This article is cited in 37 papers

ASTROPHYSICS AND COSMOLOGY

IceCube astrophysical neutrinos without a spectral cutoff and $10^{15}$–$10^{17}$ eV cosmic gamma radiation

O. Kalashev, S. V. Troitsky

Institute for Nuclear Research, Russian Academy of Sciences, Moscow

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 $\pi$-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 $10^{15}$–$10^{16}$ 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.

Received: 11.10.2014

Language: English

DOI: 10.7868/S0370274X14240011

 English version: Journal of Experimental and Theoretical Physics Letters, 2014, 100:12, 761–765

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