ABSTRACT

Although AGN come in a variety of forms, it is almost exclusively the blazar subclassifications of FSRQs and BL Lacs that have thus far proven to be detectable at energies above 10 MeV. The term ‘blazar’ is not rigorously defined but is usually taken to include Optically Violently Variable quasars (OVV), BL Lacs, sources that are radio-loud with compact cores, and sources that exhibit superluminal motion or strong polarization. Very often a source fits into more than one of these categories. Clearly, these are non-thermal sources with the observation of polarization, a flat radio spectrum (αr>− 0.6), x-ray emission, and a high degree of variability at all wavelengths.