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Modulation of high-frequency quasi-periodic oscillations by relativistic effects

Published online by Cambridge University Press:  01 August 2006

Michal Bursa
Michal Bursa*
Affiliation:
Astronomical Institute, Academy of Sciences, Boční II, CZ-14131 Prague, Czech Republic email: bursa@astro.cas.cz
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Abstract

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Two distinct frequencies are often present in frequency power spectra of low-mass X-ray binary lightcurves. These frequencies are closely related to each other and there is a strong evidence that they have origin in the orbital motion in an accretion disc. A mechanism has to be in act that provides a modulation of emergent flux at observed frequencies – not necessarily the actual frequencies at which the fluid oscillates. Using numerical ray-tracing we show that strong gravity has an effect on light modulation and may itself be responsible for significant part of variations in observed lightcurves.

Keywords

Accretion disks – gravitational lensing – X-rays: binaries

References

Abramowicz, M. A., Blaes, O. M., Horák, J., Kluźniak, W. & Rebusco, P. 2006, Classical and Quantum Gravity, 23, 1689Google Scholar
Bursa, M. 2006, High-frequency quasi-periodic oscillations and their modulation by relativistic effects, PhD Thesis (Charles University, Prague)Google Scholar
Esin, A. A., Narayan, R., Cui, W., Grove, J. E. & Zhang, S.-N. 1998, ApJ, 505, 854CrossRefGoogle Scholar