Year: 2022
Type: article
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.
Authors: Shin-Jeong Kim, Se-Heon Oh, Jing Wang, Lister Staveley-Smith, Bärbel S Koribalski, Minsu Kim, Hye-Jin Park, Shinna Kim, Kristine Spekkens, Tobias Westmeier, O Ivy Wong, Gerhardt R Meurer, Peter Kamphuis., Barbara Catinella, Kristen B W McQuinn, Frank Bigiel, Benne W Holwerda, Jonghwan Rhee, Karen Lee-Waddell, Nathan Deg, Lourdes Verdes-Montenegro, Bi-Qing For, Juan P Madrid, Helga Dénes, Ahmed Elagali
Institutions: Sejong University, Peking University, The University of Western Australia, International Centre for Radio Astronomy Research, Commonwealth Scientific and Industrial Research Organisation, Australia Telescope National Facility, Western Sydney University, Australian National University, Royal Military College of Canada, ASTRO-3D, ARC Centre of Excellence for All-sky Astrophysics, Ruhr University Bochum, Rutgers, The State University of New Jersey, University of Bonn, University of Louisville, Queen's University, Instituto de Astrofísica de Andalucía, The University of Texas Rio Grande Valley, Netherlands Institute for Radio Astronomy, The Kids Research Institute Australia, Princess Margaret Hospital for Children, Perth Children's Hospital
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Awards: Verbundprojekt 05A2017 - D-MeerKAT: Ein deutscher Beitrag zur Weiterentwicklung der Radioastronomie im Zentimeterwellenlängenbereich.Teilprojekt 3, G4177538671, G434337789, ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions, Galaxy Evolution in the ALMA Era - The Baryon Cycle and Star Formation in Nearby Galaxies, G7390005016
OpenAlex ID: W4310102504