Discovery of the First Low-luminosity Quasar at z > 7

被引：100

作者：

Matsuoka, Yoshiki ^{[1
]}

Onoue, Masafusa ^{[2
]}

Kashikawa, Nobunari ^{[3
,4
,5
]}

Strauss, Michael A. ^{[6
]}

Iwasawa, Kazushi ^{[7
,8
]}

Lee, Chien-Hsiu ^{[9
]}

Imanishi, Masatoshi ^{[4
,5
]}

Nagao, Tohru ^{[1
]}

Akiyama, Masayuki ^{[10
]}

Asami, Naoko ^{[11
]}

Bosch, James ^{[6
]}

Furusawa, Hisanori ^{[4
]}

Goto, Tomotsugu ^{[12
,13
]}

Gunn, James E. ^{[6
]}

Harikane, Yuichi ^{[14
,15
]}

Ikeda, Hiroyuki ^{[4
]}

Izumi, Takuma ^{[4
]}

Kawaguchi, Toshihiro ^{[16
]}

Kato, Nanako ^{[17
]}

Kikuta, Satoshi ^{[4
,5
]}

Kohno, Kotaro ^{[18
,19
]}

Komiyama, Yutaka ^{[4
,5
]}

Koyama, Shuhei ^{[1
]}

Lupton, Robert H. ^{[6
]}

Minezaki, Takeo ^{[18
]}

Miyazaki, Satoshi ^{[4
,5
]}

Murayama, Hitoshi ^{[20
]}

Niida, Mana ^{[17
]}

Nishizawa, Atsushi J. ^{[21
]}

Noboriguchi, Akatoki ^{[17
]}

Oguri, Masamune ^{[15
,19
,20
]}

Ono, Yoshiaki ^{[14
]}

Ouchi, Masami ^{[14
,20
]}

Price, Paul A. ^{[6
]}

Sameshima, Hiroaki ^{[22
]}

Schulze, Andreas ^{[4
]}

Shirakata, Hikari ^{[23
]}

Silverman, John D. ^{[20
]}

Sugiyama, Naoshi ^{[20
,24
]}

Tait, Philip J. ^{[25
]}

Takada, Masahiro ^{[20
]}

Takata, Tadafumi ^{[4
,5
]}

Tanaka, Masayuki ^{[4
,5
]}

Tang, Ji-Jia ^{[26
]}

Toba, Yoshiki ^{[26
,27
]}

Utsumi, Yousuke ^{[28
]}

Wang, Shiang-Yu ^{[26
]}

Yamashita, Takuji ^{[1
]}

机构：

[1] Ehime Univ, Res Ctr Space & Cosm Evolut, Matsuyama, Ehime 7908577, Japan

[2] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[3] Univ Tokyo, Dept Astron, Sch Sci, Tokyo 1130033, Japan

[4] Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan

[5] Grad Univ Adv Studies SOKENDAI, Dept Astron Sci, Mitaka, Tokyo 1818588, Japan

[6] Princeton Univ Observ, Peyton Hall, Princeton, NJ 08544 USA

[7] Univ Barcelona, ICREA, IEEC UB, Marti & Franques,1, E-08028 Barcelona, Spain

[8] Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti & Franques,1, E-08028 Barcelona, Spain

[9] Natl Opt Astron Observ, 950 North Cherry Ave, Tucson, AZ 85719 USA

[10] Tohoku Univ, Astron Inst, Aoba Ku, Sendai, Miyagi 9808578, Japan

[11] Seisa Univ, Hakone, Kanagawa 2500631, Japan

[12] Natl Tsing Hua Univ, Inst Astron, Hsinchu 30013, Taiwan

[13] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan

[14] Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan

[15] Univ Tokyo, Dept Phys, Grad Sch Sci, Bunkyo Ku, Tokyo 1130033, Japan

[16] Onomichi City Univ, Dept Econ Management & Informat Sci, Onomichi, Hiroshima 7228506, Japan

[17] Ehime Univ, Grad Sch Sci & Engn, Matsuyama, Ehime 7908577, Japan

[18] Univ Tokyo, Inst Astron, Mitaka, Tokyo 1810015, Japan

[19] Univ Tokyo, Res Ctr Early Universe, Tokyo 1130033, Japan

[20] Univ Tokyo, Kavli Inst Phys & Math Universe, WPI, Kashiwa, Chiba 2778583, Japan

[21] Nagoya Univ, Inst Adv Res, Chikusa Ku, Furo Cho, Nagoya, Aichi 4648602, Japan

[22] Kyoto Sangyo Univ, Koyama Astron Observ, Kita Ku, Kyoto, Japan

[23] Hokkaido Univ, Dept Cosmosci, Grad Sch Sci, Kita Ku, N10 W8, Sapporo, Hokkaido 0600810, Japan

[24] Nagoya Univ, Grad Sch Sci, Chikusa Ku, Furo Cho, Nagoya, Aichi 4648602, Japan

[25] Subaru Telescope, Hilo, HI 96720 USA

[26] Acad Sinica, Inst Astron & Astrophys, Taipei, Taiwan

[27] Kyoto Univ, Dept Astron, Sakyo Ku, Kyoto, Kyoto 6068502, Japan

[28] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94025 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2019年 / 872卷 / 01期

基金：

美国国家航空航天局; 美国国家科学基金会; 日本学术振兴会; 日本科学技术振兴机构;

关键词：

dark ages; reionization; first stars; galaxies: active; galaxies: high-redshift; intergalactic medium; quasars: general; quasars: supermassive black holes; BLACK-HOLE MASSES; REDSHIFT; EMISSION;

D O I：

10.3847/2041-8213/ab0216

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 L-bol = (1.4 +/- 0.1) x 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 IT-based black hole mass is M-BH = (3.3 +/- 2.0) x 10(8) M-circle dot, thus indicating a moderate mass accretion rate with an Eddington ratio) lambda(Edd) = 0.34 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.

引用

页数：6

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