Subaru High- z Exploration of Low-luminosity Quasars (SHELLQs). XVI. 69 New Quasars at 5.8 < z < 7.0

Yoshiki Matsuoka; Kazushi Iwasawa; Masafusa Onoue; Takuma Izumi; Nobunari Kashikawa; Michael A. Strauss; Masatoshi Imanishi; Tohru Nagao; Masayuki Akiyama; John D. Silverman; Naoko Asami; James Bosch; Hisanori Furusawa; Tomotsugu Goto; James E. Gunn; Yuichi Harikane; Hiroyuki Ikeda; Rikako Ishimoto; Toshihiro Kawaguchi; Nanako Kato; Satoshi Kikuta; Kotaro Kohno; Yutaka Komiyama; Chien Hsiu Lee; Robert H. Lupton; Takeo Minezaki; Satoshi Miyazaki; Hitoshi Murayama; Atsushi J. Nishizawa; Masamune Oguri; Yoshiaki Ono; Masami Ouchi; Paul A. Price; Hiroaki Sameshima; Naoshi Sugiyama; Philip J. Tait; Masahiro Takada; Ayumi Takahashi; Tadafumi Takata; Masayuki Tanaka; Yoshiki Toba; Yousuke Utsumi; Shiang Yu Wang; Takuji Yamashita

doi:10.3847/1538-4365/ac3d31

Subaru High- z Exploration of Low-luminosity Quasars (SHELLQs). XVI. 69 New Quasars at 5.8 < z < 7.0

Yoshiki Matsuoka, Kazushi Iwasawa, Masafusa Onoue, Takuma Izumi, Nobunari Kashikawa, Michael A. Strauss, Masatoshi Imanishi, Tohru Nagao, Masayuki Akiyama, John D. Silverman, Naoko Asami, James Bosch, Hisanori Furusawa, Tomotsugu Goto, James E. Gunn, Yuichi Harikane, Hiroyuki Ikeda, Rikako Ishimoto, Toshihiro Kawaguchi, Nanako KatoSatoshi Kikuta, Kotaro Kohno, Yutaka Komiyama, Chien Hsiu Lee, Robert H. Lupton, Takeo Minezaki, Satoshi Miyazaki, Hitoshi Murayama, Atsushi J. Nishizawa, Masamune Oguri, Yoshiaki Ono, Masami Ouchi, Paul A. Price, Hiroaki Sameshima, Naoshi Sugiyama, Philip J. Tait, Masahiro Takada, Ayumi Takahashi, Tadafumi Takata, Masayuki Tanaka, Yoshiki Toba, Yousuke Utsumi, Shiang Yu Wang, Takuji Yamashita

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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 it completes identification of all but the faintest candidates (i.e., i-band dropouts with z AB < 24 and y-band detections, and z-band dropouts with y AB < 24) with Bayesian quasar probability PQB>0.1 in the HSC-SSP third public data release (PDR3). The sample reported here also includes three quasars with PQB<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 compose 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 M 1450 ∼-21 mag.

Original language	English (US)
Article number	18
Journal	Astrophysical Journal, Supplement Series
Volume	259
Issue number	1
DOIs	https://doi.org/10.3847/1538-4365/ac3d31
State	Published - Mar 2022

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-4365/ac3d31

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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., ... Yamashita, T. (2022). Subaru High- z Exploration of Low-luminosity Quasars (SHELLQs). XVI. 69 New Quasars at 5.8 < z < 7.0. Astrophysical Journal, Supplement Series, 259(1), Article 18. https://doi.org/10.3847/1538-4365/ac3d31

@article{522940e58211449d8b5c8416d06f3fce,

title = "Subaru High- z Exploration of Low-luminosity Quasars (SHELLQs). XVI. 69 New Quasars at 5.8 < z < 7.0",

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 it completes identification of all but the faintest candidates (i.e., i-band dropouts with z AB < 24 and y-band detections, and z-band dropouts with y AB < 24) with Bayesian quasar probability PQB>0.1 in the HSC-SSP third public data release (PDR3). The sample reported here also includes three quasars with PQB<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 compose 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 M 1450 ∼-21 mag.",

author = "Yoshiki Matsuoka and Kazushi Iwasawa and Masafusa Onoue and Takuma Izumi and Nobunari Kashikawa and Strauss, {Michael A.} and Masatoshi Imanishi and Tohru Nagao and Masayuki Akiyama and Silverman, {John D.} and Naoko Asami and James Bosch and Hisanori Furusawa and Tomotsugu Goto and Gunn, {James E.} and Yuichi Harikane and Hiroyuki Ikeda and Rikako Ishimoto and Toshihiro Kawaguchi and Nanako Kato and Satoshi Kikuta and Kotaro Kohno and Yutaka Komiyama and Lee, {Chien Hsiu} and Lupton, {Robert H.} and Takeo Minezaki and Satoshi Miyazaki and Hitoshi Murayama and Nishizawa, {Atsushi J.} and Masamune Oguri and Yoshiaki Ono and Masami Ouchi and Price, {Paul A.} and Hiroaki Sameshima and Naoshi Sugiyama and Tait, {Philip J.} and Masahiro Takada and Ayumi Takahashi and Tadafumi Takata and Masayuki Tanaka and Yoshiki Toba and Yousuke Utsumi and Wang, {Shiang Yu} and Takuji Yamashita",

