Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-12-18
Astropart.Phys. 11 (1999) 363-377
Astronomy and Astrophysics
Astrophysics
25 Pages, 16 figures, Latex
Scientific paper
10.1016/S0927-6505(99)00003-1
The time profiles of Cherenkov images of cosmic-ray showers and of gamma-ray showers are investigated, using data gathered with the HEGRA system of imaging atmospheric Cherenkov telescopes during the 1997 outbursts of Mrk 501. Photon arrival times are shown to vary across the shower images. The dominant feature is a time gradient along the major axis of the images. The gradient varies with the distance between the telescope and the shower core, and is maximal for large distances. The time profiles of cosmic-ray showers and of gamma-ray showers differ in a characteristic fashion. The main features of the time profiles can be understood in terms of simple geometrical models. Use of the timing information towards improved shower reconstruction and cosmic-ray suppression is discussed.
et al Hess M.
HEGRA Collaboration
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