约100个中等质量黑洞的新样本，红移达 $z \approx 1$
A New Sample of $\sim$ 100 Intermediate-mass Black Holes Reaching $z \approx 1$
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中文总结 AI 辅助
利用DESI DR1数据，通过定量光谱分解和宽H$\beta$选源，在 $0.5<z\lesssim1$ 处识别出98个中等质量黑洞AGN，发现其吸积更极端且电离气体运动学有系统变化，为IMBH演化提供新约束。
中文摘要 AI 辅助
我们利用DESI DR1数据，对 $0.5 < z \lesssim 1$ 范围内的中等质量黑洞（IMBH）活动星系核（AGN）进行了系统性搜寻。通过定量光谱分解和宽H$\beta$选源，我们识别出98个黑洞质量 $M_\mathrm{BH}<10^6$ $M_{\odot}$ 的宽线IMBH AGN。该样本的黑洞质量范围为 $M_\mathrm{BH}=10^{5.5}-10^{6.0}$ $M_{\odot}$，爱丁顿比率介于1.2至9.0之间，将系统性IMBH AGN搜寻扩展到了中等红移。与一致选源的 $z<0.6$ IMBH样本相比，$0.5<z<1$ 的源具有更高的宽H$\beta$光度和显著更高的爱丁顿比率，表明在更早的宇宙时期存在更极端的吸积状态。它们还表现出更宽的[O III]轮廓和更强的蓝移翼成分，这些运动学差异在匹配黑洞质量和爱丁顿比率后仍然存在。这些结果揭示了 $z<1$ 处IMBH AGN演化的两个显著特征：IMBH向更高红移时能达到越来越极端的吸积状态，以及其电离气体运动学的系统性变化。前者表明IMBH的快速（包括超爱丁顿）增长可以持续到相对较晚的宇宙时期，而后者可能指示活跃增长的IMBH其电离气体环境和相关外流活动的演化。综合来看，这些发现为 $z<1$ 处IMBH的演化路径提供了新的约束，并表明种子质量黑洞在宇宙黎明之后很久仍能继续快速增长。
英文摘要
We present a systematic search for intermediate-mass black hole (IMBH) active galactic nuclei (AGNs) at $0.5 < z \lesssim 1$ using DESI DR1 spectroscopy.We identify 98 broad-line IMBH AGNs with black hole masses $M_\mathrm{BH}<10^6$ $M_{\odot}$ through quantitative spectral decomposition and broad-H$β$ selection. This sample spans $M_\mathrm{BH}=10^{5.5}-10^{6.0}$ $M_{\odot}$ and Eddington ratios from 1.2 to 9.0 extending systematic IMBH AGN searches to intermediate redshift. Compared with a consistently selected $z<0.6$ IMBH sample, the $0.5<z<1$ sources reach higher broad-H$β$ luminosities and substantially higher Eddington ratios, indicating more extreme accretion states at earlier cosmic times. They also show broader [O III] profiles and stronger blueshifted wing components, with these kinematic differences persisting after matching in black hole mass and Eddington ratio. These results reveal two distinct signatures of evolution among IMBH AGNs at $z<1$: ability of IMBHs to reach increasingly extreme accretion states toward higher redshift, and systematic changes in their ionized-gas kinematics. The former demonstrates that rapid, including super-Eddington, growth of IMBHs can persist to relatively late cosmic times, while the latter may indicate evolution in the ionized-gas environment and associated outflow activity of actively growing IMBHs. Together, these findings provide new constraints on the evolutionary pathways of IMBHs at $z<1$, and show that seed-mass black holes can continue to undergo rapid growth well after the cosmic dawn.
发表机构
- Yunnan Observatories, Chinese Academy of Sciences（中国科学院云南天文台）
- Key Laboratory for Polar Science, Ministry of Natural Resources, Polar Research Institute of China（自然资源部极地科学重点实验室，中国极地研究中心）
- Kavli Institute for Astronomy and Astrophysics, Peking University（北京大学科维理天文与天体物理研究所）
- Department of Astronomy, School of Physics, Peking University（北京大学物理学院天文学系）
- National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）
- Department of Astronomy, University of Science and Technology of China（中国科学技术大学天文学系）
- Polar Research Institute of China（中国极地研究中心）
机构由 AI 辅助整理，请以论文原文为准。
