Speaker
Description
We present new results from a measurement of the high-energy astrophysical neutrino flux, featuring an explicit separation into the galactic and extragalactic components. We use the energy and directional information from data collected by the IceCube Neutrino Observatory to resolve the spatial structure of the Galactic plane on the sky while simultaneously measuring the isotropic astrophysical flux. The data comprise a combined sample of about 860,000 neutrino-induced muon-track events and 12,700 cascade events. For the galactic neutrino flux, we find that the CRINGE model, scaled by a factor of $2.7 \pm 0.8$, provides the best description among the models considered. A geometric model assuming homogeneous emission from the galactic disc is disfavored at the $3.1\sigma$ level, indicating an enhanced flux towards the galactic center region. Regarding the extragalactic spectrum, we confirm the recently reported change in the spectral index: a single power-law hypothesis is now excluded at $>5\sigma$ in favor of a description with curvature or a spectral break below $\sim30$ TeV.
