Extracting Energy from Black Holes: The Relative Importance of the Blandford-Znajek Mechanism
Extracting Energy from Black Holes: The Relative Importance of the Blandford-Znajek Mechanism
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DOI：
10.1086/306777
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发表时间：
1998-09
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影响因子：
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通讯作者：
M. Livio;G. Ogilvie;J. G. I. S. S. Institute-J.-G.-I.-S.-S.-Institute-102933061;I. O. Astronomy;Cambridge
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作者：
M. Livio;G. Ogilvie;J. G. I. S. S. Institute-J.-G.-I.-S.-S.-Institute-102933061;I. O. Astronomy;Cambridge
我们批判性地评估的布兰德福德Znajek机制的动力从吸积盘美联储黑洞流出的作用。我们认为，没有理由假设穿过中心旋转黑洞的磁场与穿过盘中心区域的磁场在强度上有显著差异。在这种情况下，我们表明，从内部磁盘区域的电磁输出预计一般占主导地位，从孔。因此，黑洞的自旋（或不自旋）可能与系统预期的电磁功率输出无关。我们还指出，在一个标准的吸积盘中心的极向场的强度一般被高估，我们讨论的情况下，可能会产生更显着的中央极向场。
We critically assess the role of the Blandford-Znajek mechanism in the powering of outflows from accretion-disk-fed black holes. We argue that there is no reason to suppose that the magnetic field threading the central spinning black hole differs significantly in strength from that threading the central regions of the disk. In this case, we show that the electromagnetic output from the inner disk regions is expected in general to dominate over that from the hole. Thus the spin (or not) of the hole is probably irrelevant to the expected electromagnetic power output from the system. We also point out that the strength of the poloidal field in the center of a standard accretion disk has been generally overestimated, and we discuss scenarios that might give rise to more significant central poloidal fields.