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Title: SILVERRUSH. III. Deep optical and near-infrared spectroscopy for Lyα and UV-nebular lines of bright Lyα emitters at z = 6-7
Authors: Takatoshi Shibuya
Masami Ouchi
Yuichi Harikane
Michael Rauch
Yoshiaki Ono
Shiro Mukae
Ryo Higuchi
Takashi Kojima
Suraphong Yuma
Chien Hsiu Lee
Hisanori Furusawa
Akira Konno
Crystal L. Martin
Kazuhiro Shimasaku
Yoshiaki Taniguchi
Masakazu A.R. Kobayashi
Masaru Kajisawa
Tohru Nagao
Tomotsugu Goto
Nobunari Kashikawa
Yutaka Komiyama
Haruka Kusakabe
Rieko Momose
Kimihiko Nakajima
Masayuki Tanaka
Shiang Yu Wang
Research Center for the Early Universe
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
University of California, Santa Barbara
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
Carnegie Observatories
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 2017. Published by Oxford University Press on behalf of the Astronomical Society of Japan. All rights reserved. We present Lyα and UV-nebular emission line properties of bright Lyα emitters (LAEs) at z = 6-7 with a luminosity of log LLyα/[erg s-1] = 43-44 identified in the 21 deg2 area of the SILVERRUSH early sample developed with the Subaru Hyper Suprime-Cam survey data. Our optical spectroscopy newly confirms 21 bright LAEs with clear Lyα emission, and contributes to making a spectroscopic sample of 96 LAEs at z = 6-7 in SILVERRUSH. From the spectroscopic sample, we select seven remarkable LAEs as bright as Himiko and CR7 objects, and perform deep Keck/MOSFIRE and Subaru/nuMOIRCS near-infrared spectroscopy reaching the 3 σ flux limit of ∼2 × 10-18 erg s-1 for the UV-nebular emission lines of He II λ1640, CIV λλ1548,1550, and OIII]λλ1661,1666. Except for one tentative detection of C IV, we find no strong UV-nebular lines down to the flux limit, placing the upper limits of the rest-frame equivalent widths (EW0) of ∼2-4 A for CIV, He II, and OIII] lines. We also investigate the VLT/X-SHOOTER spectrum of CR7 whose 6 σ detection of He II is claimed by Sobral et al. Although two individuals and the ESO archive service carefully reanalyzed the X-SHOOTER data that are used in the study of Sobral et al., no He II signal of CR7 is detected, supportive of weak UV-nebular lines of the bright LAEs even for CR7. The spectral properties of these bright LAEs are thus clearly different from those of faint dropouts at z ∼ 7 that have strong UV-nebular lines shown in the various studies. Comparing these bright LAEs and the faint dropouts, we find anti-correlations between the UV-nebular line EW0 and the UV-continuum luminosity, which are similar to those found at z ∼ 2-3.
ISSN: 2053051X
Appears in Collections:Scopus 2018

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