Monte Carlo Simulation of Comptonization in a Spherical Shell Geometry

Details Monte Carlo Simulation of Comptonization in a Spherical Shell Geometry Monte Carlo Simulation of Comptonization in a Spherical Shell Geometry

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jkas...27...45s&link_type=abstract

Journal of the Korean Astronomical Society, vol. 27, no. 1, p. 45-53

Mathematics

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2

X-Ray Spectra, X-Ray Binary, Neutron Star, Radiative Transfer

Scientific paper

We present the calculation of X-ray spectra produced through Compton scattering of soft X-ray by hot electrons in the spherical shell geometry, using fully relativistic Monte Carlo simulation. With this model, we show that the power-law component, which has been observed in the low luminosity state of low-mass X-ray binaries(LMXBs), is explained physically. From a spectral analysis, we find that spectral hardness is mainly due to the relative contribution of scattered component. In addtion, we see that Wien spectral features appear when the plasma is optically thick, especially in the high energy range, E >= 100keV. We suggest that after a number of scattering the escape probability approaches as asymptotic form depending on the geometry of the scattering medium rather than on the initial photon spectrum.

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