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Title:
Epicyclic oscillations of fluid bodies: II. Strong gravity
Authors:
Abramowicz, Marek A.; Blaes, Omer M.; Horák, Jíri; Kluzniak, Wlodek; Rebusco, Paola
Affiliation:
AA(Department of Physics, Göteborg University, S-412-96 Göteborg, Sweden ; Copernicus Astronomical Centre, Bartycka 18, PL-00-716 Warszawa, Poland ; Nordita, Blegdamsvej 17, DK-2100 Copenhagen, Denmark ; Kavli Institute of Theoretical Physics, University of California, Santa Barbara, CA 93106-9530, USA ; Institut d'Astrophysique de Paris, UMR 7095 CNRS, Univ P & M Curie, 98 bis Bd Arago, 75014 Paris, France ), AB(Physics Department, University of California, Santa Barbara, CA 93106-9530, USA ; Nordita, Blegdamsvej 17, DK-2100 Copenhagen, Denmark ), AC(Astronomical Institute, Czech Academy of Sciences, Bocni II 1401, CZ-14131 Prague, Czech Republic ; Nordita, Blegdamsvej 17, DK-2100 Copenhagen, Denmark ), AD(Institute of Astronomy, Zielona Góra University, Wieza Braniborska, Lubuska 2, PL-65-265 Zielona Góra, Poland ; Copernicus Astronomical Centre, Bartycka 18, PL-00-716 Warszawa, Poland ; Nordita, Blegdamsvej 17, DK-2100 Copenhagen, Denmark ), AE(Max-Planck-Institute for Astrophysics, Karl-Schwarzschild-Str. 1, D-85741 Garching, Germany; Nordita, Blegdamsvej 17, DK-2100 Copenhagen, Denmark )
Publication:
Classical and Quantum Gravity, Volume 23, Issue 5, pp. 1689-1696 (2006).
Publication Date:
03/2006
Origin:
IOP
DOI:
10.1088/0264-9381/23/5/014
Bibliographic Code:
2006CQGra..23.1689A

Abstract

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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