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Oct 15 – 18, 2024
Tsung-Dao Lee Institute
Asia/Shanghai timezone

Stellar Black Holes Can “Stretch” Supermassive Black Hole Accretion Disks

Oct 17, 2024, 11:50 AM
15m
Tsung-Dao Lee Institute

Tsung-Dao Lee Institute

No.1 Lisuo Road, Pudong New Area, Shanghai, China
Contribution talk Session

Speaker

Shuying Zhou (Xiamen University)

Description

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 mass is ∼108 Me, which can help explain the observed shallow spectral shape at wavelengths >5000 Å 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.

Primary author

Shuying Zhou (Xiamen University)

Presentation materials

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