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@article{1824943,
author = {Karas, Vladimír and Zajaček, Michal and Kunneriath, Devaky and Dovčiak, Michal},
article_number = {1},
doi = {http://dx.doi.org/10.1016/j.asr.2021.09.012},
keywords = {Black holes; Galactic and stellar structure; Accretion; Accretion disks; Strong gravity 2000 MSC},
language = {eng},
issn = {0273-1177},
journal = {Advances in Space Research},
title = {Electromagnetic signatures of strong-field gravity from accreting black-holes},
url = {https://www.sciencedirect.com/science/article/pii/S0273117721007195},
volume = {69},
year = {2022}
}
TY - JOUR
ID - 1824943
AU - Karas, Vladimír - Zajaček, Michal - Kunneriath, Devaky - Dovčiak, Michal
PY - 2022
TI - Electromagnetic signatures of strong-field gravity from accreting black-holes
JF - Advances in Space Research
VL - 69
IS - 1
SP - 448-466
EP - 448-466
PB - Elsevier Ltd
SN - 02731177
KW - Black holes
KW - Galactic and stellar structure
KW - Accretion
KW - Accretion disks
KW - Strong gravity 2000 MSC
UR - https://www.sciencedirect.com/science/article/pii/S0273117721007195
N2 - Observations of galactic nuclei help us to test General Relativity. Whereas the No-hair Theorem states that classical, isolated black holes eventually settle to a stationary state that can be characterized by a small number of parameters, cosmic black holes are neither isolated nor steady. Instead, they interact with the environment and evolve on vastly different time-scales. Therefore, the astrophysically realistic models require more parameters, and their values likely change in time. New techniques are needed in order to allow us to obtain independent constraints on these additional parameters. In this context, non-electromagnetic messengers have emerged and a variety of novel electromagnetic observations is going to supplement traditional techniques in the near future. 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.
ER -
KARAS, Vladimír, Michal ZAJAČEK, Devaky KUNNERIATH a Michal DOVČIAK. Electromagnetic signatures of strong-field gravity from accreting black-holes. \textit{Advances in Space Research}. Elsevier Ltd, 2022, roč.~69, č.~1, s.~448-466. ISSN~0273-1177. Dostupné z: https://dx.doi.org/10.1016/j.asr.2021.09.012.
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