ν production in Centaurus A and M87 from γ ray interactions with the gas and dust at the sources

Centaurus A and M87 are the closest galaxies with active galactic nuclei and TeV γ-ray emission. The existence of such TeV radiation suggests the production of a neutrino flux from the photo-hadronic interactions of the γ-photons and the gas and dust content of the active galaxies. Using a simple model of Centaurus A and M87, the corresponding ν luminosities at source and their fluxes at Earth were calculated. The neutrino fluxes associated with the aforementioned process resulted to be E²Φ_ν+ ≲ 10⁻¹³ s⁻¹ GeVcm⁻², more than 6 orders of magnitude below the modern upper limits from neutrino telescopes. It will be shown that, at high-energies, relevant for neutrino astronomy, these ν fluxes are not competitive with those fluxes derived from astrophysical scenarios involving cosmic ray acceleration.