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Epicyclic oscillations of fluid bodies: II. Strong gravity

Journal article
Authors Marek A Abramowicz
Omer Blaes
Jíri Horák
Wlodek Kluzniak
Paola Rebusco
Published in Classical and Quantum Gravity
Volume 23
Issue 5
Pages 1689-1696
ISSN 0264-9381
Publication year 2006
Published at Department of Physics (GU)
Pages 1689-1696
Language en
Subject categories Physical Sciences, Astronomy, Astrophysics and Cosmology


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 their observations have the potential to become an accurate probe of super-strong gravity.

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