Magnetic layers and neutral points near rotating black hole

Details Magnetic layers and neutral points near rotating black hole Magnetic layers and neutral points near rotating black hole

2008-11-11

arxiv.org/abs/0811.1772v1

Class. Quantum Grav. 26 (2009) 025004 (9pp)

Astronomy and Astrophysics

Astrophysics

10 pages, 3 figures, Classical and Quantum Gravity accepted

Scientific paper

10.1088/0264-9381/26/2/025004

Magnetic layers are narrow regions where the field direction changes sharply. They often occur in the association with neutral points of the magnetic field. We show that an organised field can produce these structures near a rotating black hole, and we identify them as potential sites of magnetic reconnection. To that end we study the field lines affected by the frame-dragging effect, twisting the magnetic structure and changing the position of neutral points. We consider oblique fields in vacuum. We also include the possibility of translational motion of the black hole which may be relevant when the black hole is ejected from the system. The model settings apply to the innermost regions around black holes with the ergosphere dominated by a super-equipartition magnetic field and loaded with a negligible gas content.

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