Mathematics – Probability
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...219..292r&link_type=abstract
Astrophysical Journal, Part 1, vol. 219, Jan. 1, 1978, p. 292-299.
Mathematics
Probability
69
Compton Effect, Iron, Radiative Transfer, X Ray Sources, X Ray Spectra, Emission Spectra, Fokker-Planck Equation, Photoionization, Stellar Models
Scientific paper
The formation of X-ray spectral features due to iron in a relatively cool cloud of gas with a Thomson depth greater than 1 surrounding a compact source of continuum X-rays is described. Coupled equations are solved for the ionization structure of the cloud and for the radiative transfer of the X-rays. Photoionization suppresses the strength of emission lines and absorption edges. Comptonization of the radiation broadens emission lines, fills in absorption edges, and produces a high-energy cutoff. In order to describe multiple scattering, a Fokker-Planck equation is derived which includes an important modification of the Kompaneets equation. Narrow resonance lines are treated with an escape probability formalism.
McCray Richard
Ross Ronald R.
Weaver Richard
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