Simulation of Cherenkov Contamination for Cosmic-Ray Showers Observed with the Auger Fluorescence Telescopes

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Scientific paper

Any measurement of cosmic ray shower features relying on the fluorescence light technique requires a good knowledge of Cherenkov light contribution along shower development. The results of a simulation study concerning properties of Cherenkov light emission are shown using GEANT and CORSIKA. An evaluation of the Cherenkov contribution to the photon profile detected by fluorescence telescopes has been carried out by performing shower simulations with CORSIKA. For a given primary energy and geometry, an analytical function is then built, providing the number of Cherenkov photons at any depth and for any angle to shower axis. This method has been applied to a few hybrid events collected during the engineering prototype phase of the Auger Fluoresence Detector (12/2001-3/2002).

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