ALMA/ACA CO Survey of the IC 1459 and NGC 4636 Groups: Environmental Effects on the Molecular Gas of Group Galaxies - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles The Astrophysical Journal Supplement Series Year : 2022

ALMA/ACA CO Survey of the IC 1459 and NGC 4636 Groups: Environmental Effects on the Molecular Gas of Group Galaxies

Bumhyun Lee
  • Function : Author
Jing Wang
  • Function : Author
Aeree Chung
  • Function : Author
Luis C. Ho
  • Function : Author
Ran Wang
  • Function : Author
Tomonari Michiyama
  • Function : Author
Juan Molina
  • Function : Author
Yongjung Kim
  • Function : Author
Li Shao
  • Function : Author
Virginia Kilborn
  • Function : Author
Shun Wang
  • Function : Author
Xuchen Lin
  • Function : Author
Dawoon E. Kim
  • Function : Author
Barbara Catinella
  • Function : Author
Luca Cortese
  • Function : Author
Nathan Deg
  • Function : Author
Helga Denes
  • Function : Author
Ahmed Elagali
  • Function : Author
Bi-Qing For
  • Function : Author
Dane Kleiner
  • Function : Author
Bärbel S. Koribalski
  • Function : Author
Karen Lee-Waddell
  • Function : Author
Jonghwan Rhee
  • Function : Author
Kristine Spekkens
  • Function : Author
Tobias Westmeier
  • Function : Author
O. Ivy Wong
  • Function : Author
Frank Bigiel
  • Function : Author
Benne W. Holwerda
  • Function : Author
Jan M. van der Hulst
  • Function : Author
Sambit Roychowdhury
  • Function : Author
Lourdes Verdes-Montenegro
  • Function : Author
Martin A. Zwaan
  • Function : Author

Abstract

We present new results of a 12CO(J = 1-0) imaging survey using the Atacama Compact Array (ACA) for 31 H I detected galaxies in the IC 1459 and NGC 4636 groups. This is the first CO imaging survey for loose galaxy groups. We obtained well-resolved CO data (~0.7-1.5 kpc) for a total of 16 galaxies in two environments. By comparing our ACA CO data with the H I and UV data, we probe the impacts of the group environment on the cold gas components (CO and H I gas) and star formation activity. We find that CO and/or H I morphologies are disturbed in our group members, some of which show highly asymmetric CO distributions (e.g., IC 5264, NGC 7421, and NGC 7418). In comparison with isolated galaxies in the xCOLD GASS sample, our group galaxies tend to have low star formation rates and low H2 gas fractions. Our findings suggest that the group environment can change the distribution of cold gas components, including the molecular gas and star formation properties of galaxies. This is supporting evidence that preprocessing in the group-like environment can play an important role in galaxy evolution.
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insu-03780743 , version 1 (19-09-2022)

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Bumhyun Lee, Jing Wang, Aeree Chung, Luis C. Ho, Ran Wang, et al.. ALMA/ACA CO Survey of the IC 1459 and NGC 4636 Groups: Environmental Effects on the Molecular Gas of Group Galaxies. The Astrophysical Journal Supplement Series, 2022, 262, ⟨10.3847/1538-4365/ac7eba⟩. ⟨insu-03780743⟩
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