Marek A Abramowicz et al 2006 Class. Quantum Grav. 23 1689 doi:10.1088/0264-9381/23/5/014
Epicyclic oscillations of fluid bodies: II. Strong gravity
Marek A Abramowicz1,2,3,4,5, Omer M Blaes6,3, Jíři Horák7,3, Włodek Kluźniak8,2,3 and Paola Rebusco9,3
Show affiliationsFluids 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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Issue 5 (7 March 2006)
Received 29 July 2005, in final form 16 January 2006
Published 15 February 2006
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Epicyclic oscillations of fluid bodies: II. Strong gravity
Marek A Abramowicz et al 2006 Class. Quantum Grav. 23 1689
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