Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). IV. Discovery of 41 Quasars and Luminous Galaxies at 5.7 ≤ z ≤ 6.9

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

doi:10.3847/1538-4365/aac724

Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). IV. Discovery of 41 Quasars and Luminous Galaxies at 5.7 ≤ z ≤ 6.9

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

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Abstract

We report the discovery of 41 new high-z quasars and luminous galaxies that were spectroscopically identified at 5.7 ≤ z ≤ 6.9. This is the fourth in a series of papers from the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project, based on the deep multi-band imaging data collected by the Hyper Suprime-Cam (HSC) Subaru Strategic Program survey. We selected the photometric candidates using a Bayesian probabilistic algorithm and then carried out follow-up spectroscopy with the Gran Telescopio Canarias and the Subaru Telescope. Combined with the sample presented in the previous papers, we have now spectroscopically identified 137 extremely red HSC sources over about 650 deg², which includes 64 high-z quasars, 24 high-z luminous galaxies, 6 [O iii] emitters at z ∼ 0.8, and 43 Galactic cool dwarfs (low-mass stars and brown dwarfs). The new quasars span in luminosity range from M ₁₄₅₀ ∼ -26 to -22 mag, and continue to populate luminosities a few magnitudes lower than have been probed by previous wide-field surveys. In a companion paper, we derive the quasar luminosity function at z ∼ 6 over an unprecedentedly wide range of M ₁₄₅₀ ∼ -28 to -21 mag, exploiting the SHELLQs and other survey outcomes.

Original language	English (US)
Article number	5
Journal	Astrophysical Journal, Supplement Series
Volume	237
Issue number	1
DOIs	https://doi.org/10.3847/1538-4365/aac724
State	Published - Jul 2018

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

ages, reionization, first stars
galaxies: active
galaxies: high-redshift
intergalactic medium
quasars: general
quasars: supermassive black holes

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Matsuoka, Y., Iwasawa, K., Onoue, M., Kashikawa, N., Strauss, M. A., Lee, C. H., Imanishi, M., Nagao, T., Akiyama, M., Asami, N., Bosch, J., Furusawa, H., Goto, T., Gunn, J. E., Harikane, Y., Ikeda, H., Izumi, T., Kawaguchi, T., Kato, N., ... Yamashita, T. (2018). Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). IV. Discovery of 41 Quasars and Luminous Galaxies at 5.7 ≤ z ≤ 6.9. Astrophysical Journal, Supplement Series, 237(1), Article 5. https://doi.org/10.3847/1538-4365/aac724

@article{c05d2f8e5d0741efbe56589652785d60,

title = "Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). IV. Discovery of 41 Quasars and Luminous Galaxies at 5.7 ≤ z ≤ 6.9",

abstract = "We report the discovery of 41 new high-z quasars and luminous galaxies that were spectroscopically identified at 5.7 ≤ z ≤ 6.9. This is the fourth in a series of papers from the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project, based on the deep multi-band imaging data collected by the Hyper Suprime-Cam (HSC) Subaru Strategic Program survey. We selected the photometric candidates using a Bayesian probabilistic algorithm and then carried out follow-up spectroscopy with the Gran Telescopio Canarias and the Subaru Telescope. Combined with the sample presented in the previous papers, we have now spectroscopically identified 137 extremely red HSC sources over about 650 deg2, which includes 64 high-z quasars, 24 high-z luminous galaxies, 6 [O iii] emitters at z ∼ 0.8, and 43 Galactic cool dwarfs (low-mass stars and brown dwarfs). The new quasars span in luminosity range from M 1450 ∼ -26 to -22 mag, and continue to populate luminosities a few magnitudes lower than have been probed by previous wide-field surveys. In a companion paper, we derive the quasar luminosity function at z ∼ 6 over an unprecedentedly wide range of M 1450 ∼ -28 to -21 mag, exploiting the SHELLQs and other survey outcomes.",

keywords = "ages, reionization, first stars, galaxies: active, galaxies: high-redshift, intergalactic medium, quasars: general, quasars: supermassive black holes",

