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Title: Discovery of the First Low-luminosity Quasar at z > 7
Author: Matsuoka, Yoshiki
Onoue, Masafusa
Kashikawa, Nobunari
Strauss, Michael A.
Iwasawa, Kazushi
Lee, Chien-Hsiu
Imanishi, Masatoshi
Nagao, Tohru
Akiyama, Masayuki
Asami, Naoko
Bosch, James
Furusawa, Hisanori
Goto, Tomotsugu
Gunn, James E.
Harikane, Yuichi
Ikeda, Hiroyuki
Izumi, Takuma
Kawaguchi, Toshihiro
Kato, Nanako
Kikuta, Satoshi
Kohno, Kotaro
Komiyama, Yutaka
Koyama, Shuhei
Lupton, Robert H.
Minezaki, Takeo
Miyazaki, Satoshi
Murayama, Hitoshi
Niida, Mana
Nishizawa, Atsushi J.
Noboriguchi, Akatoki
Oguri, Masamune
Ono, Yoshiaki
Ouch, Masami
Price, Paul A.
Sameshima, Hiroaki
Schulze, Andreas
Shirakata, Hikari
Silverman, John D.
Sugiyama, Naoshi
Tait, Philip J.
Keywords: Ionització
Forats negres (Astronomia)
Black holes (Astronomy)
Issue Date: 10-Feb-2019
Publisher: Institute of Physics (IOP)
Abstract: 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 M1450 = −24.13 ± 0.08 mag and the bolometric luminosity is ${L}_{\mathrm{bol}}\,=(1.4\pm 0.1)\,\times \,{10}^{46}$ 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 ${M}_{\mathrm{BH}}=(3.3\pm 2.0)\times {10}^{8}{M}_{\odot }$, thus indicating a moderate mass accretion rate with an Eddington ratio ${\lambda }_{\mathrm{Edd}}=0.34\pm 0.20$. 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.
Note: Reproducció del document publicat a:
It is part of: Astrophysical Journal Letters, 2019, vol. 872, num. 1
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ISSN: 2041-8205
Appears in Collections:Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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