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Étude de la sensibilité de H.E.S.S. 2 en dessous de 300 GeV et recherche indirecte de matière noire dans les données de H.E.S.S.

Abstract : The H.E.S.S. telescope (High Energy Stereoscopic System) is an experiment of four imaging Cherenkov Telescope looking on gamma rays from 100GeV to 100TeV. In 2012, the experiment will be upgrades in a second phase with a fifth telescope of 28 m of diameter in the center of the existing system. At the threshold of 15 GeV, electromagnetic shower will be detected only by this big telescope so a new data analysis is needed. A new method based on a multidimensional analysis has been developed. Therefore, the energy of electromagnetic shower is well reconstructed with a good discrimination down to 30 GeV. At low energy, the sensitivity will be at few percent of the Crab in 50 hours. This new method has been tested on H.E.S.S. data and is very competitive with respect to the other energy reconstruction methods; an extension for stereoscopic events is also shown. The calibration processes and the results of tests of photomultipliers are described. A propagation model of cosmic rays has been developed to study diffuse gamma ray emission. Protons and helium nuclei have been propagated in the galaxy to estimate the emission of neutral pion decays after an interaction with the interstellar medium. The map production is described form the beginning to the end. I have estimated the sensitivity of H.E.S.S. to the prediction of the model. The Sagittarius dwarf galaxy is study as a dark matter dominated object. I used the most efficient analysis of the H.E.S.S collaboration and decomposed the data as a function of the zenith angle to decrease the energy threshold.
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https://tel.archives-ouvertes.fr/tel-00623972
Contributor : Julien Masbou Connect in order to contact the contributor
Submitted on : Thursday, September 15, 2011 - 3:11:23 PM
Last modification on : Friday, November 6, 2020 - 3:28:03 AM
Long-term archiving on: : Sunday, December 4, 2016 - 5:02:05 PM

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  • HAL Id : tel-00623972, version 1

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Julien Masbou. Étude de la sensibilité de H.E.S.S. 2 en dessous de 300 GeV et recherche indirecte de matière noire dans les données de H.E.S.S.. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université de Savoie, 2010. Français. ⟨tel-00623972⟩

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