Speaker
Description
A diffuse flux of astrophysical neutrinos was discovered by the IceCube Neutrino Observatory in 2013. With the detection of neutrino emission from the galactic plane in 2023, two components have now emerged: galactic and extragalactic neutrino fluxes. Both have multimessenger connections to gamma rays and cosmic rays, with implications for processes inside and outside our galaxy. This contribution summarizes several recent IceCube measurements of each flux, including new results from a joint characterization of the galactic and extragalactic components.
The focus here is on the measurements and implications of neutrinos from the galactic plane. So far, the diffuse galactic neutrino and gamma-ray data give a consistent picture of cosmic-ray diffusion within our galaxy.
Regarding the extragalactic neutrino flux, two sources have been identified, but any dominant source class remains unaccounted for. We discuss the information provided by characterizations of the extragalactic neutrino spectrum in a multimessenger context.