A Monte Carlo template based analysis for air-Cherenkov arrays

被引：135

作者：

Parsons, R. D. ^{[1
]}

Hinton, J. A. ^{[2
]}

机构：

[1] Max Planck Inst Kernphys, D-69029 Heidelberg, Germany

[2] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England

来源：

ASTROPARTICLE PHYSICS | 2014年 / 56卷

基金：

英国科学技术设施理事会;

关键词：

Gamma-ray astronomy; IACT; Analysis technique; Cherenkov technique; GAMMA-RAY ASTRONOMY; TELESCOPES; HESS; SHOWERS; DESIGN; SYSTEM;

D O I：

10.1016/j.astropartphys.2014.03.002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：26 / 34

页数：9

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