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Please use this identifier to cite or link to this item: http://repository.li.mahidol.ac.th/dspace/handle/123456789/45750
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
Authors: 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
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
Keywords: Earth and Planetary Sciences;Physics and Astronomy
Issue Date: 1-Jan-2018
Citation: Publications of the Astronomical Society of Japan. Vol.70, (2018)
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.
URI: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85041692674&origin=inward
http://repository.li.mahidol.ac.th/dspace/handle/123456789/45750
ISSN: 2053051X
00046264
Appears in Collections:Scopus 2018

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