The Next Generation of Ground-based Gamma Ray Telescopes

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

A next generation of ground-based atmospheric Cherenkov telescopes is currently under construction covering an energy range of 30 GeV - 50 TeV. The detection of very high energy photons with the present generation of telescopes has demonstrated the power of the imaging atmospheric Cherenkov technique, showing a large collection area ( ~ 10^5 \: m^2), excellent angular resolution ( ~ 0.1^circ), good energy resolution (10 - 15%) and low background. However, existing detectors are limited to energies above 200 GeV allowing for a large gap in energy between satellite and ground-based telescopes. Also, the sensitivity of the technique can be substantially improved by using arrays of telescopes. The scientific objectives for studying various astrophysical high energy γ-ray sources can be summarized by their general underlying themes: the understanding of particle acceleration and propagation in the Universe, the origin of cosmic rays and the search for dark matter. Addressing the science most effectively requires a complete coverage in energy between sub-GeV to multi-TeV photons. The next generation ground-based γ-ray telescopes will complement GLAST, the next generation γ-ray telescope in space. I will describe the design and capabilities of the next generation ground-based γ-ray telescopes with emphasis on imaging telescopes (MAGIC) and arrays of imaging telescopes such as HESS, VERITAS and CANGAROO-III.

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