2009/07/10 by J.-P. Lenain, J. -P. Lenain, Lenain, J. -P.
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #Neutrino Physics Research #astro-ph.CO #astro-ph.HE
paper · pdf · doi:10.48550/arxiv.0907.1832
5 pages, 4 figures. Invited talk given at the Frascati Workshop 2009 on the "Multifrequency behaviour of high-energy cosmic sources", Vulcano, May 2009 (to appear in Mem. S. A. It.)
arxiv created 2009/07/10 · openalex publication_date 2009/07/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In the recent years, the new generation of Imaging Atmospheric Cerenkov Telescopes successfully detected very high energy (VHE; E>100 GeV) gamma-ray emission from a growing number of Active Galactic Nuclei (AGNs), mainly belonging to the blazar class. Among these recent results, we will mainly focus in this work on two recent discoveries made with the H.E.S.S. experiment: the tremendously active state of the blazar PKS 2155-304 observed in July 2006 and the discovery of VHE gamma-rays from the radio galaxy Cen A. On the one hand, the observation of very fast variability in PKS 2155-304 challenges the current radiative standard models for TeV blazars. On the other hand, the discovery of Cen A as a source of VHE gamma-rays firmly establishes, together with the previous detection of M 87, radio galaxies as a new class of VHE emitters.