Gamma-ray Emitting AGN and Unified Schemes

Paolo Padovani

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arXiv · astro-ph/9704002

Gamma-ray Emitting AGN and Unified Schemes

Paolo Padovani

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Abstract

Active Galactic Nuclei (AGN) are now known to be strong gamma-ray emitters. After briefly describing the different classes of AGN and the basic tenets of unified schemes, I discuss the role of blazars (that is BL Lacs and flat-spectrum radio quasars) as gamma-ray sources. The main properties of blazars and their connection with relativistic beaming are then summarized. Finally, I address the question of why blazars, despite being extreme and very rare objects, are the only AGN detected at very high (E > 100 MeV) energies, and touch upon the relevance of TeV astronomy for AGN research.

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Paolo Padovani. 1997-04-01. Gamma-ray Emitting AGN and Unified Schemes. https://arxiv.org/abs/astro-ph/9704002

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