An axisymmetric nonstationary model of the central engine in an active galactic nucleus. I - Black hole electrodynamics

Astronomy and Astrophysics – Astronomy

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Active Galactic Nuclei, Astronomical Models, Black Holes (Astronomy), Electrodynamics, Accretion Disks, Angular Velocity, Lines Of Force

Scientific paper

In a previous paper the authors analyzed an axisymmetric, nonstationary model of the central engine of an active galactic nucleus, consisting of a supermassive black hole surrounded by a magnetized accretion disk. The equations used were the equations of power output and angular momentum loss given by Macdonald and Thorne (1982), in which an axisymmetric, stationary model is described. In this paper, all the fundamental equations in a fully time-dependent manner and the electrodynamics of a black hole and its magnetosphere is investigated. Under the assumption that the mass accretion is confined to the equatorial plane of the black hole, the results suggest that, at the equatorial zone of the black hole, the angular velocity of the magnetic field lines anchored on the accreting matter must be close to that of the black hole.

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