High-Frequency QPOs as a Product of Inner Disk Dynamics around Neutron Stars

Details High-Frequency QPOs as a Product of Inner Disk Dynamics around Neutron Stars High-Frequency QPOs as a Product of Inner Disk Dynamics around Neutron Stars

2012-02-08

arxiv.org/abs/1202.1681v1

AIP Conference Proceedings, Volume 1379, pp. 103-106 (2011)

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

4 pages, 2 figures, already published in AIP Conference Proceedings, Astrophysics of Neutron Stars 2010: A Conference in Honor

Scientific paper

10.1063/1.3629493

The kHz QPOs observed in a neutron star low mass X-ray binary are likely to be produced in the innermost regions of accretion disk around the neutron star. The rotational dynamics of the inner disk can be characterized by the presence of either sub-Keplerian or super-Keplerian accretion flow depending on the relative fastness of the neutron spin as compared to the Keplerian frequency at the inner disk radius. Within the magnetosphere-disk interaction model, the frequency difference between the two kHz QPOs observed in a given source can be estimated to be slightly higher than or nearly around the neutron star spin frequency if the neutron star is a slow rotator and less than the stellar spin frequency if the neutron star is a fast rotator.

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