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@article{49345,
author = {Tursunov, Arman and Zajacek, Michal and Eckart, Andreas and Kološ, Martin and Britzen, Silke and Stuchlík, Zdeněk and Czerny, Bozena and Karas, Vladimír},
article_number = {1},
doi = {http://dx.doi.org/10.3847/1538-4357/ab980e},
keywords = {black hole physics; Galactic center; Galaxy accretion disks; Magnetic fields; Milky Way magnetic fields; Accretion},
language = {eng},
issn = {0004-637X},
journal = {Astrophysical Journal},
title = {Effect of Electromagnetic Interaction on Galactic Center Flare Components},
url = {https://iopscience.iop.org/article/10.3847/1538-4357/ab980e},
volume = {897},
year = {2020}
}
TY - JOUR
ID - 49345
AU - Tursunov, Arman - Zajacek, Michal - Eckart, Andreas - Kološ, Martin - Britzen, Silke - Stuchlík, Zdeněk - Czerny, Bozena - Karas, Vladimír
PY - 2020
TI - Effect of Electromagnetic Interaction on Galactic Center Flare Components
JF - Astrophysical Journal
VL - 897
IS - 1
SP - "99-1"-"99-22"
EP - "99-1"-"99-22"
SN - 0004637X
KW - black hole physics
KW - Galactic center
KW - Galaxy accretion disks
KW - Magnetic fields
KW - Milky Way magnetic fields
KW - Accretion
UR - https://iopscience.iop.org/article/10.3847/1538-4357/ab980e
N2 - Recently, near-infrared GRAVITY@ESO observations at 2.2 mu m announced the detection of three bright "flares" in the vicinity of the Galactic center supermassive black hole (SMBH) that exhibited orbital motion at a distance of about 6-11 gravitational radii from an similar to 4 x 10(6)Mblack hole. There are indications of the presence of a large-scale, organized component of the magnetic field at the Galactic center. Electromagnetic effects on the flare dynamics were previously not taken into account despite the relativistic motion of a plasma in magnetic field leading to the charge separation and nonnegligible net charge density in the plasma. Applying various approaches, we find the net charge number density of the flare components of the order of 10(-3)-10(-4)cm(-3), while the particles' total number density is of the order of 10(6)-10(8)cm(-3). However, even such a tiny excess of charged particles in the quasi-neutral plasma can significantly affect the dynamics of flare components, which can then lead to the degeneracy in the measurements of spin of the SMBH. Analyzing the dynamics of recent flares in the case of the rapidly rotating black hole, we also constrain the inclination angle between the magnetic field and spin axis to alpha < 50 degrees, as for larger angles, the motion of the hot spot is strongly chaotic.
ER -
TURSUNOV, Arman, Michal ZAJACEK, Andreas ECKART, Martin KOLOŠ, Silke BRITZEN, Zdeněk STUCHLÍK, Bozena CZERNY a Vladimír KARAS. Effect of Electromagnetic Interaction on Galactic Center Flare Components. \textit{Astrophysical Journal}. roč.~897, č.~1, s.~''99-1''-''99-22'', 22 s. ISSN~0004-637X. doi:10.3847/1538-4357/ab980e. 2020.
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