Neutrino-emitting blazars may accelerate cosmic ray (CR) protons at the inner regions of the jet, where most of the magnetic energy is likely to be dissipated. In this picture, the spectrum of neutrinos and gamma-rays that leave the source is shaped by the soft photon fields that the parent hadrons encounter before leaving the source. We perform simulations of CR propagation, where protons emit by interactions within the acceleration region in the jet as well as with the external photon fields produced in the nucleus of the host galaxy. The jet acceleration region is modelled with 3D relativistic magnetohydrodynamics (MHD) and we base our analysis on previous results of particle acceleration by magnetic reconnection in Poynting flux-dominated MHD jets, where reconnection is driven by kink instability. The resulting spectra of CR, gamma-rays, and neutrinos that leave the source are discussed in the context of flat-spectrum radio quasars and BL Lac objects.
AGN, Particles acceleration, Neutrino emission, Magnetic reconnection