TY - JOUR
T1 - Discovery of the First Low-luminosity Quasar at z > 7
AU - Matsuoka, Yoshiki
AU - Onoue, Masafusa
AU - Kashikawa, Nobunari
AU - Strauss, Michael A.
AU - Iwasawa, Kazushi
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 - Koyama, Shuhei
AU - Lupton, Robert H.
AU - Minezaki, Takeo
AU - Miyazaki, Satoshi
AU - Murayama, Hitoshi
AU - Niida, Mana
AU - Nishizawa, Atsushi J.
AU - Noboriguchi, Akatoki
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, and Eotvos Lorand University (ELTE).
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 the National Astronomical Observatory of Japan (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.
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:
This work is also based on observations obtained at the Gemini Observatory and processed using the Gemini IRAF package. The Observatory is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, Tecnologia e Inovação (Brazil).
Funding Information:
Y.M. was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI grant No. JP17H04830 and the Mitsubishi Foundation grant No. 30140. N.K. acknowledges supports from the JSPS grant 15H03645. K.I. acknowledges support by the Spanish MINECO under grant No. AYA2016-76012-C3-1-P and MDM-2014-0369 of ICCUB (Unidad de Excelencia “María deMaeztu”).
Publisher Copyright:
© 2019. The American Astronomical Society.
PY - 2019/2/10
Y1 - 2019/2/10
N2 - We report the discovery of a quasar at z = 7.07, which was selected from the deep multi-band imaging data collected by the Hyper Suprime-Cam (HSC) Subaru Strategic Program survey. This quasar, HSC J124353.93+010038.5, has an order of magnitude lower luminosity than do the other known quasars at z > 7. The rest-frame ultraviolet absolute magnitude is M 1450 = -24.13 0.08 mag and the bolometric luminosity is erg s -1 . Its spectrum in the optical to near-infrared shows strong emission lines, and shows evidence for a fast gas outflow, as the C iv line is blueshifted and there is indication of broad absorption lines. The Mg ii-based black hole mass is , thus indicating a moderate mass accretion rate with an Eddington ratio . It is the first z > 7 quasar with sub-Eddington accretion, besides being the third most distant quasar known to date. The luminosity and black hole mass are comparable to, or even lower than, those measured for the majority of low-z quasars discovered by the Sloan Digital Sky Survey, and thus this quasar likely represents a z > 7 counterpart to quasars commonly observed in the low-z universe.
AB - We report the discovery of a quasar at z = 7.07, which was selected from the deep multi-band imaging data collected by the Hyper Suprime-Cam (HSC) Subaru Strategic Program survey. This quasar, HSC J124353.93+010038.5, has an order of magnitude lower luminosity than do the other known quasars at z > 7. The rest-frame ultraviolet absolute magnitude is M 1450 = -24.13 0.08 mag and the bolometric luminosity is erg s -1 . Its spectrum in the optical to near-infrared shows strong emission lines, and shows evidence for a fast gas outflow, as the C iv line is blueshifted and there is indication of broad absorption lines. The Mg ii-based black hole mass is , thus indicating a moderate mass accretion rate with an Eddington ratio . It is the first z > 7 quasar with sub-Eddington accretion, besides being the third most distant quasar known to date. The luminosity and black hole mass are comparable to, or even lower than, those measured for the majority of low-z quasars discovered by the Sloan Digital Sky Survey, and thus this quasar likely represents a z > 7 counterpart to quasars commonly observed in the low-z universe.
KW - Dark ages
KW - first stars
KW - galaxies: active
KW - galaxies: high-redshift
KW - intergalactic medium
KW - quasars: general
KW - quasars: supermassive black holes
KW - reionization
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U2 - 10.3847/2041-8213/ab0216
DO - 10.3847/2041-8213/ab0216
M3 - Article
AN - SCOPUS:85062026250
VL - 872
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
SN - 2041-8205
IS - 1
M1 - L2
ER -