Electromagnetic signatures of strong-field gravity from accreting black-holes

0551411 - ASÚ 2023 RIV GB eng J - Journal Article
Karas, Vladimír - Zajaček, M. - Kunneriath, D. - Dovčiak, Michal
Electromagnetic signatures of strong-field gravity from accreting black-holes.
Advances in Space Research. Roč. 69, č. 1 (2022), s. 448-466. ISSN 0273-1177. E-ISSN 1879-1948
R&D Projects: GA ČR(CZ) GX21-06825X
Institutional support: RVO:67985815
Keywords : sagittarius-a-asterisk * active galactic nuclei * x-ray-polarization
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 2.6, year: 2022
Method of publishing: Limited access
https://doi.org/10.1016/j.asr.2021.09.012

In this outline, we summarize several fruitful aspects of electromagnetic signatures from accretion disks in strong-gravity regime in the outlook of upcoming satellite missions and ground-based telescopes. As an interesting example, we mention a purely geometrical effect of polarization angle changes upon light propagation, which occurs near the black hole event horizon. Despite that only numerical simulations can capture the accretion process in a realistic manner, simplified toy-models and semi-analytical estimates are useful to understand complicated effects of strong gravity near the event horizon of a rotating black hole, and especially within the plunging region below the innermost stable circular orbit.
Permanent Link: http://hdl.handle.net/11104/0330944