TY - JOUR
T1 - ALMA/ACA CO survey of the IC 1459 and NGC 4636 groups : environmental effects on the molecular gas of group galaxies
AU - Lee, Bumhyun
AU - Wang, Jing
AU - Chung, Aeree
AU - Ho, Luis C.
AU - Wang, Ran
AU - Michiyama, Tomonari
AU - Molina, Juan
AU - Kim, Yongjung
AU - Shao, Li
AU - Kilborn, Virginia
AU - Wang, Shun
AU - Lin, Xuchen
AU - Kim, Dawoon E.
AU - Catinella, Barbara
AU - Cortese, Luca
AU - Deg, Nathan
AU - Denes, Helga
AU - Elagali, Ahmed
AU - For, Bi-Qing
AU - Kleiner, Dane
AU - Koribalski, Bärbel S.
AU - Lee-Waddell, Karen
AU - Rhee, Jonghwan
AU - Spekkens, Kristine
AU - Westmeier, Tobias
AU - Wong, O. Ivy
AU - Bigiel, Frank
AU - Bosma, Albert
AU - Holwerda, Benne W.
AU - van der Hulst, Jan M.
AU - Roychowdhury, Sambit
AU - Verdes-Montenegro, Lourdes
AU - Zwaan, Martin A.
PY - 2022
Y1 - 2022
N2 - 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.
AB - 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.
UR - https://hdl.handle.net/1959.7/uws:70428
U2 - 10.3847/1538-4365/ac7eba
DO - 10.3847/1538-4365/ac7eba
M3 - Article
SN - 0067-0049
VL - 262
JO - Astrophysical Journal Supplement Series
JF - Astrophysical Journal Supplement Series
IS - 1
M1 - 31
ER -