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Observations, avec les télescopes H.E.S.S., du rayonnement gamma émis par le Noyau Actif de Galaxie PKS 2155-304, au-delà de 100 GeV

Abstract : CELESTE is an atmospheric Cherenkov telescope based on the reconversion of the Themis solar facility, located in the Eastern Pyrénées. The mirrors, named heliostats, samples the Cherenkov light emitted by the electromagnetic shower created by gamma-rays in the atmosphere.
The CELESTE experiment was designed during the 90's to cover the 30-300 GeV energy range and to fill the gap between satellites and imaging atmospheric Cherenkov telescopes. In 2000, we attained our goal with the detection of the Crab Nebula and those of the active galactic nucleus Markarian 421.
This thesis presents the work accomplished since then to improve the sensitivity of our instrument by studying the detector and by developing a new analysis. Despite the very bad weather conditions, a new detection of the Crab Nebula is presented here which validates the principle of
the new analysis. This manuscript ends with the study of the data sample taken on two Active Galactic Nuclei, the blazars Markarian 421 and 1ES1426+428.
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Submitted on : Thursday, November 30, 2006 - 12:01:13 PM
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Nicolas Leroy. Observations, avec les télescopes H.E.S.S., du rayonnement gamma émis par le Noyau Actif de Galaxie PKS 2155-304, au-delà de 100 GeV. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Ecole Polytechnique X, 2004. Français. ⟨tel-00117166⟩

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