Počet záznamů: 1  

Twin peak quasi-periodic oscillations as signature of oscillating cusp torus

  1. 1.
    0471579 - ASÚ 2017 RIV GB eng J - Článek v odborném periodiku
    Török, G. - Goluchová, K. - Horák, Jiří - Šrámková, E. - Urbanec, M. - Pecháček, T. - Bakala, P.
    Twin peak quasi-periodic oscillations as signature of oscillating cusp torus.
    Monthly Notices of the Royal Astronomical Society. Roč. 457, č. 1 (2016), L19-L23. ISSN 0035-8711. E-ISSN 1365-2966
    Grant CEP: GA MŠMT(CZ) LH14049
    Institucionální podpora: RVO:67985815
    Klíčová slova: accretion discs * equation of state * neutron stars
    Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika
    Impakt faktor: 4.961, rok: 2016

    Serious theoretical effort has been devoted to explain the observed frequencies of twin-peak quasi-periodic oscillations (HF QPOs) observed in low-mass X-ray neutron star binaries. Here we propose a new model of HF QPOs. Within its framework we consider an oscillating torus with cusp that changes location r(0) of its centre around radii very close to innermost stable circular orbit. The observed variability is assigned to global modes of accreted fluid motion that may give strong modulation of both accretion disc radiation and the accretion rate. For a given space-time geometry, the model predicts that QPO frequencies are function of single parameter r(0). We illustrate that the model can provide fits of data comparable to those reached by other models, or even better. In particular, it is compared to relativistic precession model. Moreover, we also illustrate that the model consideration is compatible with consideration of models of a rotating neutron star in the atoll source 4U 1636-53.
    Trvalý link: http://hdl.handle.net/11104/0268947

     
     
Počet záznamů: 1  

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