Statistics – Computation
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.227p...7s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 227, July 15, 1987, p. 7P-12P.
Statistics
Computation
28
Oscillations, Periodic Variations, Photon-Electron Interaction, Radiant Flux Density, Time Lag, X Ray Sources, Compton Effect, Computational Astrophysics, Electron Energy, Molecular Clouds, Monte Carlo Method, Optical Thickness
Scientific paper
The authors show that the delay (of the order of ms) between the quasi-periodic oscillations (QPO), observed from Cyg X-2 and GX 5-1, in a high-energy and a low-energy photon pass-band, can be the result of Compton scattering of photons in a cloud of hot electron gas. This delay depends on the optical depth, electron temperature, and radius of the cloud, and on the spectrum of the input photons. Using Monte Carlo simulations the authors show how, for an assumed input spectrum of photons, the observed delay and X-ray spectrum can be used to constrain the size of the scattering cloud. The authors find that, in addition to scattering of an oscillating signal in a constant cloud, scattering of a constant source of input photons through a cloud with oscillating optical depth can also give rise to both QPO in the emergent photons, and a time lag between high-energy and low-energy photons.
Hasinger Guenter
Lewin Walter H. G.
Paradijs Jan van
Stollman G. M.
van der Klis Michael
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