Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-09-08
Astrophys.J.512:100-104,1999
Astronomy and Astrophysics
Astrophysics
5 pages, to be published in the Astrophysical Journal
Scientific paper
10.1086/306777
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 discuss scenarios which might give rise to more significant central poloidal fields.
Livio Mario
Ogilvie Gordon I.
Pringle James E.
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