黑洞、圆盘和喷流共生系统的最大自旋和能量转换效率
Maximal spin and energy conversion efficiency in a symbiotic system of black hole, disk and jet
摘要：
研究了一个适用于超大质量黑洞的黑洞-吸积盘-磁层-喷流共生的组合模型.我们量化的质量和自旋的演变，我们分析了如何限制值的自旋参数和吸积质量到辐射的转换效率取决于电磁辐射反应，磁层特性和辐射截断半径的相互作用。主导效应来自闭合的磁场线区域，其将自旋极限值降低到~0.89（在其不存在时为~0.99）。因此，对黑洞自旋的观测可能有利于或不利于闭合磁场线区域（或其与磁盘的耦合）的存在。我们还发现，从观测推断，从吸积盘的最里面的部分的辐射的抑制，和一个准直喷流都增加了自旋极限和能量转换效率。
英文摘要：
We study a combined model of black hole - accretion disk - magnetosphere - jet symbiosis, applicable for supermassive black holes. We quantify the mass and spin evolution and we analyze how the limiting value of the spin parameter and the conversion efficiency of accreted mass into radiation depend on the interplay of electromagnetic radiation reaction, magnetosphere characteristics and truncation radius of radiation. The dominant effect comes from the closed magnetic field line region, which reduces the spin limit to values ~0.89 (instead ~0.99 in its absence). Therefore observations on black hole spins could favour or disfavour the existence of the closed magnetic field line region (or its coupling to the disk). We also find that the suppression of radiation from the innermost part of the accretion disk, inferred from observations, and a collimated jet both increase the spin limit and the energy conversion efficiency.
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