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 - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles The Astrophysical Journal Year : 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

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

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 ≳80% completeness down to the Lyα luminosity of {log}({L}Lyα }/[{erg} {{{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 ≃ 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). 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 .

Dates and versions

insu-03666717 , version 1 (12-05-2022)

Identifiers

Cite

Yuichi Harikane, Masami Ouchi, Yoshiaki Ono, Seiji Fujimoto, Darko Donevski, et al.. 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. The Astrophysical Journal, 2019, 883, ⟨10.3847/1538-4357/ab2cd5⟩. ⟨insu-03666717⟩
2 View
0 Download

Altmetric

Share

Gmail Facebook X LinkedIn More