Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...335..786z&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 335, Dec. 15, 1988, p. 786-802.
Astronomy and Astrophysics
Astrophysics
85
Background Radiation, Electron Photon Cascades, Electron-Positron Pairs, Elementary Particles, Gamma Ray Spectra, Black Body Radiation, Compton Effect, Electron Scattering, Radiation Distribution
Scientific paper
The problem of high-energy gamma-rays and electrons entering an isotropic background radiation field is considered. The gamma-rays produce electron-positron pairs by photon-photon interactions with the background photons, and the electrons Compton upscatter the background photons, giving rise to a pair-photon cascade. The Compton interactions are in the quantum Klein-Nishina regime. The spectra of the secondary produced gamma-rays are obtained in the case of large optical depths of the radiation field by solving a kinetic equation of the cascade. This process can be important for the early universe, gamma-ray bursts, jets, active galactic nuclei, and ultra-high-energy gamma-rays and electrons crossing the cosmic microwave background.
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