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- W1645797004 abstract "We have compared the recent cosmic background γ-ray observations with spectra predicted by various possible cosmic interactions. We find that the observed isotropic γ-rays with energies > 1 MeV can best be explained as being due to the decay of π°-mesons produced in extragalactic cosmic-ray collisions. This interpretation indicates that extragalactic cosmic-ray sources were more active (or prevalent) in the past and started to form at a redshift of ~ 100 corresponding to 107–108 years after the ‘big-bang’.For a present extragalactic gas density of 10−7−10−5 cm−3, the present extragalactic cosmic-ray flux is inferred to be 10−5−10−3 the galactic value." @default.
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- W1645797004 date "1970-01-01" @default.
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- W1645797004 title "Possible Initial Evidence of Extragalactic Cosmic-Ray Protons and the Age of Extragalactic Cosmic-Ray Sources" @default.
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- W1645797004 doi "https://doi.org/10.1007/978-94-010-3311-4_61" @default.
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