A two-component model for the high-energy variability of blazars. Application to PKS 2155-304

摘要

We study the production of VHE emission in blazars as a superposition of asteady component from a baryonic jet and a time- dependent contribution from aninner e-e+ beam launched by the black hole. Both primary relativistic electronsand protons are injected in the jet, and the particle distributions along itare found by solving a one-dimensional transport equation that accounts forconvection and cooling. The short-timescale variability of the emission isexplained by local pair injections in turbulent regions of the inner beam. Forillustration, we apply the model to the case of PKS 2155-304, reproducing aquiescent state of emission with inverse Compton and synchrotron radiation fromprimary electrons, as well as proton-proton interactions in the jet. The latteralso yield an accompanying neutrino flux that could be observed with a newgeneration km-scale detector in the northern hemisphere such as KM3NeT.