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arXiv 2006.10053astro-ph.GA
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星系吸积过程中环境对$z \sim 0.9$星系团中恒星形成星系的影响

Environmental impact on star-forming galaxies in a $z \sim 0.9$ cluster during course of galaxy accretion

Tetsuro Asano, Tadayuki Kodama, Kentaro Motohara, Lori Lubin, Brian C. Lemaux, Roy Gal, Adam Tomczak, Dale Kocevski, Masao Hayashi, Yusei Koyama, Ichi Tanaka, T… 展开作者

Tetsuro Asano, Tadayuki Kodama, Kentaro Motohara, Lori Lubin, Brian C. Lemaux, Roy Gal, Adam Tomczak, Dale Kocevski, Masao Hayashi, Yusei Koyama, Ichi Tanaka, Tomoko L. Suzuki, Naoaki Yamamoto, Daiki Kimura, Masahiro Konishi, Hidenori Takahashi, Yasunori Terao, Kosuke Kushibiki, Yukihiro Kono, Yuzuru Yoshii, the SWIMS team

摘要:

星系团在聚集成团时会改变它们的性质。为了理解这背后的物理学,我们需要回到过去,直接观察星系落入星系团时发生的事情。我们使用斯巴鲁望远镜上安装的新红外仪器SWIMS对位于$z=0.923$的CL1604-D星团进行了窄带和$J$-波段成像巡天。窄带滤光片NB 1261与来自$z=0.923$的星团的H $α$发射相匹配。结合各种调查的广泛现有数据,我们非常详细地研究了这个星系团及其周围的星系特性。我们已经确定了与该簇相关的27个H $α$发射体。它们与MIPS 24 $μ$ m源有明显的重叠,并且在静止框架$UVJ$图上只位于恒星形成区。在二维空间分布和相空间图中,我们识别出了两组靠近星系团的星系,它们很可能是落入星系团主体的。我们比较了恒星形成星系的各种物理性质,如特定的恒星形成率(爆发)和形态(合并)作为环境的函数;集群中心,老年组,年轻组和领域。因此,一个关于星系性质如何在它们聚集成一个更密集的区域时发生变化的全球图片已经出现。这包括合并的发生,恒星形成活动的增强,到尘埃星爆阶段的漂移,以及最终淬火到被动阶段。

英文摘要:

Galaxies change their properties as they assemble into clusters. In order to understand the physics behind that, we need to go back in time and observe directly what is occurring in galaxies as they fall into a cluster. We have conducted a narrow-band and $J$-band imaging survey on a cluster CL1604-D at $z=0.923$ using a new infrared instrument SWIMS installed at the Subaru Telescope. The narrow-band filter, NB1261, matches to H$α$ emission from the cluster at $z=0.923$. Combined with a wide range of existing data from various surveys, we have investigated galaxy properties in and around this cluster in great detail. We have identified 27 H$α$ emitters associated with the cluster. They have significant overlap with MIPS 24$μ$m sources and are located exclusively in the star forming regime on the rest-frame $UVJ$ diagram. We have identified two groups of galaxies near the cluster in the 2D spatial distribution and the phase-space diagram, which are likely to be in-falling to the cluster main body. We have compared various physical properties of star forming galaxies, such as specific star formation rates (burstiness) and morphologies (merger) as a function of environment; cluster center, older group, younger group, and the field. As a result, a global picture has emerged on how the galaxy properties are altered as they assemble into a denser region. This includes the occurrence of mergers, enhancement of star formation activity, excursion to the dusty starburst phase, and eventual quenching to a passive phase.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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