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IceCube astrophysical neutrinos without a spectral cutoff and 1015–1017 eV cosmic gamma radiation

  • Astrophysics and Cosmology
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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% confidence level. Assuming that the neutrinos originate in decays of 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 10152–1016 eV and with the EAS-MSU tentative detection at ∼1017 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.

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Authors and Affiliations

  1. Institute for Nuclear Research, Russian Academy of Sciences, Moscow, 117312, Russia

    O. Kalashev & S. Troitsky

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  1. O. Kalashev
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  2. S. Troitsky
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Correspondence to S. Troitsky.

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Kalashev, O., Troitsky, S. IceCube astrophysical neutrinos without a spectral cutoff and 1015–1017 eV cosmic gamma radiation. Jetp Lett. 100, 761–765 (2015). https://doi.org/10.1134/S0021364014240072

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