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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 and Faisst, Andreas L. (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). Art. No. 142. ISSN 1538-4357. https://resolver.caltech.edu/CaltechAUTHORS:20190930-143629603

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Abstract

We have obtained three-dimensional maps of the universe in ~200 × 200 × 80 comoving Mpc^3 (cMpc^3) 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 ~10^(14) M_⊙.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-4357/ab2cd5DOIArticle
https://iopscience.iop.org/article/10.3847/1538-4357/ab2cd5PublisherArticle
https://arxiv.org/abs/1902.09555arXivDiscussion Paper
ORCID:
AuthorORCID
Harikane, Yuichi0000-0002-6047-430X
Faisst, Andreas L.0000-0002-9382-9832
Additional Information:© 2019 The American Astronomical Society. Received 2019 February 20; revised 2019 June 11; accepted 2019 June 23; published 2019 September 30. We thank the anonymous referee for a careful reading and valuable comments that improved the clarity of the paper. We are grateful to Renyue Cen, Yi-Kuan Chiang, Tadayuki Kodama, and Ken Mawatari for their useful comments and discussions. The Hyper Suprime-Cam (HSC) collaboration includes the astronomical communities of Japan and Taiwan, and Princeton University. The HSC instrumentation and software were developed by the National Astronomical Observatory of Japan (NAOJ), the Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), the University of Tokyo, the High Energy Accelerator Research Organization (KEK), the Academia Sinica Institute for Astronomy and Astrophysics in Taiwan (ASIAA), and Princeton University. Funding was contributed by the FIRST program from Japanese Cabinet Office, the Ministry of Education, Culture, Sports, Science and Technology (MEXT), the Japan Society for the Promotion of Science (JSPS), Japan Science and Technology Agency (JST), the Toray Science Foundation, NAOJ, Kavli IPMU, KEK, ASIAA, and Princeton University. This paper makes use of software developed for the Large Synoptic Survey Telescope. We thank the LSST Project for making their code available as free software at http://dm.lsst.org. This work is based on observations obtained at the Gemini Observatory processed using the Gemini IRAF package, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, Tecnologia e Inovação (Brazil). This work is supported by the World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan, and a KAKENHI (15H02064, 17H01110, and 17H01114) Grant-in-Aid for Scientific Research (A) through the Japan Society for the Promotion of Science (JSPS). Y.H. acknowledges support from the Advanced Leading Graduate Course for Photon Science (ALPS) grant and the JSPS through the JSPS Research Fellowship for Young Scientists. N.K. acknowledges support from the JSPS grant 15H03645. I.R.S. acknowledges supports from STFC (ST/P000541/1) and the ERC Advanced Grant DUSTYGAL (321334). M.I. acknowledges the support from National Research Foundation of Korea (NRF) grant No. 2017R1A3A3001362.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
Japanese Cabinet OfficeUNSPECIFIED
Ministry of Education, Culture, Sports, Science and Technology (MEXT)UNSPECIFIED
Japan Science and Technology AgencyUNSPECIFIED
Toray Science FoundationUNSPECIFIED
National Astronomical Observatory of JapanUNSPECIFIED
Kavli Institute for the Physics and Mathematics of the UniverseUNSPECIFIED
High Energy Accelerator Research Organization (KEK)UNSPECIFIED
Academia Sinica Institute of Astronomy and Astrophysics (ASIAA)UNSPECIFIED
Princeton UniversityUNSPECIFIED
Japan Society for the Promotion of Science (JSPS)15H02064
Japan Society for the Promotion of Science (JSPS)17H01110
Japan Society for the Promotion of Science (JSPS)17H01114
Advanced Leading Graduate Course for Photon ScienceUNSPECIFIED
Japan Society for the Promotion of Science (JSPS)15H03645
Science and Technology Facilities Council (STFC)ST/P000541/1
European Research Council (ERC)321334
National Research Foundation of Korea2017R1A3A3001362
Subject Keywords:galaxies: evolution – galaxies: formation – galaxies: high-redshift
Issue or Number:2
Record Number:CaltechAUTHORS:20190930-143629603
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190930-143629603
Official Citation:Yuichi Harikane et al 2019 ApJ 883 142
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98963
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:30 Sep 2019 21:57
Last Modified:03 Oct 2019 21:46

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