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

note = "Funding Information: The Pan-STARRS1 Surveys (PS1) have been made possible through contributions of the Institute for Astronomy, the University of Hawaii, the Pan-STARRS Project Office, the Max-Planck Society and its participating institutes, the Max Planck Institute for Astronomy, Heidelberg and the Max Planck Institute for Extraterrestrial Physics, Garching, The Johns Hopkins University, Durham University, the University of Edinburgh, Queen{\textquoteright}s University Belfast, the Harvard- Smithsonian Center for Astrophysics, the Las Cumbres Observatory Global Telescope Network Incorporated, the National Central University of Taiwan, the Space Telescope Science Institute, the National Aeronautics and Space Administration under Grant No. NNX08AR22G issued through the Planetary Science Division of the NASA Science Mission Directorate, the National Science Foundation under Grant No. AST-1238877, the University of Maryland, E{\"o}tv{\"o}s Lorand University (ELTE), and the Los Alamos National Laboratory. Funding Information: IRAF is distributed by the National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. Funding Information: The Hyper Suprime-Cam (HSC) collaboration includes the astronomical communities of Japan and Taiwan, and Princeton University. The HSC instrumentation and software were developed by NAOJ, the Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), the University of Tokyo, the High Energy Accelerator Research Organization (KEK), the Academia Sinica Institute for Astronomy and Astrophysics in Taiwan (ASIAA), and Princeton University. Funding was contributed by the FIRST program from Japanese Cabinet Office, the Ministry of Education, Culture, Sports, Science and Technology (MEXT), the Japan Society for the Promotion of Science (JSPS), Japan Science and Technology Publisher Copyright: {\textcopyright} 2018. The American Astronomical Society. All rights reserved..",

year = "2018",

month = jul,

doi = "10.3847/1538-4365/aac724",

language = "English (US)",

volume = "237",

journal = "Astrophysical Journal, Supplement Series",

issn = "0067-0049",

publisher = "IOP Publishing Ltd.",

number = "1",

}

Matsuoka, Y, Iwasawa, K, Onoue, M, Kashikawa, N, Strauss, MA, Lee, CH, Imanishi, M, Nagao, T, Akiyama, M, Asami, N, Bosch, J, Furusawa, H, Goto, T, Gunn, JE, Harikane, Y, Ikeda, H, Izumi, T, Kawaguchi, T, Kato, N, Kikuta, S, Kohno, K, Komiyama, Y, Lupton, RH, Minezaki, T, Miyazaki, S, Morokuma, T, Murayama, H, Niida, M, Nishizawa, AJ, Oguri, M, Ono, Y, Ouchi, M, Price, PA, Sameshima, H, Schulze, A, Shirakata, H, Silverman, JD, Sugiyama, N, Tait, PJ, Takada, M, Takata, T, Tanaka, M, Tang, JJ, Toba, Y, Utsumi, Y, Wang, SY & Yamashita, T 2018, 'Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). IV. Discovery of 41 Quasars and Luminous Galaxies at 5.7 ≤ z ≤ 6.9', Astrophysical Journal, Supplement Series, vol. 237, no. 1, 5. https://doi.org/10.3847/1538-4365/aac724

TY - JOUR

T1 - Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). IV. Discovery of 41 Quasars and Luminous Galaxies at 5.7 ≤ z ≤ 6.9

AU - Matsuoka, Yoshiki

AU - Iwasawa, Kazushi

AU - Onoue, Masafusa

AU - Kashikawa, Nobunari

AU - Strauss, Michael A.

AU - Lee, Chien Hsiu

AU - Imanishi, Masatoshi

AU - Nagao, Tohru

AU - Akiyama, Masayuki

AU - Asami, Naoko

AU - Bosch, James

AU - Furusawa, Hisanori

AU - Goto, Tomotsugu

AU - Gunn, James E.

AU - Harikane, Yuichi

AU - Ikeda, Hiroyuki

AU - Izumi, Takuma

AU - Kawaguchi, Toshihiro

AU - Kato, Nanako

AU - Kikuta, Satoshi

AU - Kohno, Kotaro

AU - Komiyama, Yutaka

AU - Lupton, Robert H.

AU - Minezaki, Takeo

AU - Miyazaki, Satoshi

AU - Morokuma, Tomoki

AU - Murayama, Hitoshi

AU - Niida, Mana

AU - Nishizawa, Atsushi J.

AU - Oguri, Masamune

AU - Ono, Yoshiaki

AU - Ouchi, Masami

AU - Price, Paul A.

AU - Sameshima, Hiroaki

AU - Schulze, Andreas

AU - Shirakata, Hikari

AU - Silverman, John D.

AU - Sugiyama, Naoshi

AU - Tait, Philip J.

