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The Impact of the Group Environment on the Molecular Gas and Star Formation Activity

Published online by Cambridge University Press:  09 June 2023

Bumhyun Lee Open the ORCID record for Bumhyun Lee [Opens in a new window] ,
Jing Wang ,
Aeree Chung ,
Luis C. Ho ,
Juan Molina ,
Yongjung Kim ,
Shun Wang ,
Bi-Qing For ,
Bärbel S. Koribalski Open the ORCID record for Bärbel S. Koribalski [Opens in a new window]  and
Kristine Spekkens
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Bumhyun Lee
Affiliation:
Korea Astronomy and Space Science Institute, 776 Daedeokdae-ro, Daejeon 34055, Republic of Korea bhlee301@gmail.com Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People’s Republic of China Department of Astronomy, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
Jing Wang
Affiliation:
Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People’s Republic of China
Aeree Chung
Affiliation:
Department of Astronomy, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
Luis C. Ho
Affiliation:
Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People’s Republic of China Department of Astronomy, School of Physics, Peking University, Beijing 100871, People’s Republic of China
Juan Molina
Affiliation:
Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People’s Republic of China Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, 439 92 Onsala, Sweden
Yongjung Kim
Affiliation:
Department of Astronomy and Atmospheric Sciences, College of Natural Sciences, Kyungpook National University, Daegu 41566, Republic of Korea
Shun Wang
Affiliation:
Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People’s Republic of China Department of Astronomy, School of Physics, Peking University, Beijing 100871, People’s Republic of China
Bi-Qing For
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), The University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia ARC Centre of Excellence for All-Sky Astrophysics in 3 Dimensions (ASTRO 3D), Australia
Bärbel S. Koribalski
Affiliation:
CSIRO Space and Astronomy, Australia Telescope National Facility, P.O. Box 76, NSW 1710, Australia School of Science, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia
Kristine Spekkens
Affiliation:
Royal Military College of Canada, PO Box 17000, Station Forces, Kingston, Ontario, K7K7B4, Canada
Albert Bosma
Affiliation:
Aix Marseille Univ, CNRS, CNES, LAM, Marseille, France
Benne W. Holwerda
Affiliation:
University of Louisville, Department of Physics and Astronomy, 102 Natural Science Building, 40292 KY Louisville, USA
Lourdes Verdes-Montenegro
Affiliation:
Instituto de Astrofísica de Andalucía (CSIC), Spain
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Abstract

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At least half of the local galaxies reside in galaxy groups, which indicates that the group is the common environment where galaxies evolve. Therefore, it is important to probe how significantly galaxies are affected by group environmental processes, in order to obtain a better understanding of galaxy evolution. We carried out a new CO imaging survey for 31 galaxies in the IC 1459 and NGC 4636 groups, using the Atacama Compact Array, to study the effect of the group environment on the molecular gas properties and the star formation activity. With our resolved CO data, combined with high-resolution H i images, we find asymmetric CO and H i distributions in the group galaxies. Compared to isolated galaxies, group members have relatively low molecular gas fraction and low star formation rate. These results suggest that the group environment can change the properties of cold gas components and star formation in group galaxies.

Keywords

Molecular gasGalaxiesGalaxy groupsGalaxy evolution
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 17 , Symposium S373: Resolving the Rise and Fall of Star Formation in Galaxies , August 2021 , pp. 136 - 139
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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