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Advanced analysis and event reconstruction for the CTA Observatory
University of Paris Diderot .ORCID iD: 0000-0002-2115-2930
Univ Paris Diderot, APC, AstroParticule & Cosmology, CNRS,IN2P3,CEA,Irfu, Observ Paris,Sorbonne Paris C, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, France.ORCID iD: 0000-0002-4710-2165
2012 (English)In: HIGH ENERGY GAMMA-RAY ASTRONOMY, American Institute of Physics (AIP), 2012, 769-772 p.Conference paper, Published paper (Refereed)
Abstract [en]

The planned Cherenkov Telescope Array (CTA) is a future observatory for very-high-energy (VHE) gamma-ray astronomy composed of one site per hemisphere [1]. It aims at 10 times better sensitivity, a better angular resolution and wider energy coverage than current installations such as H.E.S.S., MAGIC and VERITAS. In order to achieve this level of performance, both the design of the telescopes and the analysis algorithms are being studied and optimized within the CTA Monte-Carlo working group. Here, we present ongoing work on the data analysis for both the event reconstruction (energy, direction) and gamma/hadron separation, carried out within the HAP (H.E.S.S. Analysis Package) software framework of the H.E.S.S. collaboration, for this initial study. The event reconstruction uses both Hillas-parameter-based algorithms and an improved version of the 3D-Model algorithm [2]. For the gamma/hadron discrimination, original and robust discriminant variables are used and treated with Boosted Decision Trees (BDTs) in the TMVA [3] (Toolkit for Multivariate Data Analysis) framework. With this advanced analysis, known as Paris-MVA [4], the sensitivity is improved by a factor of similar to 2 in the core range of CTA relative to the standard analyses. Here we present the algorithms used for the reconstruction and discrimination, together with the resulting performance characteristics, with good confidence, since the method has been successfully applied for H.E.S.S.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2012. 769-772 p.
Series
AIP Conference Proceedings, ISSN 0094-243X ; 1505
Keyword [en]
Astronomical observations: gamma-ray, Observation and data reduction techniques, computer modeling and simulation, Mathematical procedures and computer techniques
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-30232DOI: 10.1063/1.4772373ISI: 000312503500160ISBN: 978-0-7354-1123-4 (print)OAI: oai:DiVA.org:lnu-30232DiVA: diva2:663018
Conference
5th International Meeting on High Energy Gamma-Ray Astronomy, JUL 09-13, 2012, Heidelberg, GERMANY
Available from: 2013-11-08 Created: 2013-11-08 Last updated: 2017-03-27Bibliographically approved

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Becherini, YvonnePunch, Michael

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