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Our goal is to understand the nature of blazars and the mechanisms for thegeneration of high-energy $\gamma$-rays, through the investigation of theblazar 3C 66A. We model the high energy spectrum of 3C 66A, which has beenobserved recently with the Fermi-LAT and VERITAS telescope. The spectrum has ahard change from the energy range of 0.2-100 GeV to 200-500 GeV in recentalmost contemporaneous observations of two telescopes. The de-absorbed VERITASspectrum greatly depends on the redshift, which is highly uncertain. If z=0.444is adopted, we are able to use the SSC model to produce the Fermi-LAT componentand the EC model to the VERITAS component. However, if z=0.1, the intrinsicVERITAS spectrum will be softer, there will be a smooth link between theFermi-LAT and VERITAS spectra which can be explained using a SSC model.

Mechanism of very high energy radiation in BL Lacertae object 3C 66A