A Luminous Quasar at Redshift 7.642-猫眼课题宝

DOI：

10.3847/2041-8213/abd8c6

发表时间：

2021-01

期刊：

The Astrophysical Journal Letters

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

Feige Wang;Jinyi Yang;Xiaohui Fan;J. Hennawi;A. Barth;E. Bañados;F. Bian;K. Boutsia;T. Connor;F. Davies;R. Decarli;A. Eilers;E. Farina;R. Green;Linhua Jiang;Jiangtao Li;C. Mazzucchelli;R. Nanni;Jan-Torge Schindler;B. Venemans;F. Walter;Xue-bing Wu;M. Yue

遥远类星体是研究最早期超大质量黑洞形成和宇宙再电离历史的独特示踪剂。尽管做了大量的努力，但只有两个z ≥ 7.5的类星体被发现，这是由于它们的低空间密度和类星体选择中的高污染率。我们报告发现了一个z = 7.642的发光类星体，J 0313 −1806，这是迄今为止已知的最遥远的类星体。这个类星体的热光度为3.6 × 1013 L。深能级光谱观测表明，该类星体中存在一个质量为（1.6 ± 0.4）× 109 M的SMBH。如此巨大的SMBH在大爆炸后仅6.7亿年就存在，这对SMBH增长的理论模型提出了重大挑战。此外，类星体光谱在C iv和Si iv中表现出强烈的宽吸收线（BAL）特征，最大速度接近光速的20%。相对论性的BAL特征，结合强烈的蓝移CIV发射线，表明在这个系统中有一个强大的活动星系核（AGN）驱动的外流。阿塔卡马大型毫米/亚毫米阵列观测到了类星体宿主星系的尘埃连续体和[C ii]辐射，得到了7.6423 ± 0.0013的精确红移，表明类星体是由一个强烈的恒星形成星系所承载的，星星形成速率为200 M yr−1，尘埃质量为207 × 107 M。对这个再电离时代的BAL类星体的后续观测将为AGN反馈对最早的大质量星系生长的影响提供强有力的探测。

Distant quasars are unique tracers to study the formation of the earliest supermassive black holes (SMBHs) and the history of cosmic reionization. Despite extensive efforts, only two quasars have been found at z ≥ 7.5, due to a combination of their low spatial density and the high contamination rate in quasar selection. We report the discovery of a luminous quasar at z = 7.642, J0313−1806, the most distant quasar yet known. This quasar has a bolometric luminosity of 3.6 × 1013 L ⊙. Deep spectroscopic observations reveal a SMBH with a mass of (1.6 ± 0.4) × 109 M ⊙ in this quasar. The existence of such a massive SMBH just ∼670 million years after the big bang challenges significantly theoretical models of SMBH growth. In addition, the quasar spectrum exhibits strong broad absorption line (BAL) features in C iv and Si iv, with a maximum velocity close to 20% of the speed of light. The relativistic BAL features, combined with a strongly blueshifted C iv emission line, indicate that there is a strong active galactic nucleus (AGN)-driven outflow in this system. Atacama Large Millimeter/submillimeter Array observations detect the dust continuum and [C ii] emission from the quasar host galaxy, yielding an accurate redshift of 7.6423 ± 0.0013 and suggesting that the quasar is hosted by an intensely star-forming galaxy, with a star formation rate of ∼200 M ⊙ yr−1 and a dust mass of ∼7 × 107 M ⊙. Follow-up observations of this reionization-era BAL quasar will provide a powerful probe of the effects of AGN feedback on the growth of the earliest massive galaxies.

A Luminous Quasar at Redshift 7.642

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