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@article{1786600,
author = {Suková, Petra and Zajaček, Michal and Witzany, Vojtěch and Karas, Vladimír},
article_number = {1},
doi = {http://dx.doi.org/10.3847/1538-4357/ac05c6},
keywords = {Magnetohydrodynamical simulations; Supermassive black holes; Accretion; Low-luminosity active galactic nuclei},
language = {eng},
issn = {0004-637X},
journal = {The Astrophysical Journal},
title = {Stellar Transits across a Magnetized Accretion Torus as a Mechanism for Plasmoid Ejection},
url = {https://doi.org/10.3847/1538-4357/ac05c6},
volume = {917},
year = {2021}
}
TY - JOUR
ID - 1786600
AU - Suková, Petra - Zajaček, Michal - Witzany, Vojtěch - Karas, Vladimír
PY - 2021
TI - Stellar Transits across a Magnetized Accretion Torus as a Mechanism for Plasmoid Ejection
JF - The Astrophysical Journal
VL - 917
IS - 1
SP - "43"
EP - "43"
PB - IOP Publishing Ltd.
SN - 0004637X
KW - Magnetohydrodynamical simulations
KW - Supermassive black holes
KW - Accretion
KW - Low-luminosity active galactic nuclei
UR - https://doi.org/10.3847/1538-4357/ac05c6
N2 - The close neighborhood of a supermassive black hole contains not only the accreting gas and dust but also stellar-sized objects, such as late-type and early-type stars and compact remnants that belong to the nuclear star cluster. When passing through the accretion flow, these objects perturb it by the direct action of stellar winds, as well as their magnetic and gravitational effects. By performing general-relativistic magnetohydrodynamic simulations, we investigate how the passages of a star can influence the supermassive black hole gaseous environment. We focus on the changes in the accretion rate and the emergence of blobs of plasma in the funnel of an accretion torus. We compare results from 2D and 3D numerical computations that have been started with comparable initial conditions. We find that a quasi-stationary inflow can be temporarily inhibited by a transiting star, and the plasmoids can be ejected along the magnetic field lines near the rotation axis. We observe the characteristic signatures of the perturbing motion in the power spectrum of the accretion variability, which provides an avenue for a multi-messenger detection of these transient events. Finally, we discuss the connection of our results to multiwavelength observations of galactic nuclei, with the emphasis on ten promising sources (Sgr A*, OJ 287, J0849+5108, RE J1034+396, 1ES 1927+65, ESO 253–G003, GSN 069, RX J1301.9+2747, eRO-QPE1, and eRO-QPE2).
ER -
SUKOVÁ, Petra, Michal ZAJAČEK, Vojtěch WITZANY a Vladimír KARAS. Stellar Transits across a Magnetized Accretion Torus as a Mechanism for Plasmoid Ejection. \textit{The Astrophysical Journal}. IOP Publishing Ltd., 2021, roč.~917, č.~1, s.~''43'', 31 s. ISSN~0004-637X. Dostupné z: https://dx.doi.org/10.3847/1538-4357/ac05c6.
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