The whole picture of the large-scale structure of the CL1604 supercluster at z ∼ 0.9

被引：11

作者：

Hayashi, Masao ^{[1
]}

Koyama, Yusei ^{[2
,3
]}

Kodama, Tadayuki ^{[4
]}

Komiyama, Yutaka ^{[1
]}

Lin, Yen-Ting ^{[5
]}

Miyazaki, Satoshi ^{[1
]}

Shimakawa, Rhythm ^{[2
]}

Suzuki, Tomoko L. ^{[1
,4
]}

Tanaka, Ichi ^{[2
]}

Yamamoto, Moegi ^{[3
]}

Yamamoto, Naoaki ^{[4
]}

机构：

[1] Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[2] Natl Astron Observ Japan, Subaru Telescope, 650 North Aohoku Pl, Hilo, HI 96720 USA

[3] SOKENDAI, Dept Astron Sci, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[4] Tohoku Univ, Astron Inst, Aoba Ku, Sendai, Miyagi 9808578, Japan

[5] Acad Sinica, Inst Astron & Astrophys, POB 23-141, Taipei 10617, Taiwan

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 2019年 / 71卷 / 06期

基金：

日本学术振兴会; 美国国家科学基金会;

关键词：

galaxies: clusters: general; galaxies: evolution; galaxies: groups: general; galaxies: high-redshift; galaxies: stellar content; STAR-FORMATION HISTORIES; GALAXY CLUSTERS; RED-SEQUENCE; STELLAR; EVOLUTION; DISCOVERY; SPECTROGRAPH; Z=0.9;

D O I：

10.1093/pasj/psz097

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the large-scale structure over a more than 50 comoving Mpc scale at z similar to 0.9 where the CL1604 supercluster, which is one of the largest structures ever known at high redshifts, is embedded. The wide-field deep imaging survey by the Subaru Strategic Program with the Hyper Suprime-Cam reveals that the already-known CL1604 supercluster is a mere part of larger-scale structure extending to both the north and the south. We confirm that there are galaxy clusters at three slightly different redshifts in the northern and southern sides of the supercluster by determining the redshifts of 55 red-sequence galaxies and 82 star-forming galaxies in total via follow-up spectroscopy with Subaru/FOCAS and Gemini-N/GMOS. This suggests that the structure known as the CL1604 supercluster is the tip of the iceberg. We investigate the stellar population of the red-sequence galaxies using 4000 angstrom break and Balmer H delta absorption lines. Almost all of the red-sequence galaxies brighter than 21.5mag in the z band show an old stellar population of greater than or similar to 2 Gyr. The comparison of composite spectra of the red-sequence galaxies in the individual clusters show that the galaxies at a similar redshift have a similar stellar population age, even if they are located similar to 50 Mpc apart from each other. However, there could be a large variation in the star formation history. Therefore, it is likely that galaxies associated with the large-scale structure on a 50 Mpc scale formed at almost the same time, have assembled into the denser regions, and then have evolved with different star formation history along the hierarchical growth of the cosmic web.

引用

页数：19

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