학술논문
Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). XVI. 69 New Quasars at 5.8 < z < 7.0
Document Type
Working Paper
Author
Matsuoka, Yoshiki; Iwasawa, Kazushi; Onoue, Masafusa; Izumi, Takuma; Kashikawa, Nobunari; Strauss, Michael A.; Imanishi, Masatoshi; Nagao, Tohru; Akiyama, Masayuki; Silverman, John D.; Asami, Naoko; Bosch, James; Furusawa, Hisanori; Goto, Tomotsugu; Gunn, James E.; Harikane, Yuichi; Ikeda, Hiroyuki; Ishimoto, Rikako; Kawaguchi, Toshihiro; Kato, Nanako; Kikuta, Satoshi; Kohno, Kotaro; Komiyama, Yutaka; Lee, Chien-Hsiu; Lupton, Robert H.; Minezaki, Takeo; Miyazaki, Satoshi; Murayama, Hitoshi; Nishizawa, Atsushi J.; Oguri, Masamune; Ono, Yoshiaki; Ouchi, Masami; Price, Paul A.; Sameshima, Hiroaki; Sugiyama, Naoshi; Tait, Philip J.; Takada, Masahiro; Takahashi, Ayumi; Takata, Tadafumi; Tanaka, Masayuki; Toba, Yoshiki; Utsumi, Yousuke; Wang, Shiang-Yu; Yamashita, Takuji
Source
Subject
Language
Abstract
We present the spectroscopic discovery of 69 quasars at 5.8 < z < 7.0, drawn from the Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP) imaging survey data. This is the 16th publication from the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project, and completes identification of all but the faintest candidates (i.e., i-band dropouts with zAB < 24 and y-band detections, and z-band dropouts with yAB < 24) with Bayesian quasar probability Pq > 0.1 in the HSC-SSP third public data release (PDR3). The sample reported here also includes three quasars with Pq < 0.1 at z ~ 6.6, which we selected in an effort to completely cover the reddest point sources with simple color cuts. The number of high-z quasars discovered in SHELLQs has now grown to 162, including 23 type-II quasar candidates. This paper also presents identification of seven galaxies at 5.6 < z < 6.7, an [O III] emitter at z = 0.954, and 31 Galactic cool stars and brown dwarfs. High-z quasars and galaxies comprise 75 % and 16 % respectively of all the spectroscopic SHELLQs objects that pass our latest selection algorithm with the PDR3 photometry. That is, a total of 91 % of the objects lie at z > 5.6. This demonstrates that the algorithm has very high efficiency, even though we are probing an unprecedentedly low-luminosity population down to M1450 ~ -21 mag.
Comment: Accepted for publication in The Astrophysical Journal Supplement Series
Comment: Accepted for publication in The Astrophysical Journal Supplement Series