High-Energy Neutrinos from Starburst galaxies: implications for neutrino astronomy

Abstract

Starburst and Starforming galaxies are astrophysical sources characterised by an intense star-forming activity. They are reservoirs of cosmic rays and host a high density target gas in the central region called Starburst Nucleus (SBN). In this contribution, we present the results of two model studies regarding the high-energy neutrino production. For the first one, we perform a diffuse analysis. In particular, we consider a blending of spectral indexes and obtain a multi-component description of extragalactic background light (EGB), high energy starting events (HESE) and high-energy cascade IceCube data. Remarkably, we find that, differently from recent prototype scenarios, the spectral index blending allows starburst galaxies to account for up to 40% of the HESE events at 95.4% CL and favors a maximal energy of the accelerated cosmic rays at teens of PeV. For the second one, we present a point-like analysis regarding nearby SFGs. We apply the calorimetric approach to the known SBGs within 100 Mpc, considering, were possible, a source-by-source description of the star formation rate. These results are then compared with what IceCube has observed at TeV energies as well as with what can be expected from the incoming KM3NeT and IceCube gen 2.