Publication:
SILVERRUSH. II. First catalogs and properties of ∼2000 Lyα emitters and blobs at z ∼ 6-7 identified over the 14-21 deg<sup>2</sup> sky

Issued Date

2018-01-01

Resource Type

Article

ISSN

2053051X
00046264

DOI

10.1093/pasj/psx122

Other identifier(s)

2-s2.0-85041692674

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Mahidol University

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SCOPUS

Bibliographic Citation

Publications of the Astronomical Society of Japan. Vol.70, (2018)

Suggested Citation

Takatoshi Shibuya, Masami Ouchi, Akira Konno, Ryo Higuchi, Yuichi Harikane, Yoshiaki Ono, Kazuhiro Shimasaku, Yoshiaki Taniguchi, Masakazu A.R. Kobayashi, Masaru Kajisawa, Tohru Nagao, Hisanori Furusawa, Tomotsugu Goto, Nobunari Kashikawa, Yutaka Komiyama, Haruka Kusakabe, Chien Hsiu Lee, Rieko Momose, Kimihiko Nakajima, Masayuki Tanaka, Shiang Yu Wang, Suraphong Yuma SILVERRUSH. II. First catalogs and properties of ∼2000 Lyα emitters and blobs at z ∼ 6-7 identified over the 14-21 deg<sup>2</sup> sky. Publications of the Astronomical Society of Japan. Vol.70, (2018). doi:10.1093/pasj/psx122 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/45750

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Title

SILVERRUSH. II. First catalogs and properties of ∼2000 Lyα emitters and blobs at z ∼ 6-7 identified over the 14-21 deg<sup>2</sup> sky

Author(s)

Takatoshi Shibuya
 Masami Ouchi
 Akira Konno
 Ryo Higuchi
 Yuichi Harikane
 Yoshiaki Ono
 Kazuhiro Shimasaku
 Yoshiaki Taniguchi
 Masakazu A.R. Kobayashi
 Masaru Kajisawa
 Tohru Nagao
 Hisanori Furusawa
 Tomotsugu Goto
 Nobunari Kashikawa
 Yutaka Komiyama
 Haruka Kusakabe
 Chien Hsiu Lee
 Rieko Momose
 Kimihiko Nakajima
 Masayuki Tanaka
 Shiang Yu Wang
 Suraphong Yuma

Other Contributor(s)

Research Center for the Early Universe
 National Institutes of Natural Sciences - National Astronomical Observatory of Japan
 University of Tokyo
 European Southern Observatory
 The Graduate University for Advanced Studies
 National Tsing Hua University
 The Open University of Japan
 Mahidol University
 National Taiwan University
 Ehime University
 National Institute of Technology

Abstract

© The Author(s) 2017. Published by Oxford University Press on behalf of the Astronomical Society of Japan. All rights reserved. We present an unprecedentedly large catalog consisting of 2230 ≳ L∗ Lyα emitters (LAEs) at z = 5.7 and 6.6 on the 13.8 and 21.2 deg2 sky, respectively, that are identified by the SILVERRUSH program with the first narrow-band imaging data of the Hyper Suprime- Cam (HSC) survey. We confirm that the LAE catalog is reliable on the basis of 96 LAEs whose spectroscopic redshifts are already determined by this program and previous studies. This catalogue is also available online. Based on this catalogue, we derive the rest-frame Lyα equivalent-width distributions of LAEs at z - 5.7-6.6 that are reasonably explained by the exponential profiles with scale lengths of - 120-170A, showing no significant evolution from z - 5.7 to z - 6.6. We find that 275 LAEs with large equivalent widths (LEWs) of >240 A are candidates of young metal poor galaxies and AGNs. We also find that the fraction of LEW LAEs to all LAEs is 4% and 21% at z - 5.7 and z - 6.6, respectively. Our LAE catalog includes 11 Lyα blobs (LABs) that are LAEs with spatially extended Lyα emission with a profile that is clearly distinguished from those of stellar objects at the ≳3σ level. The number density of the LABs at z = 6-7 is ∼10-7-10-6 Mpc-3, being ∼10-100 times lower than those claimed for LABs at z - 2-3, suggestive of disappearing LABs at z ≳ 6, albeit with the different selection methods and criteria for the low and high-z LABs.

Keyword(s)

Earth and Planetary Sciences
 Physics and Astronomy

Availability

URI

https://repository.li.mahidol.ac.th/handle/20.500.14594/45750

Collections

Scopus 2018