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  A Monte Carlo Template based analysis for Air-Cherenkov Arrays

Parsons, R. D., & Hinton, J. A. (2014). A Monte Carlo Template based analysis for Air-Cherenkov Arrays. Astroparticle Physics, 56, 26-34. doi:10.1016/j.astropartphys.2014.03.002.

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1403.2993.pdf (Preprint), 358KB
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Parsons, R. D.1, Autor           
Hinton, J. A.2, Autor
Affiliations:
1Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society, ou_904550              
2Department of Physics and Astronomy, The University of Leicester, University Road, Leicester LE1 7RH, United Kingdom, ou_persistent22              

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Schlagwörter: Astrophysics, Instrumentation and Methods for Astrophysics, astro-ph.IM, Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
 MPINP: HESS - Abteilung Hofmann
 Zusammenfassung: We present a high-performance event reconstruction algorithm: an Image Pixel-wise fit for Atmospheric Cherenkov Telescopes (ImPACT). The reconstruction algorithm is based around the likelihood fitting of camera pixel amplitudes to an expected image template. A maximum likelihood fit is performed to find the best-fit shower parameters. A related reconstruction algorithm has already been shown to provide significant improvements over traditional reconstruction for both the CAT and H.E.S.S. experiments. We demonstrate a significant improvement to the template generation step of the procedure, by the use of a full Monte Carlo air shower simulation in combination with a ray-tracing optics simulation to more accurately model the expected camera images. This reconstruction step is combined with an MVA-based background rejection. Examples are shown of the performance of the ImPACT analysis on both simulated and measured (from a strong VHE source) gamma-ray data from the H.E.S.S. array, demonstrating an improvement in sensitivity of more than a factor two in observation time over traditional image moments-fitting methods, with comparable performance to previous likelihood fitting analyses. ImPACT is a particularly promising approach for future large arrays such as the Cherenkov Telescope Array (CTA) due to its improved high-energy performance and suitability for arrays of mixed telescope types.

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 Datum: 2014-03-12
 Publikationsstatus: Online veröffentlicht
 Seiten: 13 pages, 10 figures
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Titel: Astroparticle Physics
  Andere : Astropart. Phys.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Amsterdam, Netherlands : North-Holland
Seiten: - Band / Heft: 56 Artikelnummer: - Start- / Endseite: 26 - 34 Identifikator: ISSN: 0927-6505
CoNE: https://pure.mpg.de/cone/journals/resource/954925567770