Issues in the Blandford-Znajek Process for GRB Inner Engine

Details Issues in the Blandford-Znajek Process for GRB Inner Engine Issues in the Blandford-Znajek Process for GRB Inner Engine

1999-11-22

arxiv.org/abs/astro-ph/9911401v2

Astronomy and Astrophysics

Astrophysics

10 pages, 1 figure, 3 references added, more discussions on the magnetic field on the black hole, accepted for publication in

Scientific paper

10.1086/308937

Several issues regarding the Blandford-Znajek process are discussed to demonstrate that it can be an effective mechanism for powering the gamma ray bursts. Using a simple circuit analysis it is argued that the disk power increases the effective power of the black hole-accretion disk system, although a part of disk power can be dissipated into black hole entropy. Within the framework of the force-free magnetosphere with the strong magnetic field, the magnetically dominated MHD flow is found to support the Blandford-Znajek process and it is demonstrated that the possible magnetic repulsion by the rotating black hole will not affect the efficiency substantially.

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