note = "Publisher Copyright: {\textcopyright} 2022. The Author(s). Published by the American Astronomical Society.",

year = "2022",

month = mar,

doi = "10.3847/1538-4365/ac3d31",

language = "English (US)",

volume = "259",

journal = "Astrophysical Journal, Supplement Series",

issn = "0067-0049",

publisher = "IOP Publishing Ltd.",

number = "1",

}

Matsuoka, Y, Iwasawa, K, Onoue, M, Izumi, T, Kashikawa, N, Strauss, MA, Imanishi, M, Nagao, T, Akiyama, M, Silverman, JD, Asami, N, Bosch, J, Furusawa, H, Goto, T, Gunn, JE, Harikane, Y, Ikeda, H, Ishimoto, R, Kawaguchi, T, Kato, N, Kikuta, S, Kohno, K, Komiyama, Y, Lee, CH, Lupton, RH, Minezaki, T, Miyazaki, S, Murayama, H, Nishizawa, AJ, Oguri, M, Ono, Y, Ouchi, M, Price, PA, Sameshima, H, Sugiyama, N, Tait, PJ, Takada, M, Takahashi, A, Takata, T, Tanaka, M, Toba, Y, Utsumi, Y, Wang, SY & Yamashita, T 2022, 'Subaru High- z Exploration of Low-luminosity Quasars (SHELLQs). XVI. 69 New Quasars at 5.8 < z < 7.0', Astrophysical Journal, Supplement Series, vol. 259, no. 1, 18. https://doi.org/10.3847/1538-4365/ac3d31

TY - JOUR

T1 - Subaru High- z Exploration of Low-luminosity Quasars (SHELLQs). XVI. 69 New Quasars at 5.8 < z < 7.0

AU - Matsuoka, Yoshiki

AU - Iwasawa, Kazushi

AU - Onoue, Masafusa

AU - Izumi, Takuma

AU - Kashikawa, Nobunari

AU - Strauss, Michael A.

AU - Imanishi, Masatoshi

AU - Nagao, Tohru

AU - Akiyama, Masayuki

AU - Silverman, John D.

AU - Asami, Naoko

AU - Bosch, James

AU - Furusawa, Hisanori

AU - Goto, Tomotsugu

AU - Gunn, James E.

AU - Harikane, Yuichi

AU - Ikeda, Hiroyuki

AU - Ishimoto, Rikako

AU - Kawaguchi, Toshihiro

AU - Kato, Nanako

AU - Kikuta, Satoshi

AU - Kohno, Kotaro

AU - Komiyama, Yutaka

AU - Lee, Chien Hsiu

AU - Lupton, Robert H.

AU - Minezaki, Takeo

AU - Miyazaki, Satoshi

AU - Murayama, Hitoshi

AU - Nishizawa, Atsushi J.

AU - Oguri, Masamune

AU - Ono, Yoshiaki

AU - Ouchi, Masami

AU - Price, Paul A.

AU - Sameshima, Hiroaki

AU - Sugiyama, Naoshi

AU - Tait, Philip J.

AU - Takada, Masahiro

AU - Takahashi, Ayumi

AU - Takata, Tadafumi

AU - Tanaka, Masayuki

AU - Toba, Yoshiki

AU - Utsumi, Yousuke

AU - Wang, Shiang Yu

AU - Yamashita, Takuji

PY - 2022/3

Y1 - 2022/3

N2 - 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 it completes identification of all but the faintest candidates (i.e., i-band dropouts with z AB < 24 and y-band detections, and z-band dropouts with y AB < 24) with Bayesian quasar probability PQB>0.1 in the HSC-SSP third public data release (PDR3). The sample reported here also includes three quasars with PQB<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 compose 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 M 1450 ∼-21 mag.

AB - 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 it completes identification of all but the faintest candidates (i.e., i-band dropouts with z AB < 24 and y-band detections, and z-band dropouts with y AB < 24) with Bayesian quasar probability PQB>0.1 in the HSC-SSP third public data release (PDR3). The sample reported here also includes three quasars with PQB<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 compose 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 M 1450 ∼-21 mag.

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U2 - 10.3847/1538-4365/ac3d31

DO - 10.3847/1538-4365/ac3d31

M3 - Article

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SN - 0067-0049

VL - 259

JO - Astrophysical Journal, Supplement Series

JF - Astrophysical Journal, Supplement Series

IS - 1

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ER -

Subaru High- z Exploration of Low-luminosity Quasars (SHELLQs). XVI. 69 New Quasars at 5.8 < z < 7.0

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