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A new analysis strategy for detection of faint gamma-ray sources with Imaging Atmospheric Cherenkov Telescopes
Paris Diderot University, France ; École Polytechnique, France.ORCID iD: 0000-0002-2115-2930
Paris Diderot University, France.
Paris Diderot University, France.
Paris Diderot University, France.ORCID iD: 0000-0002-4710-2165
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2011 (English)In: Astroparticle physics, ISSN 0927-6505, E-ISSN 1873-2852, Vol. 34, no 12, p. 858-870Article in journal (Refereed) Published
Abstract [en]

A new background rejection strategy for gamma-ray astrophysics with stereoscopic Imaging Atmospheric Cherenkov Telescopes (IACT), based on Monte Carlo (MC) simulations and real background data from the H.E.S.S. [High Energy Stereoscopic System, see [1].] experiment, is described. The analysis is based on a multivariate combination of both previously-known and newly-derived discriminant variables using the physical shower properties, as well as its multiple images, for a total of eight variables. Two of these new variables are defined thanks to a new energy evaluation procedure, which is also presented here. The method allows an enhanced sensitivity with the current generation of ground-based Cherenkov telescopes to be achieved, and at the same time its main features of rapidity and flexibility allow an easy generalization to any type of IACT. The robustness against Night Sky Background (NSB) variations of this approach is tested with MC simulated events. The overall consistency of the analysis chain has been checked by comparison of the real gamma-ray signal obtained from H.E.S.S. observations with MC simulations and through reconstruction of known source spectra. Finally, the performance has been evaluated by application to faint H.E.S.S. sources. The gain in sensitivity as compared to the best standard Hillas analysis ranges approximately from 1.2 to 1.8 depending on the source characteristics, which corresponds to an economy in observation time of a factor 1.4 to 3.2. (C) 2011 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
Elsevier, 2011. Vol. 34, no 12, p. 858-870
Keywords [en]
gamma/hadron discrimination, Weak gamma-ray sources, Imaging Atmospheric Cherenkov Telescopes, Multivariate analysis, Boosted decision trees
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-30241DOI: 10.1016/j.astropartphys.2011.03.005ISI: 000291958700002OAI: oai:DiVA.org:lnu-30241DiVA, id: diva2:663012
Available from: 2013-11-08 Created: 2013-11-08 Last updated: 2017-12-06Bibliographically approved

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Becherini, YvonnePunch, Michael

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