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The recent associations of neutrinos with blazars require the efficientinteraction of relativistic protons with ambient soft photon fields. However,along side the neutrinos gamma-ray photons are produced which interact with thesame soft photon fields producing electron-positron pairs. The strength of thiscascade has significant consequences on the photon spectrum in various energybands and puts severe constraints on the pion and neutrino production. In thisstudy, we discuss the influence of the external thermal photon fields(accretion disk, broad-line region, and dusty torus) on the proton-photoninteractions employing a newly developed time-dependent one-zone hadro-leptoniccode (OneHaLe). We present steady-state cases, as well as a time-dependentcase, where the emission region moves through the jet. Within the limits ofthis toy study, the external fields can disrupt the ``usual'' double-humpedblazar spectrum. Similarly, a moving region would cross significant portions ofthe jet without reaching the previously-found steady states.

Studying the influence of external photon fields on blazar spectra using a one-zone hadro-leptonic time-dependent model