LogoLogo
  • Bio
  • Fyzika
  • V médiích
  • Fotografie
  • Výstavy
  • Kontakt

    Multi-resonance models of QPOs

    Zdeněk Stuchlík · Prosinec 01, 2007 · Fyzika · 0 comments
    0

    Publication date: Dec 2007

    Abstract:
    Using known frequencies of the accretion disc twin peak quasiperiodic
    oscillations (QPOs) and the known mass of the central black hole, the
    black hole dimensionless spin a can be determined, assuming a concrete
    version of the orbital resonance model. However, because of large range
    of observationally limited values of the black hole mass, its spin can
    be estimated with a low precision only. Higher precision of the black
    hole spin measurement is possible in the framework of multi-resonance
    model of QPOs inspired by complex high-frequency QPO patterns observed
    in some black hole and neutron star systems. In the simple orbital
    resonance models we determine the spin and mass dependence of the twin
    peak frequencies for non-linear resonances of oscillations with the
    epicyclic and Keplerian frequencies or their combinations in the case of
    a general rational frequency ratio n : m, n > m. In the
    multi-resonant model, the twin peak resonances are combined properly to
    give the observed frequency set. The multi-resonant model is proposed in
    three distinct versions. In the first one, related probably to the
    neutron star binary systems, more instances of one resonance occur at
    more specific radii. In the second case, more resonances are sharing one
    specific radius, allowing for "cooperative" resonant phenomena in the
    field of black holes with a specific value of spin. In the third
    ("ugly") case, more resonances occur at more specific radii; we restrict
    our attention to the case of two such resonant radii. For special values
    of the spin, only triple-set of frequencies is observed because of
    coincidence of some frequencies, allowing determination of the spin from
    the triple frequency ratio set. The spin is determined precisely, but
    not uniquely as the same frequency set could be relevant for more than
    one concrete spin and combination of resonant oscillations.

    Authors:
    Stuchlík, Zdeněk; Kotrlová, Andrea; Török, Gabriel;

    http://adsabs.harvard.edu/abs/2007ragt.meet..363S

      Facebook   Pinterest   Twitter   Google+

    Leave a Comment! Zrušit odpověď na komentář

    You must be logged in to post a comment.
    Archivy
    Copyright © 2016 Zdeněk Stuchlík