Neutrino production in starburst galaxies

AGUSTÍN M. CARULLI; MATÍAS M. REYNOSO

Rosario

Congreso; 62ª Reunión Anual de la Asociación Argentina de Astronomía; 2020

Understanding the origin of the diffuse flux of high-energy astrophysical neutrinos detected byIceCube has become a challenging issue within present High Energy Astrophysics. In this work, we present a model to explore the potential neutrino production of starburst galaxies (SBG) by considering three different neutrino production zones that can be associated to a typical single SBG. The first zone is the nucleus, where due to the high rate of supernova explosions, a significant amount of protons can be accelerated to high energies and undergo pp interactions with the interstellar medium. The second zone we consider is the corresponding to the superwind, which is formed by the hot gas that escapes from the nucleus and interacts with the intergalactic medium (IGM) generating shocks. Protons accelerated there can undergo both pp interactions with the ambient matter, and also pγ collisions with photons from the cosmic microwave background (CMB) at different redshifts. The third neutrino production zone we consider, is an external one, where we account for the possibility that protons escaping from the whole system interact with the CMB. Finally, adding the neutrino contributions of the three zones, we calculate the diffuse neutrino flux by integration on the redshift range appropriate for SBG