Lemoine-goumard, Marianne (2006) Stereoscopy of gamma-ray showers with the H.E.S.S. telescopes: First images of supernova remnants in the TeV range. PhD thesis LLR, EP - LLR, EP/X p.297.
Full text not available from this repository. |
|
Alternative Locations: http://www.imprimerie.polytechnique.fr/Theses/Files/ Lemoine_Goumard.pdf
Abstract
The HESS (High Energy Stereoscopic
System) experiment in gamma-ray Astronomy consists of four imaging atmospheric Cherenkov telescopes devoted to the observation of the gamma-ray sky in the energy domain above 100 GeV and extending up to several tens of TeV. This thesis presents a new reconstruction method of gamma-ray induced air showers which takes full advantage of the stereoscopy and of the fine-grain imaging of the HESS cameras.
This new method provides an angular resolution better than 0 - 1
degree, an energy resolution of about 15% at zenith and a very efficient hadronic rejection based on a cut on the lateral spread of the electromagnetic shower. A new background subtraction method, well adapted to the study of extended sources, was also developed. No assumptions, either on the distribution of gamma-rays in the field of view, or on the distribution of hadrons are necessary. It provides two skymaps obtained from a maximum likelih!
ood fit: one for gamma-rays and the other for hadrons. These two analysis methods were applied to the study of the shell-type supernova remnants RX J1713.7-3946 and Vela Junior, allowing for the first time to resolve their morphology in the gamma-ray domain. A morphological and spectral study of these sources combined with a comparison of a simple model of emission processes provides some constraints on the parameters of the leptonic process. The different results obtained are discussed and compared with the supernova remnant SN 1006.
| Item Type: | PhD Thesis (PhD) |
|---|---|
| Thesis Supervisor: | Bernard, Degrange |
| Date: | May 2006 |
| Board of examiners: | Decourchelle, Anne and Katsanevas, Stavros and Parizot, Etienne and Rosier-lees, Sylvie and Smith, David |
| Ecole Doctorale: | ED 447 ECOLE DOCTORALE DE L'ECOLE POLYTECHNIQUE |
| Discipline: | LLR |
| Collection (Fonds): | EP/X |
| Institution: | EP/X |
| Department: | EP - LLR |
| Subjects: | 3. Physics, Optics |
| Uncontrolled Keywords: | Very high energy gamma-ray astronomy, imaging atmospheric Cherenkov, H.e.s.s., 3D Model, Supernova remnants, Rx j1713.7-3946, Rx j0852.0-4622, Vela Junior, Sn 1006, Astronomie gamma de très hautes énergies, imagerie Tcherenkov atmosphérique, H.e.s.s., Modèle 3D, Vestiges de supernovae, Rx j1713.7-3946, Rx j0852.0-4622, Vela Junior, Sn 1006 |
Table of content
Introduction
I. L'Astronomie gamma des hautes énergies
II. L'expérience H.E.S.S., un instrument de troisième génération
III. Analyse des données Tcherenkov
IV. Observations de vestiges de supernovae à coquilles
Conclusion
| ID Code: | 1892 |
|---|---|
| Deposited By: | Laurence Vidament |
| Deposited On: | 15 September 2006 |
Repository Staff Only: edit this item