ŠRÁMKOVÁ, Eva. Epicyclic oscillations of non-slender fluid tori around Kerr black holes. Classical and Quantum Gravity. GB - Spojené království Velké Británie a, 2009, vol. 26, No 5, 27 pp. ISSN 0264-9381.
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Basic information
Original name Epicyclic oscillations of non-slender fluid tori around Kerr black holes
Authors ŠRÁMKOVÁ, Eva.
Edition Classical and Quantum Gravity, GB - Spojené království Velké Británie a, 2009, 0264-9381.
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
Organization unit Faculty of Philosophy and Science in Opava
UT WoS 000263493200012
Keywords in English QUASI-PERIODIC OSCILLATIONS, INTEGRATED RELATIVISTIC TORI, THICK ACCRETION DISCS, AXISYMMETRICAL MODES, ANGULAR-MOMENTUM, SPACE-TIME, DISKS, DISKOSEISMOLOGY, EXCITATION, STABILITY
Tags UF
Tags International impact, Reviewed
Links LC06014, research and development project.
Changed by Changed by: Mgr. Pavlína Jalůvková, učo 25213. Changed: 14/12/2020 11:52.
Abstract
Considering epicyclic oscillations of pressure-supported perfect fluid tori orbiting Kerr black holes we examine non-geodesic (pressure) effects on the epicyclic modes properties. Using a perturbation method we derive fully general relativistic formulaefor eigenfunctions and eigenfrequencies of the radial and vertical epicyclic modes of a slightly non-slender, constant specific angular momentum torus up to second-order accuracy with respect to the torus thickness. The behaviour of the axisymmetric andlowest-order (m = +/- 1) non-axisymmetric epicyclic modes is investigated. For an arbitrary black hole spin we find that, in comparison with the (axisymmetric) epicyclic frequencies of free test particles, non-slender tori receive negative pressure corrections and thus exhibit lower frequencies.
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