Journal Article

Magnetocentrifugal launching of jets from discs around Kerr black holes

Maxim Lyutikov

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 396, issue 3, pages 1545-1552
Published in print July 2009 | ISSN: 0035-8711
Published online June 2009 | e-ISSN: 1365-2966 | DOI:
Magnetocentrifugal launching of jets from discs around Kerr black holes

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Strong magnetic fields modify particle motion in the curved space–time of spinning black holes and change the stability conditions of circular orbits. We study conditions for magnetocentrifugal jet launching from accretion discs around black holes, whereby large–scale black hole lines anchored in the disc may fling tenuous coronal gas outwards. For a Schwarzschild black hole, magnetocentrifugal launching requires that the poloidal component of magnetic fields makes an angle less than 60° to the outward direction at the disc surface, similar to the Newtonian case. For prograde rotating discs around Kerr black holes, this angle increases and becomes 90° for footpoints anchored to the disc near the horizon of a critically spinning a=M black hole. Thus, a disc around a critically spinning black hole may centrifugally launch a jet even along the rotation axis.

Keywords: black hole physics; magnetic fields; plasmas; galaxies: active

Journal Article.  3737 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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