The orbital resonance model for twin peak kHz QPOs
Abstract
Many Galactic black hole and neutron star sources in low X-ray mass binaries show QPOs (quasi periodic oscillations) in their observed X-ray fluxes, i.e. peaks in the Fourier variability power spectra. Pairs of twin peaks are observed, and in black-hole systems their frequencies (upp), (down) are in rational ratios. For example, in all four microquasars with twin peaks observed, (upp):(down) = 3:2. The rational ratios have been postulated in a model that explained twin peak QPOs as a non-linear resonance between modes of accretion disk oscillations. For those microquasars where the mass of the X-ray source is known, we determine the black-hole spin, following from the observed QPO frequencies within various models of resonance.
Cite
@article{arxiv.astro-ph/0401464,
title = {The orbital resonance model for twin peak kHz QPOs},
author = {Marek A. Abramowicz and Wlodek Kluzniak and Zdenek Stuchlik and Gabriel Torok},
journal= {arXiv preprint arXiv:astro-ph/0401464},
year = {2007}
}
Comments
8 pages, 16 figures