Modelling the twin peak QPO distribution in the atoll source 4U 1636-53

Details Modelling the twin peak QPO distribution in the atoll source 4U 1636-53 Modelling the twin peak QPO distribution in the atoll source 4U 1636-53

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007ragt.meet..479t&link_type=abstract

Proceedings of RAGtime 8/9: Workshops on black holes and neutron stars, 15-19/19-21 September, 2006/2007, Hradec nad Moravicí, O

Mathematics

Probability

X-Rays: Binaries, Accretion: Accretion Disks, Stars: Neutron

Scientific paper

Relation between the lower and upper frequency mode of twin peak quasiperiodic oscilations observed in neutron star X-ray binaries is qualitatively well fitted by the frequency relation following from the relativistic precession model. Assuming this model with no preferred radius and the probability of a twin QPO excitation being uniform across the inner edge of an accretion disc, we compare the expected and observed twin peak QPO distribution in the case of atoll source 4U 1636-53. We find these two distributions highly incompatible. We also find that the observed distribution roughly corresponds to the expected one if an additional consideration of preferred resonant orbits is included. We notice that our findings are relevant for some disc-oscillation QPO models as well.

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