Epicyclic oscillations of thick relativistic disks

0484940 - ASÚ 2018 RIV CZ eng C - Conference Paper (international conference)
Horák, Jiří - Straub, O. - Šrámková, E. - Goluchová, K. - Török, G.
Epicyclic oscillations of thick relativistic disks.
Proceedings of RAGtime 17/19: Workshops on black holes and neutron stars. Opava: Silesian University, 2017, s. 47-59. Publications of the Institute of Physics, 8. ISBN 9788075102577. ISSN 2336-5668.
[RAGtime /17.-19./. Opava (CZ), 17.11.2015-19.11.2015]
R&D Projects: GA ČR GA17-16287S
Institutional support: RVO:67985815
Keywords : black hole physics * accretion disks * oscillation
OECD category: Astronomy (including astrophysics,space science)
http://proceedings.physics.cz/images/proc17/hor2.pdf

We study epicyclic oscillations of thick relativistic tori with constant specific angular momentum distribution using the finite element numerical method. We have compared frequencies of the axisymmetric and non-axisymmetric modes with the analytic formulae obtained by Straub and Šrámková (2009) and Fragile et al. (2016). We have found excellent agreement in the case of axisymmetric radial epicyclic modes. In the case of the axisymmetric vertical epicyclic modes and non-axisymmetric modes in general, the analytic approximation agrees with numerical results only for tori of moderate thicknesses. Our analysis also revealed an instability of the thick constant angular momentum tori with respect to the radial epicyclic oscillation.
Permanent Link: http://hdl.handle.net/11104/0280063