CAT & CELESTE: Gamma Astronomy at Thémis

Physics – Nuclear Physics

Scientific paper

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Scientific paper

Two independent sampling arrays, THEMISTOCLE and ASGAT, were installed in 1988 on the site of a former power solar, ``Thémis'', in the french Pyrenees. Shortly after the discovery of the TeV gamma-ray emission from the Crab Nebula by the imaging telescope of the Whipple Observatory, the ``Thémis'' arrays confirmed these observations and extended them to higher energies. They are now interconnected with a new imaging telescope whose expected energy threshold is about 200 GeV. This last device is under commissioning at the time of this Symposium. The complete setup is named ``CAT'' for ``Cherenkov Array at Thémis''. Furthermore, the overall Thémis solar plant will soon be reactivated as a γ-ray detector, most of its heliostats back to operation, a large secondary mirror taking the place of the solar furnace. This approved CELESTE project will represent a further step towards low energies, hopefully closing the gap between space and ground-based observations.

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