Use of ANTARES and IceCube data to constrain a single power-law neutrino flux

Understand

We perform the first statistical combined analysis of the diffuse neutrino flux observed by ANTARES (nine-year) and IceCube (six-year) by assuming a single astrophysical power-law flux.

• The combined analysis reduces by a few percent the best-fit values for the flux normalization and the spectral index.
• Both data samples show an excess in the same energy range (40--200 TeV), suggesting the presence of a second component.
• We perform a goodness-of-fit test to scrutinize the null assumption of a single power-law, scanning different values for the spectral index.