Mass-spin relation of black holes obtained by twin high-frequency quasi-periodic oscillations

Abstract

The paper studies the uniqueness and the monotonicity of the mass-spin relation of black holes the X-ray power density spectra of which contain twin high-frequency quasi-periodic oscillations in 3:2 ratio. It is found that for geodesic models the properties of the mass-spin relation are independent of the observed frequencies, i.e. they are independent of the particular object. Some results are valid for all geodesic models. For concreteness two of the most commonly used models are studied here: the 3 : 1 nonlinear epicyclic resonance model and its Keplerian version.

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