AU - Takada, Masahiro

AU - Takata, Tadafumi

AU - Tanaka, Masayuki

AU - Tang, Ji Jia

AU - Toba, Yoshiki

AU - Utsumi, Yousuke

AU - Wang, Shiang Yu

AU - Yamashita, Takuji

N1 - Funding Information: The Pan-STARRS1 Surveys (PS1) have been made possible through contributions of the Institute for Astronomy, the University of Hawaii, the Pan-STARRS Project Office, the Max-Planck Society and its participating institutes, the Max Planck Institute for Astronomy, Heidelberg and the Max Planck Institute for Extraterrestrial Physics, Garching, The Johns Hopkins University, Durham University, the University of Edinburgh, Queen’s University Belfast, the Harvard- Smithsonian Center for Astrophysics, the Las Cumbres Observatory Global Telescope Network Incorporated, the National Central University of Taiwan, the Space Telescope Science Institute, the National Aeronautics and Space Administration under Grant No. NNX08AR22G issued through the Planetary Science Division of the NASA Science Mission Directorate, the National Science Foundation under Grant No. AST-1238877, the University of Maryland, Eötvös Lorand University (ELTE), and the Los Alamos National Laboratory. Funding Information: IRAF is distributed by the National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. Funding Information: The Hyper Suprime-Cam (HSC) collaboration includes the astronomical communities of Japan and Taiwan, and Princeton University. The HSC instrumentation and software were developed by NAOJ, the Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), the University of Tokyo, the High Energy Accelerator Research Organization (KEK), the Academia Sinica Institute for Astronomy and Astrophysics in Taiwan (ASIAA), and Princeton University. Funding was contributed by the FIRST program from Japanese Cabinet Office, the Ministry of Education, Culture, Sports, Science and Technology (MEXT), the Japan Society for the Promotion of Science (JSPS), Japan Science and Technology Publisher Copyright: © 2018. The American Astronomical Society. All rights reserved..

PY - 2018/7

Y1 - 2018/7

N2 - We report the discovery of 41 new high-z quasars and luminous galaxies that were spectroscopically identified at 5.7 ≤ z ≤ 6.9. This is the fourth in a series of papers from the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project, based on the deep multi-band imaging data collected by the Hyper Suprime-Cam (HSC) Subaru Strategic Program survey. We selected the photometric candidates using a Bayesian probabilistic algorithm and then carried out follow-up spectroscopy with the Gran Telescopio Canarias and the Subaru Telescope. Combined with the sample presented in the previous papers, we have now spectroscopically identified 137 extremely red HSC sources over about 650 deg2, which includes 64 high-z quasars, 24 high-z luminous galaxies, 6 [O iii] emitters at z ∼ 0.8, and 43 Galactic cool dwarfs (low-mass stars and brown dwarfs). The new quasars span in luminosity range from M 1450 ∼ -26 to -22 mag, and continue to populate luminosities a few magnitudes lower than have been probed by previous wide-field surveys. In a companion paper, we derive the quasar luminosity function at z ∼ 6 over an unprecedentedly wide range of M 1450 ∼ -28 to -21 mag, exploiting the SHELLQs and other survey outcomes.

AB - We report the discovery of 41 new high-z quasars and luminous galaxies that were spectroscopically identified at 5.7 ≤ z ≤ 6.9. This is the fourth in a series of papers from the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project, based on the deep multi-band imaging data collected by the Hyper Suprime-Cam (HSC) Subaru Strategic Program survey. We selected the photometric candidates using a Bayesian probabilistic algorithm and then carried out follow-up spectroscopy with the Gran Telescopio Canarias and the Subaru Telescope. Combined with the sample presented in the previous papers, we have now spectroscopically identified 137 extremely red HSC sources over about 650 deg2, which includes 64 high-z quasars, 24 high-z luminous galaxies, 6 [O iii] emitters at z ∼ 0.8, and 43 Galactic cool dwarfs (low-mass stars and brown dwarfs). The new quasars span in luminosity range from M 1450 ∼ -26 to -22 mag, and continue to populate luminosities a few magnitudes lower than have been probed by previous wide-field surveys. In a companion paper, we derive the quasar luminosity function at z ∼ 6 over an unprecedentedly wide range of M 1450 ∼ -28 to -21 mag, exploiting the SHELLQs and other survey outcomes.

KW - ages, reionization, first stars

KW - galaxies: active

KW - galaxies: high-redshift

KW - intergalactic medium

KW - quasars: general

KW - quasars: supermassive black holes

UR - http://www.scopus.com/inward/record.url?scp=85051164710&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85051164710&partnerID=8YFLogxK

U2 - 10.3847/1538-4365/aac724

DO - 10.3847/1538-4365/aac724

M3 - Article

AN - SCOPUS:85051164710

SN - 0067-0049

VL - 237

JO - Astrophysical Journal, Supplement Series

JF - Astrophysical Journal, Supplement Series

IS - 1

M1 - 5

ER -

Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). IV. Discovery of 41 Quasars and Luminous Galaxies at 5.7 ≤ z ≤ 6.9

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