Takahashi 2010 旋转黑洞的“极光“

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说这个也可能是伽马暴的能源机制

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Title:		Black Hole Aurora Powered by a Rotating Black Hole
Authors:		Takahashi, Masaaki; Takahashi, Rohta
Affiliation:		AA(Department of Physics and Astronomy, Aichi University of Education, Kariya, Aichi 448-8542, Japan takahasi@phyas.aichi-edu.ac.jp), AB(Cosmic Radiation Laboratory, The Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan)
Publication:		The Astrophysical Journal Letters, Volume 714, Issue 1, pp. L176-L180 (2010). (ApJL Homepage)
Publication Date:		05/2010
Origin:		IOP
ApJ Keywords:		accretion, accretion disks, black hole physics, magnetohydrodynamics: MHD, relativistic processes, shock waves
DOI:		10.1088/2041-8205/714/1/L176
Bibliographic Code:		2010ApJ...714L.176T

Abstract

We present a model for high-energy emission sources generated by a standing magnetohydrodynamical (MHD) shock in a black hole magnetosphere. The black hole magnetosphere would be constructed around a black hole with an accretion disk, where a global magnetic field could be originated by currents in the accretion disk and its corona. Such a black hole magnetosphere may be considered as a model for the central engine of active galactic nuclei, some compact X-ray sources, and gamma-ray bursts. The energy sources of the emission from the magnetosphere are the gravitational and electromagnetic energies of magnetized accreting matters and the rotational energy of a rotating black hole. When the MHD shock generates in MHD accretion flows onto the black hole, the plasma's kinetic energy and the black hole's rotational energy can convert to radiative energy. In this Letter, we demonstrate the huge energy output at the shock front by showing negative energy postshock accreting MHD flows for a rapidly rotating black hole. This means that the extracted energy from the black hole can convert to the radiative energy at the MHD shock front. When an axisymmetric shock front is formed, we expect a ring-shaped region with very hot plasma near the black hole; this would look like an "aurora." The high-energy radiation generated from there would carry to us the information for the curved spacetime due to the strong gravity.

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