The nature of Hα-selected galaxies along the large-scale structure at z=0.4 revealed by Subaru Hyper Suprime-Cam survey
The nature of Hα-selected galaxies along the large-scale structure at z=0.4 revealed by Subaru Hyper Suprime-Cam survey
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Subaru Hyper Suprime-Cam 巡天揭示了 z=0.4 处大尺度结构中 Hα 选择星系的性质
DOI：
10.1093/pasj/psx078
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发表时间：
2017
影响因子：
2.3
通讯作者：
Komiyama Yutaka
中科院分区：
文献类型：
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作者：
Koyama Yusei;Hayashi Masao;Tanaka Masayuki;Kodama Tadayuki;Shimakawa Rhythm;Yamamoto Moegi;Nakata Fumiaki;Tanaka Ichi;Suzuki Tomoko L;Tadaki Ken-ichi;Nishizawa Atsushi J;Yabe Kiyoto;Toba Yoshiki;Lin Lihwai;Jian Hung-Yu;Komiyama Yutaka
我们提出的颜色，恒星质量，和星星形成（SF）活动的环境依赖性的Hα选择星系沿着大尺度结构atz= 0.4托管在深2 -3领域的孪生星系团，发现的斯巴鲁战略计划的超Suprime-Cam（HSC SSP）。通过结合照片z选择星系和Hα发射体与HSC SSP（DR 1）最近发布的宽带和窄带（NB）数据，我们证实了高密度环境中的星系或星系团中心区域的星系显示出更红的颜色。我们发现，仍然存在一个可能的颜色密度和颜色半径的相关性，即使我们限制样本的Hα选择的星系，可能是由于存在大量的Hα发射在较密集的区域。我们还发现，在Hα发射体中，朝向最高密度环境的星星形成率（SFR）有所增加，这也主要是由高密度环境中过量的红色/大质量Hα发射体驱动的，而它们的特定SFR并不随环境而显著变化。这项工作展示了HSC SSP NB数据在遥远宇宙环境中研究SF星系的能力。
We present the environmental dependence of color, stellar mass, and star formation (SF) activity in Hα-selected galaxies along the large-scale structure atz= 0.4 hosting twin clusters in the DEEP2-3 field, discovered by the Subaru Strategic Program of Hyper Suprime-Cam (HSC SSP). By combining photo-z-selected galaxies and Hα emitters selected with broadband and narrowband (NB) data from the recent data release of HSC SSP (DR1), we confirm that galaxies in higher-density environments or galaxies in cluster central regions show redder colors. We find that there still remains a possible color–density and color–radius correlation even if we restrict the sample to Hα-selected galaxies, probably due to the presence of massive Hα emitters in denser regions. We also find a hint of increased star formation rates (SFR) amongst Hα emitters toward the highest-density environment, again primarily driven by the excess of red/massive Hα emitters in high-density environments, while their specific SFRs do not significantly change with environment. This work demonstrates the power of the HSC SSP NB data for studying SF galaxies across environments in the distant universe.