Skip to Main content Skip to Navigation
Theses

Etalonnage des cameras de l'experience d'astronomie gamma H.E.S.S. et observations du Centre Galactique au-dela de 100 GeV

Abstract : The H.E.S.S. experiment (High Energy Stereoscopic System) consists of four imaging atmospheric Cherenkov telescopes to study the southern astrophysical sources above 100 GeV. This thesis presents the detector as well as the analysis chain. The calibration methods are described in details and the systematic errors on the image amplitude are derived. Then, an analysis based on a semi-analytical model of the electromagnetic shower development in the atmosphere is presented. Tools to reconstruct the energy spectrum and the morphology of the very high energy gamma-ray sources are presented and applied to the Crab Nebula. Systematic errors associated to the spectrum analysis are estimated. All these techniques were applied to study the Galactic Centre emission above 100 GeV. The nature of the source detected in 2003 and 2004 obervations is still unknown and its spectrum, variability and morphology are studied. Various candidates are proposed, among them the supermassive black hole Sgr A* located at the dynamical centre of the Milky Way, the supernova remnant Sgr A Est or interactions of accelerated particles with the dense medium of this region. In this thesis, the signal was interpreted in terms of dark matter annihilation (neutralinos or Kaluza-Klein bosons) in a dense halo located at the Galactic Centre. This analysis showed that, in the framework of these models, dark matter annihilation alone can not explain the H.E.S.S. signal. The main componant would thus come from astrophysical sources.
Complete list of metadatas

Cited literature [30 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00010019
Contributor : Loïc Rolland <>
Submitted on : Thursday, September 1, 2005 - 1:09:16 PM
Last modification on : Friday, May 29, 2020 - 3:59:52 PM
Long-term archiving on: : Friday, September 14, 2012 - 2:10:34 PM

Identifiers

  • HAL Id : tel-00010019, version 1

Citation

Loic Rolland. Etalonnage des cameras de l'experience d'astronomie gamma H.E.S.S. et observations du Centre Galactique au-dela de 100 GeV. Astrophysique [astro-ph]. Université Pierre et Marie Curie - Paris VI, 2005. Français. ⟨tel-00010019⟩

Share

Metrics

Record views

546

Files downloads

739