Epicyclic oscillations of fluid bodies Paper II. Strong gravity

Details Epicyclic oscillations of fluid bodies Paper II. Strong gravity Epicyclic oscillations of fluid bodies Paper II. Strong gravity

2005-11-12

arxiv.org/abs/astro-ph/0511375v1

Class.Quant.Grav.23:1689-1696,2006

Astronomy and Astrophysics

Astrophysics

submitted to Classical and Quantum Gravity

Scientific paper

10.1088/0264-9381/23/5/014

Fluids in external gravity may oscillate with frequencies characteristic of the epicyclic motions of test particles. We explicitly demonstrate that global oscillations of a slender, perfect fluid torus around a Kerr black hole admit incompressible vertical and radial epicyclic modes. Our results may be directly relevant to one of the most puzzling astrophysical phenomena -- high (hundreds of hertz) frequency quasiperiodic oscillations (QPOs) detected in X-ray fluxes from several black hole sources. Such QPOs are pairs of stable frequencies in the 3/2 ratio. It seems that they originate a few gravitational radii away from the black hole and thus observations of them have the potential to become an accurate probe of super-strong gravity.

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