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It is widely believed that the central engines in active galactic nuclei are related to supermassive black holes. An axisymmetric, stationary, general-relativistic, electrodynamic engine model was formulated by Macdonald & Thorne (1982,hereafter MT), which consisted of a supermassive black hole surrounded by a plasma magnetosphere and a magnetized accretion disk. MT assumed the magnetic field line velocity to be purely toroidal, as demanded by the axisymmetry and stationarity conditions.

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It is widely believed that the central engines in active galactic nuclei are related to supermassive black holes. An axisymmetric, stationary, general-relativistic, electrodynamic engine model was formulated by Macdonald & Thorne (1982, hereafter MT) that consisted of a supermassive black hole surrounded by a plasma magnetosphere and a magnetized accretion disk. MT assumed the magnetic field line velocity to be purely toroidal, as demanded by the axisymmetry and stationarity conditions.


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