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    On the possibility of precise determination of black hole spin in the framework of resonance models

    Zdeněk Stuchlík · 01 prosince, 2005 · Fyzika · 0 comments
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    Publication date: Dec 2005

    Abstract:
    It is highly probable that a non-linear resonance between some modes of
    oscillations in the accretion discs around black holes and neutron stars
    can play a crucial role in exciting detectable modulations of the X-ray
    flux. Detailed studies of the resonance models revealed that several of
    such non-linear resonances are possible in nearly Keplerian discs in
    strong gravity. Moreover, this idea seems to be strongly supported by
    observations – in all four microquasars showing twin peak QPOs
    (quasiperiodic oscillations), the ratio of frequency peaks is 3:2. In
    principle, using known frequencies of the twin peaks and the known mass
    of the central black hole, the black-hole spin can be determined. This
    was already done for the presently known sources and few miscellaneous
    resonance models. Details of excitation mechanisms of eventual
    resonances are still not fully explained, nevertheless one can imagine
    that not only one resonance could be excited in the accretion disc.
    Thus, if two such different resonances are present (by an accident or
    because of some causal connection), the black hole spin can be precisely
    determined independently of the knowledge of the black hole mass, for
    some specific cases discussed here.

    Authors:
    Stuchlík, Zdeněk; Török, Gabriel;

    http://adsabs.harvard.edu/abs/2005ragt.meet..253S

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