Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-03-21
Class.Quant.Grav.25:095011,2008
Astronomy and Astrophysics
Astrophysics
16 pages, 7 figures, accepted in Class. Quantum Grav. (2008)
Scientific paper
10.1088/0264-9381/25/9/095011
Near a black hole or an ultracompact star, motion of particles is governed by strong gravitational field. Electrically charged particles feel also electromagnetic force arising due to currents inside the star or plasma circling around. We study a possibility that the interplay between gravitational and electromagnetic action may allow for stable, energetically bound off-equatorial motion of charged particles. This would represent well-known generalized Stormer's 'halo' orbits, which have been discussed in connection with the motion of dust grains in planetary magnetospheres. We demonstrate that such orbits exist and can be astrophysically relevant when a compact star or a black hole is endowed with a dipole-type magnetic field. In the case of Kerr-Newman solution, numerical analysis shows that the mutually connected gravitational and electromagnetic fields do not allow existence of stable halo orbits above the outer horizon of black holes. Such orbits are either hidden under the inner black-hole horizon, or they require the presence of a naked singularity.
Karas Vladimir
Kovar Jiri
Stuchlik Zdenek
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