Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004rac..conf..327d&link_type=abstract
RELATIVISTIC ASTROPHYSICS AND COSMOLOGY. Proceedings of the 13th Course of the International School of Cosmic Ray Astrophysics.
Astronomy and Astrophysics
Astrophysics
Scientific paper
Blazar active galactic nuclei are thought to be a subset of radio galaxies where the jets are pointed towards us. A brief review of the properties of blazars is presented, and the central features of leptonic and hadronic models are summarized. Differences between BL Lac objects and flat spectrum radio quasars (FSRQs) are considered with regard to dominant radiation processes and an evolutionary scenario for blazar evolution. Features of a proton blazar model are described, including a calculation of hadronic cascade radiation from photomeson processes. The AGN broad line region (BLR) provides an intense external radiation field in FSRQs that is important for producing detectable fluxes of neutrinos. Neutral beams formed through hadronic processes in the inner jets of blazars could power the extended jets and account for morphological differences between BL Lac objects and FSRQs.
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