Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-08-09
Astropart.Phys.12:207-216,2000
Astronomy and Astrophysics
Astrophysics
13 Pages, 7 figures, Latex. Astroparticle Physics, in press
Scientific paper
10.1016/S0927-6505(99)00109-7
We present analysis techniques to improve the energy resolution of stereoscopic systems of imaging atmospheric Cherenkov telescopes, using the HEGRA telescope system as an example. The techniques include (i) the determination of the height of the shower maximum, which is then taken into account in the energy determination, and (ii) the determination of the location of the shower core with the additional constraint that the direction of the gamma rays is known a priori. This constraint can be applied for gamma-ray point sources, and results in a significant improvement in the localization of the shower core, which translates into better energy resolution. Combining both techniques, the HEGRA telescopes reach an energy resolution between 9% and 12%, over the entire energy range from 1 TeV to almost 100 TeV. Options for further improvements of the energy resolution are discussed.
Hofmann Werner
Konopelko Alex
Krawczynski Henric
Lampeitl Hubert
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