Optically thick X-ray transfer - The shell game

Details Optically thick X-ray transfer - The shell game Optically thick X-ray transfer - The shell game

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222..959l&link_type=abstract

Astrophysical Journal, Part 1, vol. 222, June 15, 1978, p. 959-966. NsG-7092.

Astronomy and Astrophysics

Astrophysics

10

Electromagnetic Wave Transmission, Optical Thickness, Radiative Transfer, Stellar Atmospheres, X Ray Absorption, X Ray Sources, Atmospheric Models, Compton Effect, Fluorescence, Fokker-Planck Equation, Line Spectra, Magnetopause, Monte Carlo Method, Pulsars

Scientific paper

This paper investigates the radiative transfer of X-rays through a shell that is optically thick to Compton scattering, surrounding a point source of continuum X-rays. The emission and absorption of X-rays due to K-shell transitions of iron are included. The calculations are done in two entirely independent ways: by Monte Carlo simulation and by solving a Fokker-Planck diffusion equation. The emergent spectra agree very well for Thomson depths of at least about 2. The validity is confirmed of the modification to the Fokker-Planck equation of Kompaneets (1957) that is required when the photon energy is large compared with the average thermal energy of the electrons. A procedure is also developed for treating models of compact X-ray sources consisting of incomplete shells.

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