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arXiv 2005.04894astro-ph.GA
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不同环境下绿谷星系的红移演化

Redshift Evolution of Green Valley Galaxies in Different Environments from the Hyper Suprime-Cam Survey

Hung-Yu Jian, Lihwai Lin, Yusei Koyama, Ichi Tanaka, Keiichi Umetsu, Bau-Ching Hsieh, Yuichi Higuchi, Masamune Oguri, Surhud More, Yutaka Komiyama, Tadayuki Kod… 展开作者

Hung-Yu Jian, Lihwai Lin, Yusei Koyama, Ichi Tanaka, Keiichi Umetsu, Bau-Ching Hsieh, Yuichi Higuchi, Masamune Oguri, Surhud More, Yutaka Komiyama, Tadayuki Kodama, Atsushi J. Nishizawa, Yu-Yen Chang

摘要:

绿谷星系代表了可能从恒星形成阶段过渡到静止阶段的星系群。为了研究环境在淬灭恒星形成中的作用,我们使用Hyper Suprime-Cam Strategic Subaru Proposal调查的宽场数据来量化不同环境中绿谷星系的频率及其红移演化。我们发现,绿谷分数,一般来说,是小于20%的任何红移和环境。绿谷分数,当归一化到总人口,是在外地高于集团或集群,并减少减少红移和增加质量。在致密环境中,过渡星系的低比例可能是缺乏恒星形成星系的结果,这些星系可能是绿谷星系的祖先。为了评估环境对恒星形成淬灭的影响,我们定义有效的绿谷分数为绿谷星系的数量与非静止星系的数量之比。场星系的有效绿谷分数低于群星系或团星系,这表明场星系具有较强的正质量依赖性和较弱的红移演化。此外,在组或簇中,比星形成率(sSFR)降低0.1- 0.3dex。因此,我们的研究结果意味着,一个正在进行的缓慢淬火过程已经在稠密的环境中,因为z~1。

英文摘要:

Green valley galaxies represent the population that is likely to transition from the star-forming to the quiescent phases. To investigate the role of the environment in quenching star formation, we use the wide-field data from the Hyper Suprime-Cam Strategic Subaru Proposal survey to quantify the frequency of green valley galaxies in different environments and their redshift evolution. We find that the green valley fraction, in general, is less than 20% in any redshift and environment. The green valley fraction, when normalized to the total population, is higher in the field than that in groups or clusters and decreases with a decreasing redshift and increasing mass. The lower fraction of transitional galaxies in denser environments could be a consequence of the lack of star-forming galaxies, which could be the progenitors of green valley galaxies. To assess the effect of the environment on star formation quenching, we define the effective green valley fraction as the ratio of the number of green valley galaxies to that of nonquiescent galaxies only. The effective green valley fraction for field galaxies is lower than that for group or cluster galaxies, which reveals a strong positive mass dependence and mild redshift evolution. Moreover, the specific star formation rate (sSFR) is reduced by 0.1-0.3 dex in groups or clusters. Our results thus imply that an ongoing slow quenching process has been acting in the dense environment since z~1.

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