Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233..294s&link_type=abstract
Astrophysical Journal, Part 1, vol. 233, Oct. 1, 1979, p. 294-301.
Astronomy and Astrophysics
Astronomy
19
Compton Effect, Galactic Radiation, Gamma Ray Astronomy, Interstellar Matter, Cross Sections, Electron Distribution, Electrons, Relativistic Particles
Scientific paper
The inverse Compton scattering of background photon gases by relativistic electrons is a good candidate for the production of high-energy gamma rays in the diffuse interstellar medium as well as in discrete sources. By discussing the special case of the scattering of the diffuse starlight in the interstellar medium by cosmic ray electrons, we demonstrate that previous derivations of the gamma ray source function for this process on the basis of the Thomson limit of the Klein-Nishina cross section lead to incorrect values for gamma-ray energies above 100 MeV. It is shown that the Thomson limit is not applicable for the calculation of gamma-ray source functions in astrophysical circumstances in which target photons with energies greater than 1 eV are scattered by relativistic electrons.
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