发表机构
Waseda University; University of Tokyo; Johns Hopkins University; Ehime University; Wuhan University; Princeton University; National Institutes of Natural Sciences; Graduate University for Advanced Studies (SOKENDAI); Kagoshima University; Japan Aerospace Exploration Agency (JAXA); Massachusetts Institute of Technology; University of Toronto; Dunlap Institute for Astronomy and Astrophysics; National Tsing Hua University; Peking University; Max Planck Institute for Astronomy; University of Toyama（早稻田大学; 东京大学; 约翰斯·霍普金斯大学; 爱媛大学; 武汉大学; 普林斯顿大学; 国立自然科学研究所; 综合研究大学院大学; 鹿儿岛大学; 日本宇宙航空研究开发机构; 麻省理工学院; 多伦多大学; 邓普天文学与天体物理学研究所; 国立清华大学; 北京大学; 马克斯·普朗克天文学研究所; 富山大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用 JWST/NIRSpec 和 Subaru/MOIRCS 光谱，测量了 21 个中等光度高红移类星体的黑洞质量与爱丁顿比率，发现其吸积速率较快但不及最亮类星体，支持反层次增长模型。
AI 中文摘要
我们展示了利用 JWST/NIRSpec 和 Subaru/MOIRCS 获得的 21 个红移 6.07 < z < 6.90 类星体的近红外光谱。这些目标的紫外绝对星等为 -25 < M_1450 < -22，选自 Subaru 高红移低光度类星体探索（SHELLQs）项目中识别出的 z>6 类星体样本。这些类星体处于明亮类星体与 JWST 发现的暗弱高红移活动星系核之间的中等光度区间。我们分别从 NIRSpec 和 MOIRCS 目标中探测到了宽巴尔默发射线和 MgII 2798 及其连续谱。该样本的维里黑洞质量范围广泛，为 7.2 < log M_BH/M_sun < 9.4，爱丁顿比率为 -1.3 < log L_bol/L_Edd < 0.4。将这些测量结果与我们之前对其他 SHELLQs 类星体的质量估计相结合，我们构建了一个包含 27 个在 6 < z < 7 范围内具有 M_BH 估计值的类星体样本，并推导了 M_BH 和 L_bol/L_Edd 的分布。与红移 z ~ 1.3 的光度匹配类星体相比，我们发现高红移样本的中位数偏移为 delta log M_BH/M_sun = -0.4 和 Delta log L_bol/L_Edd = 0.2。此外，11% 的高红移类星体正在接近或超过爱丁顿极限吸积。作为系统性检验，采用基于爱丁顿比率的单历元 M_BH 估计校准后，推断的超爱丁顿比例增加到 22%。这些结果表明，具有代表性的遥远超大质量黑洞群体正在经历快速吸积阶段，尽管其极端程度不如最明亮类星体群体，这与超大质量黑洞的反层次增长情景一致。
英文摘要
We present near-infrared spectroscopy of 21 quasars at 6.07 < z < 6.90 obtained with JWST/NIRSpec and Subaru/MOIRCS. These targets have absolute ultraviolet magnitudes of -25 < M_1450 < -22 and are drawn from a sample of z>6 quasars identified in the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project. These quasars occupy the intermediate-luminosity regime between luminous quasars and the faint high-redshift AGNs uncovered by JWST. We detect broad Balmer emission lines and MgII 2798 with underlying continua from the NIRSpec and MOIRCS targets, respectively. The virial black hole masses of this sample span a wide range of 7.2 < log M_BH/M_sun < 9.4, with Eddington ratios of -1.3 < log L_bol/L_Edd < 0.4. Combining these measurements with our previous mass estimates for other SHELLQs quasars, we construct a sample of 27 quasars with M_BH estimates at 6 < z < 7 and derive the distributions of M_BH and L_bol/L_Edd. When compared with luminosity-matched quasars at z ~ 1.3, we find median offsets of delta log M_BH/M_sun = -0.4 and Delta log L_bol/L_Edd = 0.2 in the high-redshift sample. In addition, 11% of the high-redshift quasars are accreting near or above the Eddington limit. As a systematic check, adopting the Eddington-ratio-dependent calibration of single-epoch M_BH estimates increases the inferred super-Eddington fraction to 22%. These results indicate that a representative population of distant supermassive black holes undergo a rapid accretion phase, although not as extreme as that seen in the most luminous quasar population, consistent with the anti-hierarchical growth scenario of supermassive black holes.
Comments36 pages, 16 figures, submitted to ApJ
