Axially symmetric steady-state flows in the vicinity of a Kerr black hole and the nature of the activity of galactic nuclei

A generalization of the force-free equation describing steady-state axially symmetric flows in the vicinity of a Kerr black hole is carried out to the case of ideal magnetohydrodynamics. It is shown how this equation changes from an elliptic to a hyperbolic type in the vicinity of the horizon. The limits of applicability of the approach under discussion are examined for different astrophysical sources. It is shown that a high photon density strongly restricts the limits of applicability of the MHD approach.

PACS: 98.62.Js, 95.30.Qd, 96.60.Vg, 98.54.Cm, 98.54.Aj (all)
DOI: 10.1070/PU1993v036n06ABEH002165
URL: https://ufn.ru/en/articles/1993/6/d/
Citation: Beskin V S, Par’ev V I "Axially symmetric steady-state flows in the vicinity of a Kerr black hole and the nature of the activity of galactic nuclei" Phys. Usp. 36 (6) 529–539 (1993)

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Оригинал: Бескин В С, Парьев В И «Осесимметричные стационарные течения в окрестности керровской черной дыры и природа активности галактических ядер» УФН 163 (6) 95–106 (1993); DOI: 10.3367/UFNr.0163.199306d.0095

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