Dominance of Galactic diffuse neutrino flux over the extragalactic diffuse flux

Ascertain whether there exists any energy interval in which the Galactic diffuse high-energy neutrino flux exceeds the extragalactic diffuse neutrino flux by performing higher-sensitivity, model-independent measurements of the Galactic plane neutrino spectrum.

Background

The first observation of the Milky Way in high-energy neutrinos opens the way to dissecting Galactic versus extragalactic contributions to the diffuse neutrino sky. Current sensitivity limits require template-based analyses, but future measurements aim at model-independent spectra and maps.

Determining if and where the Galactic diffuse component overtakes the extragalactic component would clarify cosmic-ray production and propagation in the Galaxy and refine multimessenger connections with gamma rays.