SLANÝ, Petr, Zdeněk STUCHLÍK and Gabriel TÖRÖK. Humpy LNRF-velocity profiles in accretion discs orbiting rapidly rotating Kerr black holes: a possible relation to QPOs. In Proceedings of Science. Italy: International School for Advanced Studies, 2006, p. 1-5. Available from: https://dx.doi.org/10.22323/1.033.0095.
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Basic information
Original name Humpy LNRF-velocity profiles in accretion discs orbiting rapidly rotating Kerr black holes: a possible relation to QPOs
Authors SLANÝ, Petr, Zdeněk STUCHLÍK and Gabriel TÖRÖK.
Edition Italy, Proceedings of Science, p. 1-5, 5 pp. 2006.
Publisher International School for Advanced Studies
Other information
Original language English
Type of outcome Proceedings paper
Field of Study 10308 Astronomy
Confidentiality degree is not subject to a state or trade secret
Organization unit Faculty of Philosophy and Science in Opava
Doi http://dx.doi.org/10.22323/1.033.0095
Keywords in English accretion discs, black holes, relativity, instabilities
Tags FÚ, MSM4781305903, sbornik
Tags International impact
Links MSM4781305903, plan (intention).
Changed by Changed by: Mgr. Pavlína Jalůvková, učo 25213. Changed: 3/12/2020 13:29.
Abstract
Change of sign of the velocity gradient (mesured with respect to locally non-rotating frames) has been found for accretion discs orbiting rapidly rotating Kerr black holes with spin a>0.9953 for Keplerian discs and a>0.99979 for marginally stable thick discs. Such ``humpy''orbital velocity profiles occur close to but above the marginally stable circular geodesic of the black hole spacetimes. The maximal positive rate of change of the orbital velocity in terms of the proper radial distance introduces a locally defined critical frequency characterizing any processes in the disc capable to excite possible oscillations connected with the velocity hump.
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