Stereo Imaging of the VHE Gamma-Rays with HEGRA and H.E.S.S

Details Stereo Imaging of the VHE Gamma-Rays with HEGRA and H.E.S.S Stereo Imaging of the VHE Gamma-Rays with HEGRA and H.E.S.S

2000-11-10

arxiv.org/abs/astro-ph/0011214v1

AIPConf.Proc.558:569-573,2001

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, to appear in proc. of ``Heidelberg International Symposium on High Energy Gamma-Ray Astronomy'' edited by

Scientific paper

10.1063/1.1370825

At present, the ground-based astronomy of very high energy (VHE) (E>100 GeV) gamma-rays experiences the challenging transition phase caused by the substantial upgrading of its observational instrumentation. Recently the HEGRA collaboration has evidently demonstrated the power of arrays of imaging atmospheric Cherenkov telescopes and initiated a number of complementary projects, such as H.E.S.S., CANGAROO IV, VERITAS. The common philosophy of those projects is based on the stereoscopic observations of air showers with a number of imaging telescopes simultaneously. Such observations allow to reduce substantially the effective energy threshold of detected gamma-ray showers; to improve the angular and energy resolution for individual gamma-rays; to gain in suppression of the cosmic ray background. In my talk I have summarized the general advantages and achieved sensitivity of the stereoscopic observations using the HEGRA data taken with an array of 5 imaging telescopes having the energy threshold of 500 GeV. These results completed with the relevant simulations may be extrapolated on a firm ground towards the future H.E.S.S. (phase I) array of four 12 m imaging telescopes with the estimated energy threshold below 100 GeV. Here I discuss in short the anticipated performance of such an array.

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