# Stunted accretion growth of black holes by combined effect of the flow angular momentum and radiation feedback

Kazuyuki Sugimura, Takashi Hosokawa, Hidenobu Yajima, Kohei Inayoshi, Kazuyuki Omukai

21 被引用数 (Scopus)

## 抄録

Accretion on to seed black holes (BHs) is believed to play a crucial role in formation of supermassive BHs observed at high-redshift (z > 6). Here, we investigate the combined effect of gas angular momentum and radiation feedback on the accretion flow, by performing 2D axially symmetric radiation hydrodynamics simulations that solve the flow structure across the Bondi radius and the outer part of the accretion disc simultaneously. The accreting gas with finite angular momentum forms a rotationally supported disc inside the Bondi radius, where the accretion proceeds by the angular momentum transport due to assumed α-type viscosity. We find that the interplay of radiation and angular momentum significantly suppresses accretion even if the radiative feedback is weakened in an equatorial shadowing region. The accretion rate is O(α) ~ O(0.01-0.1) times the Bondi value, where α is the viscosity parameter. By developing an analytical model, we show that such a great reduction of the accretion rate persists unless the angular momentum is so small that the corresponding centrifugal radius is ≳ 0.04 times the Bondi radius. We argue that BHs are hard to grow quickly via rapid mass accretion considering the angular momentum barrier presented in this paper.

本文言語 English 3961-3975 15 Monthly Notices of the Royal Astronomical Society 478 3 https://doi.org/10.1093/MNRAS/STY1298 Published - 2018 8 1

• 天文学と天体物理学
• 宇宙惑星科学

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