Stochastic modeling of kHz quasi-periodic oscillation light curves

Details Stochastic modeling of kHz quasi-periodic oscillation light curves Stochastic modeling of kHz quasi-periodic oscillation light curves

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...452..383v&link_type=abstract

Astronomy and Astrophysics, Volume 452, Issue 2, June III 2006, pp.383-386

Astronomy and Astrophysics

Astrophysics

10

Methods: Data Analysis, Methods: Statistical, X-Rays: Binaries, Relativity, Accretion, Accretion Disks

Scientific paper

Aims.Kluźniak & Abramowicz explain the high frequency, double peak, "3:2" QPOs observed in neutron star and black hole sources in terms of a non-linear parametric resonance between radial and vertical epicyclic oscillations of an almost Keplerian accretion disk. The 3:2 ratio of epicyclic frequencies occurs only in strong gravity. Recently, a simple model incorporating their suggestion was studied analytically: the result is that a small forcing may indeed excite the parametric 3:2 resonance. However, no explanation has been provided on the nature of the forcing which is given an "ad hoc" deterministic form. Methods: .In the present paper the same model is considered. The equation are numerically integrated, dropping the ad hoc forcing and adding instead a stochastic term to mimic the action of the very complex processes that occur in accretion disks as, for example, MRI turbulence. Results: .We demonstrate that the presence of the stochastic term is able to trigger the resonance in epicyclic oscillations of nearly Keplerian disks, and it influences their pattern.

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