Quasiperiodic oscillations and Tomimatsu-Sato δ = 2 space-time

Abstract

We model the spacetime of low-mass X-ray binaries with the Tomimatsu-Sato δ = 2 (TS2) metric and study the properties of the orbital and the epicyclic frequencies. The numerical analysis shows that the properties of the characteristic frequencies of oscillation do not differ qualitatively from those of the Kerr black hole. Estimates for the angular momenta of the three stellar mass black hole candidates GRO 1655-40, XTE 1550-564 and GRS 1915+105 are made with the application of the nonlinear resonance model. We find agreement between the predictions based on the 3 : 2 nonlinear resonance model for a TS2 background and the current estimates found in the literature.

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• Quasi-periodic oscillations from the accretion disk around distorted black holes
• Testing Gravity with Black Hole X-Ray Data
• Extended mass and spheroidal deformation effects on epicyclic frequencies and periapsis shift in quasi-circular orbits
• Multi-resonance orbital model applied to high-frequency quasi-periodic oscillations observed in Sgr A*