@article{6d9ffa576dde43e8968b0b608080c427,
title = "Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). II. Discovery of 32 quasars and luminous galaxies at 5.7 < z ≤ 6.8",
abstract = "We present spectroscopic identification of 32 new quasars and luminous galaxies discovered at 5.7 < z ≤ 6.8. This is the second in a series of papers presenting the results of the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project, which exploits the deep multi-band imaging data produced by the Hyper Suprime-Cam (HSC) Subaru Strategic Program survey. The photometric candidates were selected by a Bayesian probabilistic algorithm, and then observed with spectrographs on the Gran Telescopio Canarias and the Subaru Telescope. Combined with the sample presented in the previous paper of this series, we have now identified 64 HSC sources over about 430 deg2, which include 33 high-z quasars, 14 high-z luminous galaxies, two [OIII] emitters at z ∼ 0.8, and 15 Galactic brown dwarfs. The new quasars have considerably lower luminosity (M1450 ∼ -25 to -22 mag) than most of the previously known high-z quasars. Several of these quasars have luminous (>1043 erg s-1) and narrow (< 500kms-1) Lyα lines, and also a possible mini broad-absorption-line system of N V λ1240 in the composite spectrum, which clearly separate them from typical quasars. On the other hand, the high-z galaxies have extremely high luminosities (M1450 ∼ -24 to -22 mag) compared to other galaxies found at similar redshifts. With the discovery of these new classes of objects, we are opening up new parameter spaces in the high-z Universe. Further survey observations and follow-up studies of the identified objects, including the construction of the quasar luminosity function at z ∼ 6, are ongoing.",
keywords = "Active-galaxies, Dark ages, First stars-galaxies, General-quasars, High-redshift-quasars, Reionization, Supermassive black holes",
author = "Yoshiki Matsuoka and Masafusa Onoue and Nobunari Kashikawa and Kazushi Iwasawa and Strauss, {Michael A.} and Tohru Nagao and Masatoshi Imanishi and Lee, {Chien Hsiu} and Masayuki Akiyama and Naoko Asami and James Bosch and S{\'e}bastien Foucaud and Hisanori Furusawa and Tomotsugu Goto and Gunn, {James E.} and Yuichi Harikane and Hiroyuki Ikeda and Takuma Izumi and Toshihiro Kawaguchi 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}",
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, Eotvos Lorand University (ELTE) and the Los Alamos National Laboratory. Funding Information: YM was supported by JSPS KAKENHI Grant No. JP17H04830. NK acknowledges support from the Japan Society for the Promotion of Science (JSPS) through Grant-in-Aid for Scientific Research 15H03645. KI acknowledges support by the Spanish MINECO under grant AYA2016-76012-C3-1-P and MDM-2014-0369 of ICCUB (Unidad de Excelencia {\textquoteright}Mar{\'i}a de Maeztu{\textquoteright}). TN acknowledges support from the JSPS (KAKENHI grant no. 16H01101 and 16H03958). KK was supported by JSPS Grant-in-Aid for Scientific Research (A) Number 25247019. 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 Agency (JST), the Toray Science Foundation, NAOJ, Kavli IPMU, KEK, ASIAA, and Princeton University. Publisher Copyright: {\textcopyright} The Author 2017. Published by Oxford University Press on behalf of the Astronomical Society of Japan. All rights reserved.",
year = "2018",
month = jan,
day = "1",
doi = "10.1093/pasj/psx046",
language = "English",
volume = "70",
journal = "Publication of the Astronomical Society of Japan",
issn = "0004-6264",
publisher = "Oxford University Press",
number = "Special Issue 1",
}