Opacity of the Universe to High-Energy Photons

Details Opacity of the Universe to High-Energy Photons Opacity of the Universe to High-Energy Photons

Mar 1967

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967phrv..155.1408g&link_type=abstract

Physical Review, vol. 155, Issue 5, pp. 1408-1411

Mathematics

Probability

123

Scientific paper

Based on observational data, the spectra of cosmic radio, microwave, infrared, optical, and x-ray photons are estimated. The absorption probability per unit path length by the process of pair production in photon-photon collisions is then computed as a function of energy for high-energy photons traversing this photon gas, using the results of the previous paper. These calculations show that there should be a dip in the intensity of the high-energy cosmic photon spectrum by about a factor of 10 between 1012 and 1013 eV due to absorption by optical (~ a few eV) photons. Above 1014 eV, the high-energy cosmic photon spectrum should essentially cut off because of the strong absorption by the cosmic 3°K blackbody photons, and at higher energies by the cosmic radio photons.

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