Work

A New Sample of $\sim$ 100 Intermediate-mass Black Holes Reaching $z \approx 1$

Year: 2026

Type: preprint

Abstract: 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

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2609.07836

Authors: Liu, Wen-Juan, Ho, Luis C., Yao, Su, Dong, Xiao-Bo, Zhao, Yaqi

Institutions: Polar Research Institute of China, Chinese Academy of Sciences, Ministry of Natural Resources, Yunnan Observatories, Peking University, National Astronomical Observatories

Language: English

Topic: Galaxies: Formation, Evolution, Phenomena

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: National Natural Science Foundation of China

Awards: G579566091, G6342778491, G7295695396

OpenAlex ID: W7212058397

Cites: 64

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Related to: 10