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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
- Source :
- The Astrophysical Journal, vol 883, iss 2, Astrophysical Journal, vol 883, iss 2, The Astrophysical Journal, Astrophysical journal, 2019, Vol.883(2), pp.142 [Peer Reviewed Journal], The Astrophysical Journal, 2019, 883, ⟨10.3847/1538-4357/ab2cd5⟩
- Publication Year :
- 2019
- Publisher :
- eScholarship, University of California, 2019.
-
Abstract
- We have obtained three-dimensional maps of the universe in $\sim200\times200\times80$ comoving Mpc$^3$ (cMpc$^3$) volumes each at $z=5.7$ and $6.6$ based on a spectroscopic sample of 179 galaxies that achieves $\gtrsim80$\% completeness down to the Ly$\alpha$ luminosity of $\log(L_{\rm Ly\alpha}/[\mathrm{erg\ s^{-1}}])=43.0$, 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 $z\simeq 4-6$ 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) $\gtrsim5$ 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 $\sim10^{14}\ \mathrm{M_\odot}$.<br />Comment: 17 pages, 11 figures, Accepted for Publication in ApJ
- Subjects :
- 010504 meteorology & atmospheric sciences
Astrophysics
Star (graph theory)
Physical Chemistry
01 natural sciences
Atomic
Luminosity
LY-ALPHA EMITTERS
Particle and Plasma Physics
galaxies: high-redshift
010303 astronomy & astrophysics
Physics
0306 Physical Chemistry (incl. Structural)
ENVIRONMENTAL DEPENDENCE
LYMAN-BREAK GALAXIES
Physical Sciences
0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
DENSITY RELATION
Halo
galaxies: evolution
high-redshift [galaxies]
Astronomical and Space Sciences
Physical Chemistry (incl. Structural)
EMITTING GALAXIES
formation [galaxies]
FOS: Physical sciences
Scale (descriptive set theory)
RADIO GALAXY
Astronomy & Astrophysics
PROTO-CLUSTER
0103 physical sciences
0201 Astronomical and Space Sciences
Galaxy formation and evolution
galaxies: formation
Nuclear
evolution [galaxies]
0105 earth and related environmental sciences
Science & Technology
NEBULAR EMISSION
Molecular
Astronomy and Astrophysics
DEEP SURVEY
Astrophysics - Astrophysics of Galaxies
Galaxy
Redshift
Stars
[SDU]Sciences of the Universe [physics]
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
HIGH-REDSHIFT
Subjects
Details
- ISSN :
- 0004637X, 15384357, 15383873, 01851101, 15383881, 00046361, and 00670049
- Database :
- OpenAIRE
- Journal :
- The Astrophysical Journal, vol 883, iss 2, Astrophysical Journal, vol 883, iss 2, The Astrophysical Journal, Astrophysical journal, 2019, Vol.883(2), pp.142 [Peer Reviewed Journal], The Astrophysical Journal, 2019, 883, ⟨10.3847/1538-4357/ab2cd5⟩
- Accession number :
- edsair.doi.dedup.....1221bde9646488c8b4cee87e7dd7b21f