Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....7.2669g&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
2
Scientific paper
Giant radiogalaxies contain huge amounts of mass and exhibit large scale jets, probably powered by a supermassive black hole in the center of these objects. In contrast to Blazars, the jet of a radiogalaxy and the observer's line of sight are not aligned. A large amount of nonthermal particles which are supposed to emit TeV γ-radiation by several processes is expected to be confined within giant radiogalaxies. The three prominent objects M 87, NGC 1275 and Cygnus A have been observed in the years 1998 to 2000 using the stereoscopic system of Cherenkov telescopes operated on the Canary island of La Palma by the HEGRA Collaboration. Results of a search for TeV emission are presented. 1 Giant Radiogalaxies as possible TeV γ-Ray Emitters Extragalactic TeV γ-ray emission has been observed from several nearby Blazars ejecting matter in a jet oriented very close to the observer's line of sight. Other types of Active Galactic Nuclei (AGN) like giant radiogalaxies, however, also create relativistic mass outflows, though in contrast to Blazars under large viewing angles. Giant radiogalaxies contain huge amounts of mass. The object M 87, a well studied example in the Northern hemisphere, encloses a mass of approximately 1013 M in its inner 100 kpc (Dermer & Raphaeli, 1988). The central "engine" of these objects is supposed to be a supermassive black hole powering the development of the distinct large scale jets. In addition, a large amount of nonthermal particles is expected to be confined within giant radiogalaxies. The emission of TeV γ-radiation seems to be conceivable regarding these properties. Several production processes and different emission regions have been suggested, respectively: The acceleration of charged particles to very high energies in the jet production region gives rise to TeV γ-ray emission.
Goetting Niels
HEGRA Collaboration
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