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VOLUME 100 (2014) | ISSUE 12 | PAGE 865
IceCube astrophysical neutrinos without a spectral cutoff and 1015 -1017 eV cosmic gamma radiation
DOI: 10.7868/S0370274X14240011
Abstract
We present a range of unbroken power-law fits to the astrophysical-neutrino spectrum consistent with the most recent published IceCube data at the 68 π-mesons, we estimate accompanying gamma-ray fluxes for various distributions of sources, taking propagation effects into account. We then briefly discuss existing experimental results constraining PeV to EeV diffuse gamma-ray flux and their systematic uncertainties. Several scenarios are marginally consistent both with the KASKADE and CASA-MIA upper limits at 1015-1016 eV and with the EAS-MSU tentative detection at {\sim} 10^{17} eV, given large systematic errors of the measurements. Future searches for the diffuse gamma-ray background at sub-PeV to sub-EeV energies just below present upper limits will give a crucial diagnostic tool for distinguishing between the Galactic and extragalactic models of the origin of the IceCube events.