Total and Jet Blandford-Znajek Power in the Presence of an Accretion Disk
- 12 August 2005
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 630 (1), L5-L8
- https://doi.org/10.1086/468184
Abstract
Rotating black holes probably power ultrarelativistic jets in gamma-ray bursts, relativistic jets from some active galactic nuclei, and jets from some black hole X-ray binaries. Prior estimates of the power output of a black hole have assumed an infinitely thin disk and a magnetic field based upon a slowly rotating black hole and have not self-consistently determined the geometry or magnitude of the magnetic field for a realistic accretion disk. We provide useful formulae for the total and jet Blandford-Znajek (BZ) power and efficiency as determined self-consistently from general relativistic magnetohydrodynamic numerical models. Of all jet mechanisms, we suggest that only the BZ mechanism is able to produce an ultrarelativistic jet.Keywords
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