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Where is the electric current driven in the Blandford-Znajek process?

Published online by Cambridge University Press:  23 June 2017

Kenji Toma  and
Fumio Takahara
Kenji Toma
Affiliation:
Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai 980-8578, Japan; email: toma@astr.tohoku.ac.jp
Fumio Takahara
Affiliation:
Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan
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Abstract

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The Blandford-Znajek process, the steady electromagnetic energy extraction from a rotating black hole, is widely believed to work for driving relativistic jets, although it is still under debate where the electric current is driven. We address this issue analytically by investigating the time-dependent state in the Boyer-Lindquist and Kerr-Schild coordinate systems. This analysis suggests that a non-ideal magnetohydrodynamic region is required in the time-dependent state, while not in the steady state.

Keywords

black hole physicsMHDplasmasgalaxies: jetsgamma rays: bursts

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