J 2022

Large-scale magnetic fields enabling fitting of the high-frequency QPOs observed around supermassive black holes

STUCHLÍK, Zdeněk, Martin KOLOŠ a Arman TURSUNOV

Základní údaje

Originální název

Large-scale magnetic fields enabling fitting of the high-frequency QPOs observed around supermassive black holes

Autoři

STUCHLÍK, Zdeněk (203 Česká republika, domácí), Martin KOLOŠ (203 Česká republika, domácí) a Arman TURSUNOV (860 Uzbekistán, domácí)

Vydání

Publications Of The Astronomical Society Of Japan, JP - Japonsko, 2022, 0004-6264

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Kód RIV

RIV/47813059:19630/22:A0000178

Organizační jednotka

Fyzikální ústav v Opavě

DOI

http://dx.doi.org/10.1093/pasj/psac066

UT WoS

000851853200001

Klíčová slova anglicky

black hole physics; magnetic fields; quasars: supermassive black holes; X-rays: binaries

Štítky

, RIV23

Příznaky

Mezinárodní význam, Recenzováno

Návaznosti

GA19-03950S, projekt VaV.
Změněno: 30. 1. 2023 12:13, Mgr. Pavlína Jalůvková

Anotace

V originále

Recently, it has been argued that the high-frequency quasi-periodic oscillations (QPOs) observed in black hole systems of various scales in mass in cases of supermassive black holes (SMBH) are not consistent with any of the simple physical models, based on frequencies of the geodesic epicyclic motion (Smith et al. , ApJ, 906, 92). We test if such a disease can be simply cured by geodesic models based on epicyclic frequencies modified by the effect of electromagnetic interaction of slightly charged orbiting matter, with large-scale magnetic fields with values observed around SMBHs in active nuclei. Inspired by GRAVITY/ESO observations, we assume a slightly charged hot spot, as the relativistic motion of a plasma in magnetic field leads to charge separation and non-negligible charge density in the orbiting plasma. Its electromagnetic interaction with the large-scale magnetic field around the black hole can be weak enough, allowing for nearly harmonic epicyclical oscillatory motion of the hot spot with frequencies given by modification of those applied in the geodesic model. Even the simplest epicyclic resonance variant of the geodesic model, modified by slight electromagnetic interaction admitted by observations, can fit the QPOs in the case of both stellar-mass and supermassive black holes. We have shown that even a tiny excess of charged particles in the quasi-neutral plasma of the radiating hot spot, allowed by observations, enable an explanation of QPOs observed in active galactic nuclei. We also estimate the effect of the electromagnetic interaction on the shift of the innermost stable circular orbits, implying the degeneracy in the measurements of spins of the black hole candidates.
Zobrazeno: 24. 12. 2024 17:35