Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-02-10
Publ.Astron.Soc.Jap. 55 (2003) 466-467
Astronomy and Astrophysics
Astrophysics
5 pages; accepted for publication in PASJ
Scientific paper
We have explored the ideas that parametric resonance affects nearly geodesic motion around a black hole or a neutron star, and that it may be relevant to the high frequency (twin) quasi-periodic oscillations occurring in some low-mass X-ray binaries. We have assumed the particles or fluid elements of an accretion disc to be subject to an isotropic perturbation of a hypothetical but rather general form. We find that the parametric resonance is indeed excited close to the radius where epicyclic frequencies of radial and meridional oscillations are in a 2:3 ratio. The location and frequencies of the highest amplitude excitation vary with the strength of the perturbation. These results agree with actual frequency ratios of twin kHz QPOs that have been reported in some black hole candidates, and they may be consistent also with correlation of the twin peaks in Sco X-1.
Abramowicz Marek A.
Karas Vladimir
Kluzniak Wiodzimierz
Lee Hyun Woo
Rebusco Paola
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