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arXiv · 1703.09721

The Galactic Contribution to IceCube's Astrophysical Neutrino Flux

Peter B. Denton·Danny Marfatia·Thomas J. Weiler
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Abstract

High energy neutrinos have been detected by IceCube, but their origin remains a mystery. Determining the sources of this flux is a crucial first step towards multi-messenger studies. In this work we systematically compare two classes of sources with the data: Galactic and extragalactic. We assume that the neutrino sources are distributed according to a class of Galactic models. We build a likelihood function on an event by event basis including energy, event topology, absorption, and direction information. We present the probability that each high energy event with deposited energy $E_{\rm dep}>60$ TeV in the HESE sample is Galactic, extragalactic, or background. For Galactic models considered the Galactic fraction of the astrophysical flux has a best fit value of $1.3\%$ and is $<9.5\%$ at 90\% CL. A zero Galactic flux is allowed at $<1\sigma$.

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Peter B. Denton, Danny Marfatia, Thomas J. Weiler. 2017-03-28. The Galactic Contribution to IceCube's Astrophysical Neutrino Flux. https://doi.org/10.1088/1475-7516%2F2017%2F08%2F033

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