Abstract
Some generalizations of the relation between high-energy astrophysical neutrino and cosmic ray fluxes are obtained, taking into account present results on the cosmic ray spectrum and composition as well as a more realistic modeling of the Galactic and extragalactic cosmic ray components down to PeV energies. It is found that the level of neutrino fluxes measured by IceCube can be consistent with sources that are thin to escaping protons. This could also make it easier for heavier nuclei to be emitted from the sources without suffering excessive disintegration processes.
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