ALMA/ACA CO Survey of the IC 1459 and NGC 4636 Groups: Environmental Effects on the Molecular Gas of Group Galaxies
ALMA/ACA CO Survey of the IC 1459 and NGC 4636 Groups: Environmental Effects on the Molecular Gas of Group Galaxies
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DOI：
10.3847/1538-4365/ac7eba
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发表时间：
2022-04
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通讯作者：
Bumhyun Lee;Jing Wang;A. Chung;L. Ho;Ran Wang;T. Michiyama;J. Molina;Yongjung Kim;L. Shao;V. Kilborn;Shun Wang;Xuchen Lin;Dawoon E. Kim;B. Catinella;L. Cortese;N. Deg;H. Denes;A. Elagali;B. For;D. Kleiner;B. Koribalski;K. Lee-Waddell;J. Rhee;K. Spekkens;T. Westmeier;O. I. Wong;F. Bigiel;A. Bosma;B. Holwerda;J. M. van der Hulst;S. Roychowdhury;L. Verdes-Montenegro;M. Zwaan
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作者：
Bumhyun Lee;Jing Wang;A. Chung;L. Ho;Ran Wang;T. Michiyama;J. Molina;Yongjung Kim;L. Shao;V. Kilborn;Shun Wang;Xuchen Lin;Dawoon E. Kim;B. Catinella;L. Cortese;N. Deg;H. Denes;A. Elagali;B. For;D. Kleiner;B. Koribalski;K. Lee-Waddell;J. Rhee;K. Spekkens;T. Westmeier;O. I. Wong;F. Bigiel;A. Bosma;B. Holwerda;J. M. van der Hulst;S. Roychowdhury;L. Verdes-Montenegro;M. Zwaan
利用阿塔卡马紧凑型阵列（ACA）对IC 1459和NGC 4636星系群中的31个H i星系进行了12 CO（J = 1-0）成像观测。这是第一次对松散星系群进行CO成像调查。我们获得了良好的解析CO数据（10.7 -1.5千秒差距），共16个星系在两种环境。通过比较ACA CO数据与H i和UV数据，探讨了星系团环境对冷气体成分（CO和H i气体）和星星形成活动的影响。我们发现，CO和/或H i形态在我们的组成员中受到干扰，其中一些显示出高度不对称的CO分布（例如，IC 5264、NGC 7421和NGC 7418）。与xCOLD GASS样本中的孤立星系相比，我们的星系团星系往往具有低星星形成率和低H2气体分数。我们的研究结果表明，星系群环境可以改变冷气体成分的分布，包括分子气体和星系的星星形成性质。这支持了在类星系环境中的预处理在星系演化中发挥重要作用的证据。
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.