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SILVERRUSH. VIII. Spectroscopic Identifications of Early Large-scale Structures with Protoclusters over 200 Mpc at z ∼ 6–7: Strong Associations of Dusty Star-forming Galaxies

Harikane, Yuichi; Ouchi, Masami; Ono, Yoshiaki; Fujimoto, Seiji; Donevski, Darko; Shibuya, Takatoshi; Faisst, Andreas L.; Goto, Tomotsugu; Hatsukade, Bunyo; Kashikawa, Nobunari; Kohno, Kotaro; Hashimoto, Takuya; Higuchi, Ryo; Inoue, Akio K.; Lin, Yen-Ting; Martin, Crystal L.; Overzier, Roderik; Smail, Ian; Toshikawa, Jun; Umehata, Hideki; Ao, Yiping; Chapman, Scott; Clements, David L.; Im, Myungshin; Jing, Yipeng; Kawaguchi, Toshihiro; Lee, Chien-Hsiu; Lee, Minju M.; Lin, Lihwai; Matsuoka, Yoshiki; Marinello, Murilo; Nagao, Tohru; Onodera, Masato; Toft, Sune; Wang, Wei-Hao

SILVERRUSH. VIII. Spectroscopic Identifications of Early Large-scale Structures with Protoclusters over 200 Mpc at z ∼ 6–7: Strong Associations of Dusty Star-forming Galaxies Thumbnail


Authors

Yuichi Harikane

Masami Ouchi

Yoshiaki Ono

Seiji Fujimoto

Darko Donevski

Takatoshi Shibuya

Andreas L. Faisst

Tomotsugu Goto

Bunyo Hatsukade

Nobunari Kashikawa

Kotaro Kohno

Takuya Hashimoto

Ryo Higuchi

Akio K. Inoue

Yen-Ting Lin

Crystal L. Martin

Roderik Overzier

Jun Toshikawa

Hideki Umehata

Yiping Ao

Scott Chapman

David L. Clements

Myungshin Im

Yipeng Jing

Toshihiro Kawaguchi

Chien-Hsiu Lee

Minju M. Lee

Lihwai Lin

Yoshiki Matsuoka

Murilo Marinello

Tohru Nagao

Masato Onodera

Sune Toft

Wei-Hao Wang



Abstract

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 gsim80% completeness down to the Lyα luminosity of $\mathrm{log}({L}_{\mathrm{Ly}\alpha }/[\mathrm{erg}\,{{\rm{s}}}^{-1}])=43.0$, 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 sime 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) gsim5 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). Comparisons with numerical simulations suggest that z57OD and z66OD are protoclusters that are progenitors of the present-day clusters with halo masses of ~1014 M ⊙.

Citation

Harikane, Y., Ouchi, M., Ono, Y., Fujimoto, S., Donevski, D., Shibuya, T., …Wang, W. (2019). SILVERRUSH. VIII. Spectroscopic Identifications of Early Large-scale Structures with Protoclusters over 200 Mpc at z ∼ 6–7: Strong Associations of Dusty Star-forming Galaxies. Astrophysical Journal, 883(2), Article 142. https://doi.org/10.3847/1538-4357/ab2cd5

Journal Article Type Article
Acceptance Date Jun 23, 2019
Online Publication Date Sep 30, 2019
Publication Date Oct 1, 2019
Deposit Date Oct 30, 2019
Publicly Available Date Oct 30, 2019
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 883
Issue 2
Article Number 142
DOI https://doi.org/10.3847/1538-4357/ab2cd5

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Copyright Statement
© 2019. The American Astronomical Society. All rights reserved,





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