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There is an increasing number of observational evidence that very high energygamma-rays in radio-loud active galactic nuclei are produced in the directvicinity of a supermassive black hole (SMBH), close to the base of arelativistic jet. In the case of some blazars, the angle between the jet axisand the observer's line of sight is smaller than the angular extent of the jet.Gamma-rays that are produced close to SMBH therefore have to propagate in thenonthermal radiation of the extended jet before reaching the observer. Thisgamma-ray emission can be strongly absorbed in the extended jet radiation,producing a second generation of electron-positron pairs that loses energymainly via the synchrotron process. We show that this advanced inhomogeneousjet model can explain the multiwavelength spectrum of the BL Lac object Mrk 421in a nonflaring state for reasonable parameters of the jet and the SMBH.Moreover, we argue that synchrotron emission from the secondaryelectron-positron pairs, which appear as a result of absorption of gamma-raysthat are produced close to the SMBH within the jet radiation, is consistentwith the concave hard X-ray emission observed from Mrk 421.

Optically thick, nonlocal, inhomogeneous, stationary jet model for high-energy radiation from blazars: Application to Mrk 421