Models of Tev Blazars

The time-dependent one-zone model for blazar emission is reviewed. An application is made for the TeV gamma-ray spectra of two AGNs Mkn 501 and Mkn 421 that have almost the same redshifts: z=0.031 and z=0.034 respectively. The effect of intergalactic gamma-ray absorption is treated as an uncertainty in the measurement of the intrinsic spectrum. Although the objects differ we obtain satisfactory fits for both of them in a synchrotron self-Compton scenario. Compared to previous models our fits are characterised by higher values of the Doppler factor (>= 50) and an electron injection spectrum extending to higher energies (Gmax = 1.5x105). In the case of Mkn 421 the observed difference in spectral slope in X-rays and TeV gamma-rays between the high and low states can be explained as a variation of a single parameter - the maximum energy Gmax mc2 at which electrons are injected. These results are discussed with respect to recent particle acceleration theories in blazar jets