Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). XVI. 69 New Quasars at 5.8 \textless z \textless 7.0. Matsuoka, Y., Iwasawa, K., Onoue, M., Izumi, T., Kashikawa, N., Strauss, M. A., Imanishi, M., Nagao, T., Akiyama, M., Silverman, J. D., Asami, N., Bosch, J., Furusawa, H., Goto, T., Gunn, J. E., Harikane, Y., Ikeda, H., Ishimoto, R., Kawaguchi, T., Kato, N., Kikuta, S., Kohno, K., Komiyama, Y., Lee, C., Lupton, R. H., Minezaki, T., Miyazaki, S., Murayama, H., Nishizawa, A. J., Oguri, M., Ono, Y., Ouchi, M., Price, P. A., Sameshima, H., Sugiyama, N., Tait, P. J., Takada, M., Takahashi, A., Takata, T., Tanaka, M., Toba, Y., Utsumi, Y., Wang, S., & Yamashita, T. arXiv:2111.12766 [astro-ph], November, 2021. arXiv: 2111.12766
Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). XVI. 69 New Quasars at 5.8 \textless z \textless 7.0 [link]Paper  abstract   bibtex   
We present the spectroscopic discovery of 69 quasars at 5.8 \textless z \textless 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 \textless 24 and y-band detections, and z-band dropouts with yAB \textless 24) with Bayesian quasar probability Pq \textgreater 0.1 in the HSC-SSP third public data release (PDR3). The sample reported here also includes three quasars with Pq \textless 0.1 at z \textasciitilde 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 \textless z \textless 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 \textgreater 5.6. This demonstrates that the algorithm has very high efficiency, even though we are probing an unprecedentedly low-luminosity population down to M1450 \textasciitilde -21 mag.
@article{matsuoka_subaru_2021,
	title = {Subaru {High}-z {Exploration} of {Low}-{Luminosity} {Quasars} ({SHELLQs}). {XVI}. 69 {New} {Quasars} at 5.8 {\textless} z {\textless} 7.0},
	url = {http://arxiv.org/abs/2111.12766},
	abstract = {We present the spectroscopic discovery of 69 quasars at 5.8 {\textless} z {\textless} 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 {\textless} 24 and y-band detections, and z-band dropouts with yAB {\textless} 24) with Bayesian quasar probability Pq {\textgreater} 0.1 in the HSC-SSP third public data release (PDR3). The sample reported here also includes three quasars with Pq {\textless} 0.1 at z {\textasciitilde} 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 {\textless} z {\textless} 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 {\textgreater} 5.6. This demonstrates that the algorithm has very high efficiency, even though we are probing an unprecedentedly low-luminosity population down to M1450 {\textasciitilde} -21 mag.},
	urldate = {2021-12-17},
	journal = {arXiv:2111.12766 [astro-ph]},
	author = {Matsuoka, Yoshiki and Iwasawa, Kazushi and Onoue, Masafusa and Izumi, Takuma and Kashikawa, Nobunari and Strauss, Michael A. and Imanishi, Masatoshi and Nagao, Tohru and Akiyama, Masayuki and Silverman, John D. and Asami, Naoko and Bosch, James and Furusawa, Hisanori and Goto, Tomotsugu and Gunn, James E. and Harikane, Yuichi and Ikeda, Hiroyuki and Ishimoto, Rikako and Kawaguchi, Toshihiro and Kato, Nanako and Kikuta, Satoshi and Kohno, Kotaro and Komiyama, Yutaka and Lee, Chien-Hsiu and Lupton, Robert H. and Minezaki, Takeo and Miyazaki, Satoshi and Murayama, Hitoshi and Nishizawa, Atsushi J. and Oguri, Masamune and Ono, Yoshiaki and Ouchi, Masami and Price, Paul A. and Sameshima, Hiroaki and Sugiyama, Naoshi and Tait, Philip J. and Takada, Masahiro and Takahashi, Ayumi and Takata, Tadafumi and Tanaka, Masayuki and Toba, Yoshiki and Utsumi, Yousuke and Wang, Shiang-Yu and Yamashita, Takuji},
	month = nov,
	year = {2021},
	note = {arXiv: 2111.12766},
	keywords = {Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics},
}
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