Discovery of the First Low-luminosity Quasar at z > 7
Discovery of the First Low-luminosity Quasar at z > 7
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DOI：
10.3847/2041-8213/ab0216
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发表时间：
2019-01
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通讯作者：
Y. Matsuoka;M. Onoue;N. Kashikawa;M. Strauss;K. Iwasawa;Chien-Hsiu Lee;M. Imanishi;T. Nagao;M. Akiyama;N. Asami;J. Bosch;H. Furusawa;T. Goto;J. Gunn;Y. Harikane;H. Ikeda;T. Izumi;T. Kawaguchi;N. Kato;S. Kikuta;K. Kohno;Y. Komiyama;S. Koyama;R. Lupton;T. Minezaki;S. Miyazaki;H. Murayama;M. Niida;A. Nishizawa;Akatoki Noboriguchi;M. Oguri;Y. Ono;M. Ouchi;P. Price;H. Sameshima;A. Schulze;H. Shirakata;J. Silverman;N. Sugiyama;Philip J. Tait;M. Takada;T. Takata;Masayuki Tanaka;Ji-Jia Tang;Y. Toba;Y. Utsumi;Shiang‐Yu Wang;T. Yamashita
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作者：
Y. Matsuoka;M. Onoue;N. Kashikawa;M. Strauss;K. Iwasawa;Chien-Hsiu Lee;M. Imanishi;T. Nagao;M. Akiyama;N. Asami;J. Bosch;H. Furusawa;T. Goto;J. Gunn;Y. Harikane;H. Ikeda;T. Izumi;T. Kawaguchi;N. Kato;S. Kikuta;K. Kohno;Y. Komiyama;S. Koyama;R. Lupton;T. Minezaki;S. Miyazaki;H. Murayama;M. Niida;A. Nishizawa;Akatoki Noboriguchi;M. Oguri;Y. Ono;M. Ouchi;P. Price;H. Sameshima;A. Schulze;H. Shirakata;J. Silverman;N. Sugiyama;Philip J. Tait;M. Takada;T. Takata;Masayuki Tanaka;Ji-Jia Tang;Y. Toba;Y. Utsumi;Shiang‐Yu Wang;T. Yamashita
我们报告发现了一个z = 7.07的类星体，它是从超级凸轮（HSC）斯巴鲁战略计划调查收集的深多波段成像数据中选出的。这颗类星体名为HSC J124353.93+010038.5，它的光度比其他已知的z > 7的类星体低一个数量级。静止坐标系的紫外绝对星等为M1450 = −24.13 ± 0.08等，热光度为erg s−1。它在光学到近红外的光谱显示出强烈的发射线，并显示出快速气体流出的证据，因为C iv线是蓝移的，并且有宽吸收线的迹象。镁ii型黑洞的质量是，因此表明一个中等的质量吸积率与爱丁顿比。它是第一个z > 7的类星体，除了是迄今为止已知的第三个最遥远的类星体。它的光度和黑洞质量与斯隆数字巡天发现的大多数低z类星体相当，甚至更低，因此这个类星体可能是低z宇宙中常见的z > 7类星体的对应物。
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 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.