Constraints on Galactic Neutrino Emission with Seven Years of IceCube Data
Name
Aartsen_2017_ApJ_849_67.pdf
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1.15 MB
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Author(s)
IceCube Collaboration
Arguelles Delgado, Carlos A
Axani, Spencer Nicholas
Collin, G. H.
Conrad, Janet Marie
Moulai, Marjon H.
Date Issued
October 2017
Journal
Astrophysical Journal
Publisher
American Astronomical Society
Citation
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
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.3847/1538-4357/AA8DFB
