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    Super-spinning compact objects and models of high-frequency quasi-periodic oscillations observed in Galactic microquasars. II. Forced resonances

    Zdeněk Stuchlík · Listopad 01, 2017 · Fyzika · 0 comments
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    Publication date: Nov 2017

    Abstract:
    In our previous work (Paper I) we applied several models of high-
    frequency quasi-periodic oscillations (HF QPOs) to estimate the spin of
    the central compact object in three Galactic microquasars assuming the
    possibility that the central compact body is a super-spinning object (or
    a naked singularity) with external spacetime described by Kerr geometry
    with a dimensionless spin parameter a ≡ cJ/GM2 > 1. Here
    we extend our consideration, and in a consistent way investigate
    implications of a set of ten resonance models so far discussed only in
    the context of a < 1. The same physical arguments as in Paper I are
    applied to these models, I.e. only a small deviation of the spin
    estimate from a = 1, a ≳ 1, is assumed for a favoured model. For five of
    these models that involve Keplerian and radial epicyclic oscillations we
    find the existence of a unique specific QPO excitation radius.
    Consequently, there is a simple behaviour of dimensionless frequency M ×
    νU(a) represented by a single continuous function having
    solely one maximum close to a ≳ 1. Only one of these models is
    compatible with the expectation of a ≳ 1. The other five models that
    involve the radial and vertical epicyclic oscillations imply the
    existence of multiple resonant radii. This signifies a more complicated
    behaviour of M × νU(a) that cannot be represented by single
    functions. Each of these five models is compatible with the expectation
    of a ≳ 1.

    Authors:
    Kotrlová, A.; Šrámková, E.; Török, G.; Stuchlík, Z.; Goluchová, K.;

    https://ui.adsabs.harvard.edu/abs/2017A&A…607A..69K

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