Simulations of flux variability of oscillating accretion fluid tori around Kerr black holes

High frequency quasi-periodic oscillations (HF QPOs) are observed in the X-ray power-density spectra (PDS) of several microquasars and low mass X-ray binaries. Many proposed QPO models are based on oscillations of accretion toroidal fluid structures orbiting in the vicinity of a compact object. We s...

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Bibliographic Details
Published in:Proceedings of the International Astronomical Union 2014-09, Vol.10 (S313), p.380-381
Main Authors: Bakala, Pavel, Goluchová, Kateřina, Šrámková, Eva, Kotrlová, Andrea, Török, Gabriel, Vincent, Frederic H., Abramowicz, Marek A.
Format: Article
Language:English
Subjects:
Accretion disks
Astronomy
Black holes
Black holes (astronomy)
Computational fluid dynamics
Contributed Papers
Double stars
Fluid flow
Fluids
Flux
Neutrinos
Oscillating
Oscillation modes
Precession
Stars & galaxies
Toruses
X-ray astronomy
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Summary:High frequency quasi-periodic oscillations (HF QPOs) are observed in the X-ray power-density spectra (PDS) of several microquasars and low mass X-ray binaries. Many proposed QPO models are based on oscillations of accretion toroidal fluid structures orbiting in the vicinity of a compact object. We study oscillating accretion tori orbiting in the vicinity of a Kerr black hole. We demonstrate that significant variation of the observed flux can be caused by the combination of radial and vertical oscillation modes of a slender, polytropic, perfect fluid, non-self-graviting torus with constant specific angular momentum. We investigate two combinations of the oscillating modes corresponding to the direct resonance QPO model and the modified relativistic precession QPO model.
ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921315002525