Near-horizon structure of escape zones of electrically charged particles around weakly magnetized rotating black hole: Case of oblique magnetosphere

0548130 - ASÚ 2022 RIV DE eng J - Journal Article
Karas, Vladimír - Kopáček, Ondřej
Near-horizon structure of escape zones of electrically charged particles around weakly magnetized rotating black hole: Case of oblique magnetosphere.
Astronomische Nachrichten. Roč. 342, 1-2 (2021), s. 357-363. ISSN 0004-6337. E-ISSN 1521-3994.
[International Workshop on Astronomy and Relativistic Astrophysics /9./. on-line, 06.09.2020-12.11.2021]
R&D Projects: GA ČR(CZ) GC19-01137J
Institutional support: RVO:67985815
Keywords : accretion disks * black hole physics * chaos
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 0.954, year: 2021
Method of publishing: Limited access
https://doi.org/10.1002/asna.202113934

We study the effects of large-scale magnetic fields on the dynamics of charged particles near a rotating black hole. We consider a scenario in which the initially neutral particles on geodesic orbits in the equatorial plane become ionized, and hence they are destabilized by the charging process. Fraction of charged particles are then accelerated out of the equatorial plane and then follow jet-like trajectories with relativistic velocities. We explore nonaxisymmetric systems in which the magnetic field is inclined with respect to the black hole spin. We study the system numerically in order to locate the zones of escaping trajectories and compute the terminal escape velocity. By breaking the axial symmetry, we notice increasing fraction of unbound orbits which allow for acceleration to ultrarelativistic velocities.
Permanent Link: http://hdl.handle.net/11104/0324241