J
2015
Black hole spin inferred from 3:2 epicyclic resonance model of high-frequency quasi-periodic oscillations
ABRAMOWICZ, Pavel BAKALA, Kateřina GOLUCHOVÁ, Włodek KLUŹNIAK, Andrea KOTRLOVÁ et. al.
Základní údaje
Originální název
Black hole spin inferred from 3:2 epicyclic resonance model of high-frequency quasi-periodic oscillations
Vydání
Astronomy & Astrophysics, FR - Francouzská republika, 2015, 0004-6361
Další údaje
Typ výsledku
Článek v odborném periodiku
Utajení
není předmětem státního či obchodního tajemství
Organizační jednotka
Filozoficko-přírodovědecká fakulta v Opavě
Klíčová slova anglicky
X-rays: binaries; black hole physics; accretion; accretion disks
Příznaky
Mezinárodní význam, Recenzováno
Návaznosti
GB14-37086G, projekt VaV. GPP209/12/P740, projekt VaV.
V originále
Estimations of black hole spin in the three Galactic microquasars GRS 1915+105, GRO J1655-40, and XTE J1550-564 have been carried out based on spectral and timing X-ray measurements and various theoretical concepts. Among others, a non-linear resonance between axisymmetric epicyclic oscillation modes of an accretion disc around a Kerr black hole has been considered as a model for the observed high-frequency quasi-periodic oscillations (HF QPOs). Estimates of spin predicted by this model have been derived based on the geodesic approximation of the accreted fluid motion. Here we assume accretion flow described by the model of a pressure-supported torus and carry out related corrections to the mass-spin estimates. We find that for dimensionless black holespin a equivalent to cJ/GM^2 less than or similar to 0.9, the resonant eigenfrequencies are very close to those calculated for the geodesic motion. Their values slightly grow with increasing torus thickness. These findings agree well wit
Zobrazeno: 25. 12. 2024 08:20