The Uv Drag on Hadronic Hot Jets as the Origin of X-ray Irradiation in Agn

In this paper I calculate the anisotropic ux of cascade radiation produced by an isotropic distribution of highly relativistic protons immersed in the photon eld of a spatially separated point source. Most radiation is produced towards the source of the target photons. An astrophysical application of this result is X-ray irradiation of AGN accretion disks by highly dissipative nuclear jets. Low Mach number jets convert a large fraction of their kinetic power into relativistic particles via resonance with MHD turbulence. Consequently, these jets do not show up as radio jets on large scales. Protons can easily reach high energies by stochastic acceleration in the turbulent jet plasma, whereas severe energy losses make it very diicult for the electrons to be accelerated at all. Proton acceleration saturates at the threshold energy for photo-production of secondary particles in the radiation eld of the inner accretion disk. The energetic secondaries initiate an anisotropic electromagnetic cascade. The backward cascade ux is reprocessed by the underlying accretion disk. The small fraction of cascade-rays emitted in the forward direction is consistent with-ray ux limits for Seyfert galaxies and with the spectrum of the diiuse cosmic photon ux at high energies.