Constraining the charge of the Galactic centre black hole

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19240%2F19%3AA0000565" target="_blank" >RIV/47813059:19240/19:A0000565 - isvavai.cz</a>

Result on the web

<a href="https://iopscience.iop.org/article/10.1088/1742-6596/1258/1/012031" target="_blank" >https://iopscience.iop.org/article/10.1088/1742-6596/1258/1/012031</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1742-6596/1258/1/012031" target="_blank" >10.1088/1742-6596/1258/1/012031</a>

Result language

angličtina

Original language name

Constraining the charge of the Galactic centre black hole

Original language description

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.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/EF16_027%2F0008521" target="_blank" >EF16_027/0008521: Support of International Mobility of Researchers on SU</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

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

ISBN

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ISSN

1742-6588

e-ISSN

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Number of pages

17

Pages from-to

„012031-1“-„012031-17“

Publisher name

Institute of Physics Publishing

Place of publication

neuvedeno

Event location

University of Sharjah, United Arab Emirates

Event date

Nov 11, 2018

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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