5–9 May 2025
CAMK
Europe/Warsaw timezone

Acceleration and plunge near a rotating black hole

6 May 2025, 15:15
15m
sala wykładowa (CAMK)

sala wykładowa

CAMK

ul. Bartycka 18, Warsaw, Poland
Standard talk Accretion Tuesday afternoon

Speaker

Vladimir Karas (Astronomical Institute of the Czech Academy of Sciences)

Description

We explore off-equatorial acceleration of electrically charged matter near a magnetized black hole with the aim of understanding the boundaries between the regions of stable, plunging, and escaping motion. As a generalisation of the Innermost Stable Circular Orbit (ISCO), the concept of the radius of the Innermost Stable Spherical Orbit (ISSO) determines the inner rim of inclined accretion/ejection process. We demonstrate that the region of bound orbits has a complicated structure due to enhanced precession in strong gravity. We also explore the fate of particles launched in the near-horizon region: these may either plunge into the event horizon or accelerate to very high energy towards radial infinity (cf. The Astrophysical Journal, Volume 966, id.226, 2024; https://arxiv.org/abs/2404.04501).

Primary author

Vladimir Karas (Astronomical Institute of the Czech Academy of Sciences)

Co-author

Dr Ondrej Kopacek (Technical University of Liberec)

Presentation materials

There are no materials yet.