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Astron. Astrophys. 327, L5-L8 (1997)

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2. The HEGRA IACT array

The HEGRA IACT system (Aharonian 1993) is located on the Canary Island of La Palma, at the Observatorio del Roque de los Muchachos of the Instituto Astrofisico de Canarias, at a height of about 2200 m asl. It consists of six IACTs, the first prototype CT1, the stereoscopic IACT system (CT3-CT6), and the prototype CT2, which will be included into the system after its refurbishment. The telescopes CT2,4,5,6 are arranged in the corners of a square with about 100 m side length, and the telescopes CT3 and CT1 are positioned in the center of the square. With the stereoscopic system, an air shower is viewed simultaneously from different directions, allowing to reconstruct the location of the shower axis in space, and in particular the direction of the primary and the core location. The four telescopes CT3-CT6 are essentially identical; they were installed during 1995 and 1996 and have been taking data as a 4-telescope system since Winter 1996/97. The telescopes have mirrors with 8.5 m2 area and 5 m focal length and are equipped with 271-pixel photomultiplier (PMT) cameras with [FORMULA] pixel size and a [FORMULA] field of view (Hermann 1995). For the trigger of the system a coincidence of at least two out of four telescopes is required.

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© European Southern Observatory (ESO) 1997

Online publication: April 6, 1998