Cross calibration of telescope optical throughput efficiencies using reconstructed shower energies for the Cherenkov Telescope Array |
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| Institution: | 1. ISDC, Astronomy Department, University of Geneva, Ch. d’Ecogia 16, Versoix 1290, Switzerland;2. AstroParticle and Cosmology (APC), 10 rue Alice Domon et Léonie Duquet, F-75205 Paris Cedex 13, France;1. Institut für Experimentelle Kernphysik (IEKP), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany;2. Institut für Kernphysik (IK), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany;1. Dpto. de Arquitectura y Tecnología de Computadores, Universidad de Granada, Granada, Spain;2. Dpto. de Física Teórica y del Cosmos & C.A.F.P.E., Universidad de Granada, Granada, Spain;3. Depto. de Ciências Básicas e Ambientais, Escola de Engenharia de Lorena, U. of São Paulo, São Paulo, Brazil |
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| Abstract: | For reliable event reconstruction of Imaging Atmospheric Cherenkov Telescopes (IACTs), calibration of the optical throughput efficiency is required. Within current facilities, this is achieved through the use of ring shaped images generated by muons. Here, a complementary approach is explored, achieving cross calibration of elements of IACT arrays through pairwise comparisons between telescopes, focussing on its applicability to the upcoming Cherenkov Telescope Array (CTA). Intercalibration of telescopes of a particular type using eventwise comparisons of shower image amplitudes has previously been demonstrated to recover the relative telescope optical responses. A method utilising the reconstructed energy as an alternative to image amplitude is presented, enabling cross calibration between telescopes of varying types within an IACT array. Monte Carlo studies for two plausible CTA layouts have shown that this calibration procedure recovers the relative telescope response efficiencies at the few per cent level. |
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