ABRAMOWICZ, Pavel BAKALA, Kateřina GOLUCHOVÁ, Włodek KLUŹNIAK, Andrea KOTRLOVÁ, Zdeněk STUCHLÍK, Eva ŠRÁMKOVÁ and Gabriel TÖRÖK. Black hole spin inferred from 3:2 epicyclic resonance model of high-frequency quasi-periodic oscillations. Astronomy & Astrophysics. FR - Francouzská republika, 2015, vol. 578, June, p. "A90-1"-"A90-6", 6 pp. ISSN 0004-6361. Available from: https://dx.doi.org/10.1051/0004-6361/201425241.
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Basic information
Original name Black hole spin inferred from 3:2 epicyclic resonance model of high-frequency quasi-periodic oscillations
Authors ABRAMOWICZ, Pavel BAKALA, Kateřina GOLUCHOVÁ, Włodek KLUŹNIAK, Andrea KOTRLOVÁ, Zdeněk STUCHLÍK, Eva ŠRÁMKOVÁ and Gabriel TÖRÖK.
Edition Astronomy & Astrophysics, FR - Francouzská republika, 2015, 0004-6361.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10308 Astronomy
Confidentiality degree is not subject to a state or trade secret
WWW URL
Organization unit Faculty of Philosophy and Science in Opava
Doi http://dx.doi.org/10.1051/0004-6361/201425241
UT WoS 000357502600102
Keywords in English X-rays: binaries; black hole physics; accretion; accretion disks
Tags FÚ, GB14-37086G, GPP209-12P740
Tags International impact, Reviewed
Links GB14-37086G, research and development project. GPP209/12/P740, research and development project.
Changed by Changed by: Jan Vlha, učo 48995. Changed: 27/4/2021 09:40.
Abstract
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
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