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Where are the IceCube neutrinos coming from? (part 2)

24 Jul 2017, 13:00 UTC
Where are the IceCube neutrinos coming from? (part 2)
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Title: Constraints on Galactic Neutrino Emission with Seven Years of IceCube DataAuthors: The IceCube CollaborationStatus: Submitted to the Astrophysical Journal, [open access]Back in 2013, the IceCube Collaboration published a paper announcing their discovery of astrophysical neutrinos, i.e. ones that have an origin outside our Solar System (Astrobites coverage). Since this discovery, scientists have been busily working to develop theories as to the origin of these neutrinos. The original paper noted some clustering in the area of the center of our Galaxy, but it was not statistically significant. Since then, both Galactic and extragalactic origins have been proposed. Star-forming galaxies have been suggested as one possible origin, which Astrobites has covered papers arguing both for and against (here and here). Other theories involve radio galaxies, transients, and dark matter.In today’s paper, the IceCube Collaboration has analyzed more of their data and set limits on the percentage of the diffuse neutrino flux that can come from Galactic sources. Theoretically, some neutrinos should be created in the Galactic plane: we know that this area emits gamma rays from pion decay, and neutrinos are created in the same types of interactions that create the gamma rays.The collaboration used an unbinned maximum likelihood method as ...

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