TY - JOUR
T1 - SILVERRUSH. VIII. Spectroscopic Identifications of Early Large-scale Structures with Protoclusters over 200 Mpc at z ∼ 6-7
T2 - Strong Associations of Dusty Star-forming Galaxies
AU - Harikane, Yuichi
AU - Ouchi, Masami
AU - Ono, Yoshiaki
AU - Fujimoto, Seiji
AU - Donevski, Darko
AU - Shibuya, Takatoshi
AU - Faisst, Andreas L.
AU - Goto, Tomotsugu
AU - Hatsukade, Bunyo
AU - Kashikawa, Nobunari
AU - Kohno, Kotaro
AU - Hashimoto, Takuya
AU - Higuchi, Ryo
AU - Inoue, Akio K.
AU - Lin, Yen Ting
AU - Martin, Crystal L.
AU - Overzier, Roderik
AU - Smail, Ian
AU - Toshikawa, Jun
AU - Umehata, Hideki
AU - Ao, Yiping
AU - Chapman, Scott
AU - Clements, David L.
AU - Im, Myungshin
AU - Jing, Yipeng
AU - Kawaguchi, Toshihiro
AU - Lee, Chien Hsiu
AU - Lee, Minju M.
AU - Lin, Lihwai
AU - Matsuoka, Yoshiki
AU - Marinello, Murilo
AU - Nagao, Tohru
AU - Onodera, Masato
AU - Toft, Sune
AU - Wang, Wei Hao
N1 - Publisher Copyright:
© 2019 The American Astronomical Society. All rights reserved.
PY - 2019/10/1
Y1 - 2019/10/1
N2 - We have obtained three-dimensional maps of the universe in ∼200 × 200 × 80 comoving Mpc3 (cMpc3) volumes each at z = 5.7 and 6.6 based on a spectroscopic sample of 179 galaxies that achieves ⪆80% completeness down to the Lyα luminosity of, based on our Keck and Gemini observations and the literature. The maps reveal filamentary large-scale structures and two remarkable overdensities made out of at least 44 and 12 galaxies at z = 5.692 (z57OD) and z = 6.585 (z66OD), respectively, making z66OD the most distant overdensity spectroscopically confirmed to date, with >10 spectroscopically confirmed galaxies. We compare spatial distributions of submillimeter galaxies at z ≃ 4-6 with our z = 5.7 galaxies forming the large-scale structures, and detect a 99.97% signal of cross-correlation, indicative of a clear coincidence of dusty star-forming galaxy and dust-unobscured galaxy formation at this early epoch. The galaxies in z57OD and z66OD are actively forming stars with star-formation rates (SFRs) ⪆5 times higher than the main sequence, and particularly the SFR density in z57OD is 10 times higher than the cosmic average at the redshift (a.k.a. the Madau-Lilly plot).
AB - We have obtained three-dimensional maps of the universe in ∼200 × 200 × 80 comoving Mpc3 (cMpc3) volumes each at z = 5.7 and 6.6 based on a spectroscopic sample of 179 galaxies that achieves ⪆80% completeness down to the Lyα luminosity of, based on our Keck and Gemini observations and the literature. The maps reveal filamentary large-scale structures and two remarkable overdensities made out of at least 44 and 12 galaxies at z = 5.692 (z57OD) and z = 6.585 (z66OD), respectively, making z66OD the most distant overdensity spectroscopically confirmed to date, with >10 spectroscopically confirmed galaxies. We compare spatial distributions of submillimeter galaxies at z ≃ 4-6 with our z = 5.7 galaxies forming the large-scale structures, and detect a 99.97% signal of cross-correlation, indicative of a clear coincidence of dusty star-forming galaxy and dust-unobscured galaxy formation at this early epoch. The galaxies in z57OD and z66OD are actively forming stars with star-formation rates (SFRs) ⪆5 times higher than the main sequence, and particularly the SFR density in z57OD is 10 times higher than the cosmic average at the redshift (a.k.a. the Madau-Lilly plot).
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U2 - 10.3847/1538-4357/ab2cd5
DO - 10.3847/1538-4357/ab2cd5
M3 - Article
AN - SCOPUS:85073712617
SN - 0004-637X
VL - 883
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 142
ER -