12-20 July 2017
BEXCO
Asia/Seoul timezone
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Contribution

BEXCO - Room F(201/202/203/204)

[GA281] Toward a 3D analysis in Cerenkov gamma-ray astronomy

Speakers

  • Daniel KERSZBERG

Primary authors

  • Lea JOUVIN (APC, AstroParticule et Cosmologie, Université Paris Diderot, CNRS/IN2P3, CEA/Irfu, Observatoire de Paris, Sorbonne Paris Cité)

Co-authors

  • Axel DONATH (Max-Planck-Institut für Kernphysik)
  • Christoph DEIL (Max-Planck-Institut für Kernphysik)
  • Anne LEMIÈRE (APC, AstroParticule et Cosmologie, Université Paris Diderot, CNRS/IN2P3, CEA/Irfu, Observatoire de Paris, Sorbonne Paris Cité)
  • Bruno KHELIFI (APC, AstroParticule et Cosmologie, Université Paris Diderot, CNRS/IN2P3, CEA/Irfu, Observatoire de Paris, Sorbonne Paris Cité)
  • Regis TERRIER (APC, AstroParticule et Cosmologie, Université Paris Diderot, CNRS/IN2P3, CEA/Irfu, Observatoire de Paris, Sorbonne Paris Cité)
  • Daniel KERSZBERG (LPNHE, Université Pierre et Marie Curie Paris 6, Université Denis Diderot Paris 7, CNRS/IN2P3)

Description

The development of a 3D or cube analysis to simultaneously fit a spectral and morphological model on a data cube than contains the events for an observation in three dimensions (energy, longitude and latitude) in Cerenkov gamma-ray astronomy is a challenge. The strong variation of the instrument response function to the residual cosmic rays background with the observation conditions makes it very difficult to build a coherent background model whatever the energy band. Nevertheless, with the sensitivity and resolution of the current Cerenkov telescopes and their next generation such as the Cherenkov Telescope Array, the complex morphology of the regions with diffuse emission or multiple sources requires the development of this technique. We developed this cube analysis as well as a background model depending on the observation conditions in the software Gammapy, an open-source Python package for gamma-ray astronomy that provides tools to simulate and analyse the gamma-ray sky for imaging atmospheric Cerenkov telescopes. To validate the method, we performed a systematic comparison between this cube analysis and the classical 1D spectral fitting on point sources using a Monte Carlo simulation from the H.E.S.S. collaboration.