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

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

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238..333b&link_type=abstract

Black Holes from Stars to Galaxies -- Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #

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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 same frequencies at which the fluid actually oscillate. Using numerical ray-tracing we show that strong gravity has a substantial effect on light modulation and may itself be responsible for significant part of variations in observed lightcurves.

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