SILVERRUSH. III. Deep Optical and Near-Infrared Spectroscopy for Lya and UV-Nebular Lines of Bright Lya Emitters at z=6-7
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 +25 more
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In this article, Li et al. presented Lya and UV-nebular emission line properties of bright Lya emitters (LAEs) at z=6-7 with a luminosity of log L_Lya/[erg s-1] = 43-44 identified in the 21-deg2 area of the SILVERRUSH early sample developed with the Subaru Hyper Suprime-Cam (HSC) survey data.Abstract:
We present Lya and UV-nebular emission line properties of bright Lya emitters (LAEs) at z=6-7 with a luminosity of log L_Lya/[erg s-1] = 43-44 identified in the 21-deg2 area of the SILVERRUSH early sample developed with the Subaru Hyper Suprime-Cam (HSC) survey data. Our optical spectroscopy newly confirm 21 bright LAEs with clear Lya emission, and contribute to make a spectroscopic sample of 96 LAEs at z=6-7 in SILVERRUSH. From the spectroscopic sample, we select 7 remarkable LAEs as bright as Himiko and CR7 objects, and perform deep Keck/MOSFIRE and Subaru/nuMOIRCS near-infrared spectroscopy reaching the 3sigma-flux limit of ~ 2x10^{-18} erg s-1 for the UV-nebular emission lines of He II1640, C IV1548,1550, and O III]1661,1666. 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 (EW_0) of ~2-4 A for He II, C IV, and O III] lines. Here we also investigate the VLT/X-SHOOTER spectrum of CR7 whose 6 sigma detection of He II is claimed by Sobral et al. Although two individuals and the ESO-archive service carefully re-analyze 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. 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 EW_0 and UV-continuum luminosity, which are similar to those found at z~2-3.read more
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Binary Population and Spectral Synthesis Version 2.1: construction, observational verification and new results
John J. Eldridge,Elizabeth R. Stanway,L. Xiao,L. A. S. McClelland,G. Taylor,M. Ng,Stephanie M. L. Greis,J. C. Bray +7 more
TL;DR: The Binary Population and Spectral Synthesis suite of binary stellar evolution models and synthetic stellar populations provides a framework for the physically motivated analysis of both the integrated light from distant stellar populations and the detailed properties of those nearby as discussed by the authors.
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Binary Population and Spectral Synthesis Version 2.1: construction, observational verification and new results
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TL;DR: The Binary Population and Spectral Synthesis (BPASS) suite of binary stellar evolution models and synthetic stellar populations provides a framework for the physically motivated analysis of both the integrated light from distant stellar populations and the detailed properties of those nearby as mentioned in this paper.
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Great Optically Luminous Dropout Research Using Subaru HSC (GOLDRUSH). I. UV luminosity functions at z ∼ 4-7 derived with the half-million dropouts on the 100 deg2 sky
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TL;DR: In this paper, the authors studied the UV luminosity functions (LFs) at 4, 5, 6, and 7$ on the 100 deg$^2$ sky of the Hyper Suprime-Cam (HSC) strategic program (SSP).
Journal ArticleDOI
Great Optically Luminous Dropout Research Using Subaru HSC (GOLDRUSH). I. UV Luminosity Functions at $z \sim 4-7$ Derived with the Half-Million Dropouts on the 100 deg$^2$ Sky
Yoshiaki Ono,Masami Ouchi,Yuichi Harikane,Jun Toshikawa,Michael Rauch,Suraphong Yuma,Marcin Sawicki,Takatoshi Shibuya,Kazuhiro Shimasaku,Masamune Oguri,Chris J. Willott,Mohammad Akhlaghi,Masayuki Akiyama,Jean Coupon,Nobunari Kashikawa,Yutaka Komiyama,Akira Konno,Lihwai Lin,Yoshiki Matsuoka,Satoshi Miyazaki,Tohru Nagao,Kimihiko Nakajima,John D. Silverman,Masayuki Tanaka,Yoshiaki Taniguchi,Shiang-Yu Wang +25 more
TL;DR: In this paper, the authors studied the UV luminosity functions (LFs) at $z\sim 4, $5, $6, and $7$ based on the deep large-area optical images taken by the HSC Subaru strategic program (SSP).
Journal ArticleDOI
Systematic Identification of LAEs for Visible Exploration and Reionization Research Using Subaru HSC (SILVERRUSH). I. Program strategy and clustering properties of ∼2000 Lyα emitters at z = 6–7 over the 0.3–0.5 Gpc2 survey area
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A High Space Density of Luminous Lyα Emitters at z ∼ 6.5
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