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24 April 2024

» arxiv » 1603.2281

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Subaru high-$z$ exploration of low-luminosity quasars (SHELLQs). I. Discovery of 15 quasars and bright galaxies at $5.7 < z < 6.9$
Yoshiki Matsuoka ; Masafusa Onoue ; Nobunari Kashikawa ; Kazushi Iwasawa ; Michael A. Strauss ; Tohru Nagao ; Masatoshi Imanishi ; Mana Niida ; Yoshiki Toba ; Masayuki Akiyama ; Naoko Asami ; James Bosch ; Sébastien Foucaud ; Hisanori Furusawa ; Tomotsugu Goto ; James E. Gunn ; Yuichi Harikane ; Hiroyuki Ikeda ; Toshihiro Kawaguchi ; Satoshi Kikuta ; Yutaka Komiyama ; Robert H. Lupton ; Takeo Minezaki ; Satoshi Miyazaki ; Tomoki Morokuma ; Hitoshi Murayama ; Atsushi J. Nishizawa ; Yoshiaki Ono ; Masami Ouchi ; Paul A. Price ; Hiroaki Sameshima ; John D. Silverman ; Naoshi Sugiyama ; Philip J. Tait ; Masahiro Takada ; Tadafumi Takata ; Masayuki Tanaka ; Ji-Jia Tang ; Yousuke Utsumi ;
Date:	7 Mar 2016
Abstract:	We report the discovery of 15 quasars and bright galaxies at $5.7 < z < 6.9$. This is the initial result from the Subaru High-$z$ Exploration of Low-Luminosity Quasars (SHELLQs) project, which exploits the exquisite multi-band imaging data produced by the Subaru Hyper Suprime-Cam (HSC) Strategic Program survey. The candidate selection is performed by combining several photometric approaches including a Bayesian probabilistic algorithm to reject stars and dwarfs. The spectroscopic identification was carried out with the Gran Telescopio Canarias and the Subaru Telescope for the first 80 deg$^2$ of the survey footprint. The success rate of our photometric selection is quite high, approaching 100 % at the brighter magnitudes ($z_{ m AB} < 23.5$ mag). Our selection also recovered all the known high-$z$ quasars on the HSC images. Among the 15 discovered objects, six are likely quasars, while the other six with interstellar absorption lines and in some cases narrow emission lines are likely bright Lyman-break galaxies. The remaining three objects have weak continua and very strong and narrow Ly $alpha$ lines, which may be excited by ultraviolet light from both young stars and quasars. These results indicate that we are starting to see the steep rise of the luminosity function of $z ge 6$ galaxies, compared to that of quasars, at magnitudes fainter than $M_{ m 1450} sim -22$ mag or $z_{ m AB} sim 24$ mag. Follow-up studies of the discovered objects as well as further survey observations are ongoing.
Source:	arXiv, 1603.2281
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