The discovery of primeval large-scale structures with forming clusters at redshift

Masami Ouchi; Kazuhiro Shimasaku; Masayuki Akiyama; Kazuhiro Sekiguchi; Hisanori Furusawa; Sadanori Okamura; Nobunari Kashikawa; Masanori Iye; Tadayuki Kodama; Tomoki Saito; Toshiyuki Sasaki; Chris Simpson; Tadafumi Takata; Toru Yamada; Hitomi Yamanoi; Makiko Yoshida; Michitoshi Yoshida

doi:10.1086/428499

The discovery of primeval large-scale structures with forming clusters at redshift

Masami Ouchi, Kazuhiro Shimasaku, Masayuki Akiyama, Kazuhiro Sekiguchi, Hisanori Furusawa, Sadanori Okamura, Nobunari Kashikawa, Masanori Iye, Tadayuki Kodama, Tomoki Saito, Toshiyuki Sasaki, Chris Simpson, Tadafumi Takata, Toru Yamada, Hitomi Yamanoi, Makiko Yoshida, Michitoshi Yoshida

SCI - Astronomy

Research output: Contribution to journal › Article › peer-review

157 Citations (Scopus)

Abstract

We report the discovery of primeval large-scale structures (LSSs) including two protoclusters in a forming phase at z = 5.7. We carried out extensive deep narrowband imaging in the 1 deg² sky of the Subaru/XMM-Newton Deep Field and obtained a cosmic map of 515 Lyα emitters (LAEs) in a volume with a transverse dimension of 180 Mpc × 180 Mpc and a depth of ∼40 Mpc in comoving units. This cosmic map shows filamentary LSSs, including clusters and surrounding 10-40 Mpc scale voids, similar to the present-day LSSs. Our spectroscopic follow-up observations identify overdense regions in which two dense clumps of LAEs with a sphere of 1 Mpc diameter in physical units are included. These clumps show about 130 times higher star formation rate density, mainly due to a large overdensity, ∼80, of LAEs. These clumps would be clusters in a formation phase involving a burst of galaxy formation.

Original language	English
Pages (from-to)	L1-L4
Journal	Astrophysical Journal
Volume	620
Issue number	1 II
DOIs	https://doi.org/10.1086/428499
Publication status	Published - 2005 Feb 10

Keywords

Galaxies: clusters: general
Galaxies: formation
Large-scale structure of universe

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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Ouchi, M., Shimasaku, K., Akiyama, M., Sekiguchi, K., Furusawa, H., Okamura, S., Kashikawa, N., Iye, M., Kodama, T., Saito, T., Sasaki, T., Simpson, C., Takata, T., Yamada, T., Yamanoi, H., Yoshida, M., & Yoshida, M. (2005). The discovery of primeval large-scale structures with forming clusters at redshift. Astrophysical Journal, 620(1 II), L1-L4. https://doi.org/10.1086/428499

The discovery of primeval large-scale structures with forming clusters at redshift. / Ouchi, Masami; Shimasaku, Kazuhiro; Akiyama, Masayuki; Sekiguchi, Kazuhiro; Furusawa, Hisanori; Okamura, Sadanori; Kashikawa, Nobunari; Iye, Masanori; Kodama, Tadayuki; Saito, Tomoki; Sasaki, Toshiyuki; Simpson, Chris; Takata, Tadafumi; Yamada, Toru; Yamanoi, Hitomi; Yoshida, Makiko; Yoshida, Michitoshi.

In: Astrophysical Journal, Vol. 620, No. 1 II, 10.02.2005, p. L1-L4.

Research output: Contribution to journal › Article › peer-review

Ouchi, M, Shimasaku, K, Akiyama, M, Sekiguchi, K, Furusawa, H, Okamura, S, Kashikawa, N, Iye, M, Kodama, T, Saito, T, Sasaki, T, Simpson, C, Takata, T, Yamada, T, Yamanoi, H, Yoshida, M & Yoshida, M 2005, 'The discovery of primeval large-scale structures with forming clusters at redshift', Astrophysical Journal, vol. 620, no. 1 II, pp. L1-L4. https://doi.org/10.1086/428499

Ouchi, Masami ; Shimasaku, Kazuhiro ; Akiyama, Masayuki ; Sekiguchi, Kazuhiro ; Furusawa, Hisanori ; Okamura, Sadanori ; Kashikawa, Nobunari ; Iye, Masanori ; Kodama, Tadayuki ; Saito, Tomoki ; Sasaki, Toshiyuki ; Simpson, Chris ; Takata, Tadafumi ; Yamada, Toru ; Yamanoi, Hitomi ; Yoshida, Makiko ; Yoshida, Michitoshi. / The discovery of primeval large-scale structures with forming clusters at redshift. In: Astrophysical Journal. 2005 ; Vol. 620, No. 1 II. pp. L1-L4.

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AU - Furusawa, Hisanori

AU - Okamura, Sadanori

AU - Kashikawa, Nobunari

AU - Iye, Masanori

AU - Kodama, Tadayuki

AU - Saito, Tomoki

AU - Sasaki, Toshiyuki

AU - Simpson, Chris

AU - Takata, Tadafumi

AU - Yamada, Toru

AU - Yamanoi, Hitomi

AU - Yoshida, Makiko

AU - Yoshida, Michitoshi

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AB - We report the discovery of primeval large-scale structures (LSSs) including two protoclusters in a forming phase at z = 5.7. We carried out extensive deep narrowband imaging in the 1 deg2 sky of the Subaru/XMM-Newton Deep Field and obtained a cosmic map of 515 Lyα emitters (LAEs) in a volume with a transverse dimension of 180 Mpc × 180 Mpc and a depth of ∼40 Mpc in comoving units. This cosmic map shows filamentary LSSs, including clusters and surrounding 10-40 Mpc scale voids, similar to the present-day LSSs. Our spectroscopic follow-up observations identify overdense regions in which two dense clumps of LAEs with a sphere of 1 Mpc diameter in physical units are included. These clumps show about 130 times higher star formation rate density, mainly due to a large overdensity, ∼80, of LAEs. These clumps would be clusters in a formation phase involving a burst of galaxy formation.

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The discovery of primeval large-scale structures with forming clusters at redshift

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Keywords

ASJC Scopus subject areas

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