star formation of galaxies falling into the Hydra I cluster-Reference-Cited by-同舟云学术

WALLABY pilot survey: H i gas disc truncation and star formation of galaxies falling into the Hydra I cluster

Published:2021-12-04 Issue:2 Volume:510 Page:1716-1732
ISSN:0035-8711
Container-title:Monthly Notices of the Royal Astronomical Society
language:en
Short-container-title:

Author:

Reynolds T N¹²^ORCID,Catinella B¹²^ORCID,Cortese L¹²^ORCID,Westmeier T¹²^ORCID,Meurer G R¹,Shao L³^ORCID,Obreschkow D¹²^ORCID,Román J⁴⁵,Verdes-Montenegro L⁶,Deg N⁷^ORCID,Dénes H⁸^ORCID,For B-Q¹²^ORCID,Kleiner D⁹^ORCID,Koribalski B S¹⁰¹¹^ORCID,Lee-Waddell K¹¹²^ORCID,Murugeshan C²¹²,Oh S-H¹³,Rhee J¹²^ORCID,Spekkens K¹⁴,Staveley-Smith L¹²^ORCID,Stevens A R H¹²^ORCID,van der Hulst J M¹⁵,Wang J¹⁶,Wong O I¹²¹²^ORCID,Holwerda B W¹⁷^ORCID,Bosma A¹⁸^ORCID,Madrid J P¹⁹,Bekki K¹

Affiliation:

1. International Centre for Radio Astronomy Research (ICRAR), The 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), Australia

3. National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100107, China

4. Instituto de Astrofísica de Canarias, c/ Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain

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

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

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

8. ASTRON - The Netherlands Institute for Radio Astronomy, NL-7991 PD Dwingeloo, the Netherlands

9. INAF - Osservatorio Astronomico di Cagliari, Via della Scienza 5, I-09047 Selargius, Cagliari, Italy

10. CSIRO Astronomy and Space Science, Australia Telescope National Facility, P.O. Box 76, Epping, NSW 1710, Australia

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

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

13. Department of Physics and Astronomy, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul, Republic of Korea

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

15. Kapteyn Astronomical Institute, University of Groningen, Landleven 12, NL-9747AD Groningen, the Netherlands

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

17. Department of Physics and Astronomy, University of Louisville, Louisville, KY 40292, USA

18. Aix Marseille Univ., CNRS, CNES, LAM, Marseille 13013, France

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

Abstract

ABSTRACT We present results from our analysis of the Hydra I cluster observed in neutral atomic hydrogen (H i) as part of the Widefield ASKAP L-band Legacy All-sky Blind Survey (WALLABY). These WALLABY observations cover a 60-square-degree field of view with uniform sensitivity and a spatial resolution of 30 arcsec. We use these wide-field observations to investigate the effect of galaxy environment on H i gas removal and star formation quenching by comparing the properties of cluster, infall, and field galaxies extending up to ∼5R200 from the cluster centre. We find a sharp decrease in the H i-detected fraction of infalling galaxies at a projected distance of ∼1.5R200 from the cluster centre from $\sim 85{{\ \rm per\ cent}}$ to $\sim 35{{\ \rm per\ cent}}$. We see evidence for the environment removing gas from the outskirts of H i-detected cluster and infall galaxies through the decrease in the H i to r-band optical disc diameter ratio. These galaxies lie on the star-forming main sequence, indicating that gas removal is not yet affecting the inner star-forming discs and is limited to the galaxy outskirts. Although we do not detect galaxies undergoing galaxy-wide quenching, we do observe a reduction in recent star formation in the outer disc of cluster galaxies, which is likely due to the smaller gas reservoirs present beyond the optical radius in these galaxies. Stacking of H i non-detections with H i masses below $M_{\rm {HI}}\lesssim 10^{8.4}\, \rm {M}_{\odot }$ will be required to probe the H i of galaxies undergoing quenching at distances ≳60 Mpc with WALLABY.

Funder

Australian Research Council

Spanish Ministry of Science and Innovation

National Research Foundation of Korea

European Research Council

University of Hawaii

Johns Hopkins University

Durham University

University of Edinburgh

Harvard-Smithsonian Center for Astrophysics

Space Telescope Science Institute

National Aeronautics and Space Administration