Modification of gamma-ray spectrum in a photon field

Details Modification of gamma-ray spectrum in a photon field Modification of gamma-ray spectrum in a photon field

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.166...17i&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 166, no. 1, April 1990, p. 17-33.

Astronomy and Astrophysics

Astrophysics

3

Background Radiation, Electron Photon Cascades, Gamma Ray Spectra, Photon Density, Galaxies, Microwave Emission, Relic Radiation

Scientific paper

The changes in the high-energy gamma-ray spectra due to electron-photon cascading in the photon field (e.g., microwave background radiation) are investigated. The propagation of gamma-rays with an initial power-law spectrum through an isotropic monoenergetic photon field is considered. Two processes of the cascade particle-photon field interaction are taken into account, namely, the photoproduction of electron-positron pairs and the inverse Compton effect. The effect of the synchrotron energy loss by cascade electrons in a magnetic field on the cascade gamma-quantum spectrum is studied. The results may be used to estimate the absorption and the variations in the shape of the spectrum of radiation from compact gamma-ray sources in the metagalaxy. The cascade characteristics have been obtained by numerically solving the cascade equations by the moment method.

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