Constraints on Galactic Neutrino Emission with Seven Years of IceCube Data
Author(s)IceCube Collaboration; Arguelles Delgado, Carlos A; Axani, Spencer Nicholas; Collin, G. H.; Conrad, Janet Marie; Moulai, Marjon H.; ... Show more Show less
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The origins of high-energy astrophysical neutrinos remain a mystery despite extensive searches for their sources. We present constraints from seven years of IceCube Neutrino Observatory muon data on the neutrino flux coming from the Galactic plane. This flux is expected from cosmic-ray interactions with the interstellar medium or near localized sources. Two methods were developed to test for a spatially extended flux from the entire plane, both of which are maximum likelihood fits but with different signal and background modeling techniques. We consider three templates for Galactic neutrino emission based primarily on gamma-ray observations and models that cover a wide range of possibilities. Based on these templates and in the benchmark case of an unbroken E [superscript -2.5] power-law energy spectrum, we set 90% confidence level upper limits, constraining the possible Galactic contribution to the diffuse neutrino flux to be relatively small, less than 14% of the flux reported in Aartsen et al. above 1 TeV. A stacking method is also used to test catalogs of known high-energy Galactic gamma-ray sources.
DepartmentMassachusetts Institute of Technology. Department of Physics
American Astronomical Society
Aartsen, M. G. et al. “Constraints on Galactic Neutrino Emission with Seven Years of IceCube Data.” The Astrophysical Journal 849, 1 (October 2017): 67 © 2017 The American Astronomical Society
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