@article{4cb53128be304689a86302cfbe79c419,
title = "A quasar discovered at redshift 6.6 from Pan-STARRS1",
abstract = "Luminous high-redshift quasars can be used to probe of the intergalactic medium in the early universe because their UV light is absorbed by the neutral hydrogen along the line of sight. They help us to measure the neutral hydrogen fraction of the high-z universe, shedding light on the end of reionization epoch. In this paper, we present a discovery of a new quasar (PSO J006.1240+39.2219) at redshift z = 6.61 ± 0.02 from Panoramic Survey Telescope & Rapid Response System 1. Including this quasar, there are nine quasars above z > 6.5 up to date. The estimated continuum brightness is M1450 = −25.96 ± 0.08. PSO J006.1240+39.2219 has a strong Ly α emission compared with typical low-redshift quasars, but the measured near-zone region size is RNZ = 3.2 ± 1.1 proper megaparsecs, which is consistent with other quasars at z ∼ 6.",
keywords = "Dark ages, First stars, Quasars: general, Quasars: individual, Reionization",
author = "Tang, {Ji Jia} and Tomotsugu Goto and Youichi Ohyama and Chen, {Wen Ping} and Fabian Walter and Bram Venemans and Chambers, {Kenneth C.} and Eduardo Ba{\~n}ados and Roberto Decarli and Xiaohui Fan and Emanuele Farina and Chiara Mazzucchelli and Nick Kaiser and Magnier, {Eugene A.}",
note = "Funding Information: We thank the anonymous referee for many insightful comments. We acknowlege L.Cowie for useful discussion. The Pan-STARRS1 Surveys (PS1) have been made possible through contributions by 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, the 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, and 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 Grant No. AST-1238877, the University of Maryland, Eotvos Lorand University (ELTE), and the Los Alamos National Laboratory. TG acknowledges the support by the Ministry of Science and Technology (MoST) of Taiwan through grant National Science Council (NSC) 103-2112-M-007-002-MY3 and 105-2112-M-007-003-MY3, and Youichi Ohyama acknowledges the support by the MoST of Taiwan through grant NSC 100-2112-M-001-001-MY3, 104-2112-M-001-034-and 105-2112-M-001-024-. We thank Dr Ekaterina Koptelova for the assistance in the observation. Publisher Copyright: {\textcopyright} 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society",
year = "2017",
month = may,
day = "1",
doi = "10.1093/mnras/stw3287",
language = "English (US)",
volume = "466",
pages = "4568--4572",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "4",
}