Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sf2a.conf..225g&link_type=abstract
"SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel, F. Combes
Astronomy and Astrophysics
Astrophysics
Scientific paper
AGNs are a class of objects emitting over a very broad energy range. Most AGNs observed at VHE are Blazars, so named because they have jets which are orientated towards us. In this case, the observed γ-rays, produced by the particle acceleration and emission processes in the jets, benefit from boosting by the Lorentz factor, so that their energies can reach the TeV. The first TeV Blazar, Mkn421, was discovered in 1992 with the Whipple observatory. Today, the known γ-ray sky contains over 20 of these objects, with the detections being carried out mainly by MAGIC and VERITAS for the Northern hemisphere and by H.E.S.S. for the Southern hemisphere. The present generation of Čerenkov telescopes has improved the quality of the spectral characterization and is now sensitive enough to detect variability on time-scales of minutes for the brightest sources. The detected TeV AGN study is essential for the comprehension of the processes taking place in the jets which are at the origin of the γ emission. The spectra of the farthest sources also highly constrain the density of the extragalactic background light.
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