Comptonization and emission spectrum of X-ray sources - Monte Carlo calculations

Details Comptonization and emission spectrum of X-ray sources - Monte Carlo calculations Comptonization and emission spectrum of X-ray sources - Monte Carlo calculations

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pazh....5..279p&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 5, June 1979, p. 279-284.) Soviet Astronomy Letters, vol. 5, May-June 1979, p. 149-152.

Astronomy and Astrophysics

Astronomy

4

Compton Effect, Emission Spectra, Monte Carlo Method, Relativistic Plasmas, X Ray Sources, X Ray Spectra, Iron, Low Frequencies, Metal Ions, Photoabsorption

Scientific paper

Comptonization of LF radiation in a weakly relativistic plasma is calculated by a Monte Carlo method for electron energies (kTe) of 50, 100, and 256 keV and photon energies of 0.5 eV and 1.5 keV. It is found that the radiation intensity falls off in the LF range, that the X-rays have a power-law spectrum up to a photon energy of approximately 3kTe, and that a Wien spectrum with a mean energy of kTe tends to develop at kTe = 100 keV in the case where the optical depth equals 5. For an optical depth equal to 3, spectral indices of 0.65, 0.35, and 0.1 are obtained for kTe = 50, 100, and 256 keV, respectively. A semiempirical relation for determining the spectral index is proposed, and a possible X-ray burst mechanism is considered. Photoabsorption and Comptonization in a relatively cool plasma cloud containing a hard X-ray source at its center are also examined, with photoabsorption by iron atoms and weakly ionized iron ions taken into account.

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