Electric Charge and Magnetic Flux on Rotating Black Holes in a Force-Free Magnetosphere

Details Electric Charge and Magnetic Flux on Rotating Black Holes in a Force-Free Magnetosphere Electric Charge and Magnetic Flux on Rotating Black Holes in a Force-Free Magnetosphere

2000-09-15

arxiv.org/abs/astro-ph/0009239v2

Mon.Not.Roy.Astron.Soc. 324 (2001) 781

Astronomy and Astrophysics

Astrophysics

11 pages, no figure, restructured with sections and revisions in abstarct and in the text, version accepted for MNRAS

Scientific paper

10.1046/j.1365-8711.2001.04401.x

The electric charge on rotating black holes is calculated to be ~ BJ in the force-free configuration of Ghosh (2000), with a horizon flux of ~ BM^2. This charge is gravitationally weak for B ~ 10^{15} G, so that the Kerr metric applies. Being similar to the electric charge of a magnetar, both electric charge and magnetic flux should be, in sign and order of magnitude, continuous during stellar collapse into a black hole. Extraction of the rotational energy from newly formed black holes may proceed by interaction with the magnetic field. Keywords:black hole physics --magnetic fields

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