Joint constraints on Galactic diffuse neutrino emission from ANTARES and IceCube

TL;DR

This study combines ten years of ANTARES and seven years of IceCube data to search for diffuse Galactic neutrino emission, constraining cosmic ray models but finding no significant excess.

Contribution

It presents the first joint analysis of ANTARES and IceCube data for Galactic neutrino emission, setting new limits on cosmic ray production models.

Findings

No significant neutrino excess detected.

Limits start constraining Galactic cosmic ray models.

Joint analysis improves sensitivity over individual datasets.

Abstract

The existence of diffuse Galactic neutrino production is expected from cosmic ray interactions with Galactic gas and radiation fields. Thus, neutrinos are a unique messenger offering the opportunity to test the products of Galactic cosmic ray interactions up to energies of hundreds of TeV. Here we present a search for this production using ten years of ANTARES track and shower data, as well as seven years of IceCube track data. The data are combined into a joint likelihood test for neutrino emission according to the KRA$_\gamma$ model assuming a 5 PeV per nucleon Galactic cosmic ray cutoff. No significant excess is found. As a consequence, the limits presented in this work start constraining the model parameter space for Galactic cosmic ray production and transport.