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- W1992093247 abstract "The association of the origin of cosmic rays with the extragalactic radio sources yields an average intergalactic energy density not greatly different from the value measured for cosmic rays in the vicinity of the Earth, i.e. it may be as high as about 10-12 erg cm-3. Both the radio sources and the cosmic rays probably arise from violent events in the nuclei of galaxies. Although it is possible that the energy spectrum of cosmic rays may arise directly in the violent events themselves, the characteristic spectrum dE/E-r (r = 2.5 to 3) can also be due to the operation of a Fermi process on an extragalactic scale. It is shown that, provided the rate of energy gain for the whole cosmic ray distribution is greater than the rate at which energy is injected, and provided the process reaches a steady state, the spectral index must lie between 2 and 3. An upper limit to the particle energies is to be expected when Larmor radii become comparable with the dimensions of the accelerating elements. This condition, applied to a particle energy of the order of 1020 eV, leads to a dimension of about 10 megaparsec, if the acceleration process is extragalactic in origin." @default.
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- W1992093247 date "1964-07-01" @default.
- W1992093247 modified "2023-10-14" @default.
- W1992093247 title "On cosmic rays as an extragalactic phenomenon" @default.
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- W1992093247 doi "https://doi.org/10.1088/0370-1328/84/1/318" @default.
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