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Investigating systematics in the energy reconstruction of the H.E.S.S. telescopes

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Gast,  Robert
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Citation

Gast, R. (2009). Investigating systematics in the energy reconstruction of the H.E.S.S. telescopes. Diploma Thesis, Ruprecht-Karls Universität, Heidelberg.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-73E4-5
Abstract
H.E.S.S. is an array of four Imaging Atmospheric Cherenkov Telescopes that aims at exploring the non-thermal universe by means of photons with energies between 100 Ge V and 100 TeV. These very-high-energy (VHE) gamma-rays can be detected and their energy can be reconstructed by observing the Cherenkov light of extensive particle showers the VHE gamma-rays induce in the atmosphere. This work presents systematical studies of the H.E.S.S. energy reconstruction. The differences in the responses of the individual telescopes are tested and it is investigated whether such asymmetries have an effect on the overall accuracy of the energy reconstruction. Therefore the H.E.S.S. Standard Analysis is tested using Monte Carlo simulations and VHE gamma-ray data sets obtained from the observation of the Crab Nebula and the active galactic nucleus PKS 2155-304. Minor differences in the telescope responses at percentage level are found, which have increased slightly during the last five years, mirroring the decay of the optical components of the telescopes. However, the effect of these inter-telescope systematics on the energy reconstruction is negligible, especially when compared to the ≈ 17% overall energy resolution of the experiment.