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Paper: Observations of BL Lac Objects with the HEGRA Cherenkov Telescopes
Volume: 159, BL Lac Phenomenon
Page: 235
Authors: Petry, Dirk
Abstract: Among the now 4(+7) certain sources of gamma radiation above 500 GeV, 2(+1) are BL Lac objects (the numbers in brackets are sources which need independent confirmation), and these are at the same time the only known extragalactic sources of TeV Gamma rays. All detections have so far been made using the ``atmospheric Cherenov technique'', i.e. by so-called imaging atmospheric Cherenkov telescopes (IACTs). One of the large experiments using IACTs is the HEGRA installation which is operating six IACTs as part of its cosmic ray detector complex at the ORM (Observatorio Roque de los Muchachos) on the Canary island La Palma. The talk will give a summary of the results obtained so far.
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