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@inproceedings{37906,
author = {Zajaček, Michal and Tursunov, Arman and Eckart, Andreas and Britzen, Silke and Hackmann, Eva and Karas, Vladimír and Stuchlík, Zdeněk and Czerny, Bozena and Zensus, Anton J.},
address = {neuvedeno},
booktitle = {Journal of Physics: Conference Series. Volume 1258, Issue 1, 21 October 2019, Article number 012031. 1st Sharjah International Conference on Particle Physics, Astrophysics and Cosmology, FISICPAC 2018; University of SharjahSharjah; United Arab Emirates; 11 November 2018 through 13 November 2018; Code 153573},
doi = {http://dx.doi.org/10.1088/1742-6596/1258/1/012031},
editor = {Al Naimiy H. M. K.; Attaelmanan A. G.; Ellis J.; Nasri S.; Eckart A.; Elmehdi H. M.; Soualah R.},
keywords = {Galactic centre black hole; Sgr A*; electrically charged black holes; astrophysical processes},
howpublished = {tištěná verze "print"},
language = {eng},
location = {neuvedeno},
pages = {"012031-1"-"012031-17"},
publisher = {Institute of Physics Publishing},
title = {Constraining the charge of the Galactic centre black hole},
url = {https://iopscience.iop.org/article/10.1088/1742-6596/1258/1/012031},
year = {2019}
}
TY - JOUR
ID - 37906
AU - Zajaček, Michal - Tursunov, Arman - Eckart, Andreas - Britzen, Silke - Hackmann, Eva - Karas, Vladimír - Stuchlík, Zdeněk - Czerny, Bozena - Zensus, Anton J.
PY - 2019
TI - Constraining the charge of the Galactic centre black hole
PB - Institute of Physics Publishing
CY - neuvedeno
KW - Galactic centre black hole
KW - Sgr A*
KW - electrically charged black holes
KW - astrophysical processes
UR - https://iopscience.iop.org/article/10.1088/1742-6596/1258/1/012031
L2 - https://iopscience.iop.org/article/10.1088/1742-6596/1258/1/012031
N2 - In this contribution, we summarize our results concerning the observational constraints on the electric charge associated with the Galactic centre black hole - Sgr A*. According to the no-hair theorem, every astrophysical black hole, including supermassive black holes, is characterized by at most three classical, externally observable parameters - mass, spin, and the electric charge. While the mass and the spin have routinely been measured by several methods, the electric charge has usually been neglected, based on the arguments of efficient discharge in astrophysical plasmas. From a theoretical point of view, the black hole can attain charge due to the mass imbalance between protons and electrons in fully ionized plasmas, which yields about ~ 10^8 C for Sgr A*. The second, induction mechanism concerns rotating Kerr black holes embedded in an external magnetic field, which leads to electric field generation due to the twisting of magnetic field lines. This electric field can be associated with the induced Wald charge, for which we calculate the upper limit of ~ 10^(15) C for Sgr A*. Although the maximum theoretical limit of ~ 10^(15) C is still 12 orders of magnitude smaller than the extremal charge of Sgr A*, we analyse a few astrophysical consequences of having a black hole with a small charge in the Galactic centre. Two most prominent ones are the effect on the X-ray bremsstrahlung profile and the effect on the position of the innermost stable circular orbit.
ER -
ZAJAČEK, Michal, Arman TURSUNOV, Andreas ECKART, Silke BRITZEN, Eva HACKMANN, Vladimír KARAS, Zdeněk STUCHLÍK, Bozena CZERNY a Anton J. ZENSUS. Constraining the charge of the Galactic centre black hole. In Al Naimiy H. M. K.; Attaelmanan A. G.; Ellis J.; Nasri S.; Eckart A.; Elmehdi H. M.; Soualah R. \textit{Journal of Physics: Conference Series. Volume 1258, Issue 1, 21 October 2019, Article number 012031. 1st Sharjah International Conference on Particle Physics, Astrophysics and Cosmology, FISICPAC 2018; University of SharjahSharjah; United Arab Emirates; 11 November 2018 through 13 November 2018; Code 153573}. neuvedeno: Institute of Physics Publishing, 2019, s.~''012031-1''-''012031-17'', 17 s. ISSN~1742-6588. Dostupné z: https://dx.doi.org/10.1088/1742-6596/1258/1/012031.
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