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arXiv 1102.2456astro-ph.HE
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超临界吸积流使黑洞旋转

Spinning up black holes with super-critical accretion flows

Aleksander Sadowski, Michal Bursa, Marek Abramowicz, Wlodek Kluzniak, Jean-Pierre Lasota, Rafal Moderski, Mohammadtaher Safarzadeh

摘要:

研究了在较宽的吸积率范围内,细长盘吸积黑洞的自旋过程。结果表明,对于超爱丁顿吸积率和较低的粘性参数α(\lesssim 0.01),无量纲自旋参数a * 的极限值可以达到高于Thorne(1974)在其开创性研究中所推断的a *=0.9978的值。对于\mdot =10 \mdot_{Edd}和α =0.01,在a_*=0.9994处达到自旋平衡。我们发现,平衡自旋值强烈依赖于α的假设值。我们还证明,对于高吸积率,捕获的辐射对自旋演化的影响可以忽略不计。

英文摘要:

We study the process of spinning up black holes by accretion from slim disks in a wide range of accretion rates. We show that for super-Eddington accretion rates and low values of the viscosity parameter alpha (\lesssim 0.01) the limiting value of the dimensionless spin parameter a_* can reach values higher than a_*=0.9978 inferred by Thorne (1974) in his seminal study. For \mdot=10\mdot_{Edd} and alpha=0.01 spin equilibrium is reached at a_*=0.9994. We show that the equilibrium spin value depends strongly on the assumed value of alpha. We also prove that for high accretion rates the impact of captured radiation on spin evolution is negligible.

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