Stellar black holes can "stretch” supermassive black hole accretion disks
The Astrophysical Journal Letters(2024)
摘要
Stellar black holes (sBHs) are widely believed to exist in the accretion
disks of active galactic nuclei (AGNs). Previous studies often focus on the
transient emission produced by embedded sBHs. Here, we explore the possible
observational consequences of an AGN accretion disk that contains a population
of accreting sBHs. Embedded accreting sBHs change the effective temperature
distribution of the AGN accretion disk by heating gas in the outer regions. Two
possible observational consequences are presented. First, the spectral energy
distribution has a turnover feature at ∼ 4700 Å when the
supermassive black hole (SMBH) mass is ∼ 10^8 M_⊙, which can help
explain the observed shallow spectral shape at wavelengths >5000Å for the Sloan Digital Sky Survey quasar composite spectrum.
Second, the half-light radius of a given relatively long wavelength is
significantly larger than for an AGN disk without sBHs, which can be tested by
microlensing observations. With appropriate sBH distributions, the model can be
reconciled with quasar microlensing disk sizes. We propose that the half-light
radius-wavelength relation can be utilized to investigate the distributions of
embedded sBHs in AGN accretion disks.
更多查看译文
关键词
Black holes,Active galactic nuclei,Gravitational microlensing
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要