Blandford-Znajek process as a gamma ray burst central engine

Details Blandford-Znajek process as a gamma ray burst central engine Blandford-Znajek process as a gamma ray burst central engine

1999-05-28

arxiv.org/abs/astro-ph/9905373v1

Astronomy and Astrophysics

Astrophysics

7 pages, no figure, paspconf.sty, to appear in Proceedings " Gamma Ray Bursts: The First Three Minutes", Gr\"aft{\aa}vallen, S

Scientific paper

We investigate the possibility that gamma-ray bursts are powered by a central engine consisting of a black hole with an external magnetic field supported by a surrounding disk or torus. The rotational energy of the black hole can be extracted electromagnetically as a Poynting flux, a mechanism proposed by Blandford and Znajek(1977). Recently observed magnetars indicate that some compact objects have very high magnetic fields, up to $10^{15}$ G, which is required to extract the energy within the duration of a GRB, i.e., in 1000 s or less. We demonstrate also that the Poynting flux need not be substantially dominated by the disk.

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