Opacity of the Universe to High-Energy Photons
- 25 March 1967
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 155 (5), 1408-1411
- https://doi.org/10.1103/physrev.155.1408
Abstract
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 and eV due to absorption by optical (∼ a few eV) photons. Above 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.
Keywords
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