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arXiv 0802.2041astro-ph
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暗物质在超大质量黑洞中的吸积

Dark Matter Accretion into Supermassive Black Holes

Sébastien Peirani, José Antonio De Freitas Pacheco

摘要:

重新讨论了黑洞对暗物质的相对论吸积率。假设相空间密度指示器$Q=ρ_{\infty}/σ^3_{\infty}$在流入过程中保持不变,当考虑典型的暗晕条件时,推导出的吸积率比经典的吸积公式高出5个数量级,适用于非相对论性和非相互作用的粒子.对于这些典型的条件,流动的临界点位于约30-150倍水平半径的距离处。将我们的结果应用于由宇宙学模拟产生的晕所承载的黑洞种子表明,暗物质的贡献不超过总吸积质量的~10%,证实了测热类星体的光度与黑洞的重子吸积历史有关。

英文摘要:

The relativistic accretion rate of dark matter by a black hole is revisited. Under the assumption that the phase space density indicator, $Q=ρ_{\infty}/σ^3_{\infty}$, remains constant during the inflow, the derived accretion rate can be higher up to five orders of magnitude than the classical accretion formula, valid for non-relativistic and non-interacting particles, when typical dark halo conditions are considered. For these typical conditions, the critical point of the flow is located at distances of about 30-150 times the horizon radius. Application of our results to black hole seeds hosted by halos issued from cosmological simulations indicate that dark matter contributes to no more than ~10% of the total accreted mass, confirming that the bolometric quasar luminosity is related to the baryonic accretion history of the black hole.

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