Energy dependent delay measurements of quasi-periodic oscillations in low-mass X-ray binaries

Astronomy and Astrophysics – Astronomy

Scientific paper

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Compton Effect, Energy Distribution, Stellar Mass, Stellar Oscillations, Time Lag, X Ray Binaries, Monte Carlo Method, Periodic Variations, Photons, Stellar Models

Scientific paper

The authors present results of Monte Carlo simulations of the Comptonization of photons in a finite spherical Comptonizing cloud. The energy dependence of the arrival times of the Comptonized photons is very different for different input photon spectra. If the delays observed in the high-frequency QPO of Cyg X-2 and GX 5-1 are the result of Comptonization, multi-channel time-delay measurements may constrain the energy of the input photons and thus provide important information on the accretion process in low-mass X-ray binaries.

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