Feb 18 – 26, 2021
Europe/Rome timezone

Reservoir Sources Contribution to the astrophysical Neutrino Flux

Feb 22, 2021, 12:05 PM
Room 2 (https://unipd.link/NeuTel-ParallelRoom2)

Room 2


Parallel Flash talk Neutrino Telescopes and Multimessenger Astrophysical Models


Antonio Ambrosone (Istituto Nazionale di Fisica Nucleare)


Starburst Galaxies are known as “reservoirs” of high-energy cosmic rays which potentially could contribute to the astrophysical diffuse neutrino flux measured by IceCube. In this work, we go beyond the standard prototype-based approach, and investigate a model based on a data-driven blending of spectral indexes, thereby capturing the observed changes in the properties of individual emitters. We then perform a multi-messenger analysis considering the extragalactic gamma-ray background (EGB) measured by Fermi-LAT and the IceCube data samples. Remarkably, we find that, the spectral index blending allows starburst galaxies to account for up to 40% of the HESE events at 95.4 % C.L., while satisfying the limit on the non-blazar EGB component. In broad terms, our analysis points out that a better modeling of astrophysical sources could alleviate the tension between neutrino and gamma-ray data interpretation.

Primary author

Antonio Ambrosone (Istituto Nazionale di Fisica Nucleare)


Marco Chianese (NA) Damiano Fiorillo (Istituto Nazionale di Fisica Nucleare) Antonio Marinelli (PI) Gennaro Miele (Università di Napoli "Federico II") Ofelia Pisanti (Università di Napoli "Federico II")

Presentation materials