WALLABY Pilot Survey: H i gas kinematics of galaxy pairs in cluster environment

Author:

Kim Shin-Jeong1ORCID,Oh Se-Heon12ORCID,Wang Jing3,Staveley-Smith Lister4ORCID,Koribalski Bärbel S56ORCID,Kim Minsu2,Park Hye-Jin7ORCID,Kim Shinna1ORCID,Spekkens Kristine8,Westmeier Tobias4ORCID,Wong O Ivy4910ORCID,Meurer Gerhardt R4,Kamphuis. Peter11,Catinella Barbara410ORCID,McQuinn Kristen B W12,Bigiel Frank13,Holwerda Benne W14ORCID,Rhee Jonghwan410,Lee-Waddell Karen49ORCID,Deg Nathan15ORCID,Verdes-Montenegro Lourdes16,For Bi-Qing410ORCID,Madrid Juan P17,Dénes Helga18ORCID,Elagali Ahmed19

Affiliation:

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

2. Department of Astronomy and Space Science, Sejong University , 209 Neungdong-ro, Gwangjin-gu, Seoul, Republic of Korea

3. Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871, People’s Republic of China

4. ICRAR, The University of Western Australia , 35 Stirling Highway, Crawley WA 6009, Australia

5. CSIRO Astronomy and Space Science, Australia Telescope National Facility , PO Box 76, NSW 1710, Australia

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

7. Research School of Astronomy and Astrophysics, Australian National University , Cotter Road, Weston Creek, ACT 2611, Australia

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

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

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

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

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

13. Argelander-Institut für Astronomie, Universität Bonn , Auf dem Hügel 71, D-53121 Bonn, Germany

14. Department of Physics and Astronomy, University of Louisville , Natural Science Building 102, Louisville, KY 40292, USA

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

16. Instituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de la Astronomía , E-18008 Granada, Spain

17. Department of Physics and Astronomy, The University of Texas Rio Grande Valley , Brownsville, TX 78520, USA

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

19. Telethon Kids Institute, Perth Children’s Hospital , Nedlands WA 6909, Australia

Abstract

ABSTRACT We examine the H i gas kinematics of galaxy pairs in two clusters and a group using Australian Square Kilometre Array Pathfinder (ASKAP) WALLABY pilot survey observations. We compare the H i properties of galaxy pair candidates in the Hydra I and Norma clusters, and the NGC 4636 group, with those of non-paired control galaxies selected in the same fields. We perform H i profile decomposition of the sample galaxies using a tool, baygaud, which allows us to deblend a line-of-sight velocity profile with an optimal number of Gaussian components. We construct H i superprofiles of the sample galaxies via stacking of their line profiles after aligning the central velocities. We fit a double Gaussian model to the superprofiles and classify them as kinematically narrow and broad components with respect to their velocity dispersions. Additionally, we investigate the gravitational instability of H i gas discs of the sample galaxies using Toomre Q parameters and H i morphological disturbances. We investigate the effect of the cluster environment on the H i properties of galaxy pairs by dividing the cluster environment into three subcluster regions (i.e. outskirts, infalling, and central regions). We find that the denser cluster environment (i.e. infalling and central regions) is likely to impact the H i gas properties of galaxies in a way of decreasing the amplitude of the kinematically narrow H i gas ($M_{\rm {narrow}}^{\rm {H\, \small {\rm I}}}$/$M_{\rm {total}}^{\rm {H\, \small {\rm I}}}$), and increasing the Toomre Q values of the infalling and central galaxies. This tendency is likely to be more enhanced for galaxy pairs in the cluster environment.

Funder

National Research Foundation of Korea

Australian Research Council

European Research Council

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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. Characterizing cool, neutral gas, and ionized metals in the outskirts of low-z galaxy clusters;Monthly Notices of the Royal Astronomical Society;2023-11-08

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