发现首个红移大于 7 的低光度类星体
星系天体物理
2019-10-07 v1
摘要
我们报道一个位于 z = 7.07 的类星体的发现，其选自 Hyper Suprime-Cam (HSC) Subaru Strategic Program 巡天所采集的深场多波段成像数据。该类星体 HSC J124353.93+010038.5 的光度比其他已知 z > 7 类星体低一个数量级。其静止帧紫外绝对星等为 M1450 = -24.13 +/- 0.08 mag，热光度 Lbol = (1.4 +/- 0.1) x 10^{46} erg/s。其光学至近红外光谱显示强发射线，并显示出快速气体外流的迹象，表现为 C IV 线蓝移且存在宽吸收线指示。基于 Mg II 的黑洞质量为 Mbh = (3.3 +/- 2.0) x 10^8 Msun，因而表明具有 0.34 +/- 0.20 的 Eddington 比率所对应的中等质量吸积率。它是首个具有亚 Eddington 吸积的 z > 7 类星体，同时也是迄今已知的第三遥远类星体。其光度与黑洞质量可与 Sloan Digital Sky Survey 发现的大多数低红移类星体相当甚至更低，因此该类星体很可能代表了低红移宇宙中常见类星体的 z > 7 对应体。
引用
@article{arxiv.1901.10487,
title = {Discovery of the First Low-Luminosity Quasar at z > 7},
author = {Yoshiki Matsuoka and Masafusa Onoue and Nobunari Kashikawa and Michael A. Strauss and Kazushi Iwasawa and Chien-Hsiu Lee and Masatoshi Imanishi and Tohru Nagao and Masayuki Akiyama and Naoko Asami and James Bosch and Hisanori Furusawa and Tomotsugu Goto and James E. Gunn and Yuichi Harikane and Hiroyuki Ikeda and Takuma Izumi and Toshihiro Kawaguchi and Nanako Kato and Satoshi Kikuta and Kotaro Kohno and Yutaka Komiyama and Shuhei Koyama and Robert H. Lupton and Takeo Minezaki and Satoshi Miyazaki and Hitoshi Murayama and Mana Niida and Atsushi J. Nishizawa and Akatoki Noboriguchi and Masamune Oguri and Yoshiaki Ono and Masami Ouchi and Paul A. Price and Hiroaki Sameshima and Andreas Schulze and Hikari Shirakata and John D. Silverman and Naoshi Sugiyama and Philip J. Tait and Masahiro Takada and Tadafumi Takata and Masayuki Tanaka and Ji-Jia Tang and Yoshiki Toba and Yousuke Utsumi and Shiang-Yu Wang and Takuji Yamashita},
journal= {arXiv preprint arXiv:1901.10487},
year = {2019}
}
备注
Accepted for publication in ApJ Letters