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Origin of the high energy neutrino flux at IceCube
- Publication Year :
- 2017
-
Abstract
- We discuss the spectrum of the different components in the astrophysical neutrino flux reaching the Earth and the possible contribution of each component to the high-energy IceCube data. We show that the diffuse flux from cosmic ray interactions with gas in our galaxy implies just 2 events among the 54 event sample. We argue that the neutrino flux from cosmic ray interactions in the intergalactic (intracluster) space depends critically on the transport parameter $\delta$ describing the energy dependence in the diffusion coefficient of galactic cosmic rays. Our analysis motivates a E^{-2.1} neutrino spectrum with a drop at PeV energies that fits well the data, including the non-observation of the Glashow resonance at 6.3 PeV. We also show that a cosmic ray flux described by an unbroken power law may produce a neutrino flux with interesting spectral features (bumps and breaks) related to changes in the cosmic ray composition.<br />Comment: 19 pages, new section about changes in CR composition, version to appear in ApJ
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.1703.10786
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.3847/1538-4357/aa9d94