F. Tavecchio
Published 2010-01-22Version 1
Blazars, radio-loud active galactic nuclei with the relativistic jet closely aligned with the line of sight, dominate the extragalactic sky observed at gamma-ray energies, above 100 MeV. We discuss some of the emission properties of these sources, focusing in particular on the "blazar sequence" and the interpretative models of the high-energy emission of BL Lac objects.
Comments: 8 pages, 4 figures, to appear in the proceedings of the HEPRO II conference, Buenos Aires, October 26-30 2009
Absorption features in sub-TeV gamma-ray spectra of BL Lac objects
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