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L'annihilation des positrons galactiques : analyse et interprétation des données INTEGRAL

Abstract : Ever since the discovery of the 511 keV annihilation line emission from the Galactic center region in the late seventies, the origin of Galactic positrons has been the topic of a lively scientific debate. It is also one of the prime scientific objectives of the imaging spectrometer SPI on board ESA's INTEGRAL observatory.
In this thesis first a description of the most important SPI sub-system is given - the detector plane. Procedures for detector energy calibration and detector degradation analysis are developed. The determination of instrumental background models, a crucial aspect of data analysis, is elaborated. These background models are then applied to deriving sky maps and spectra of unprecedented quality of the Galactic positron annihilation radiation. Finally, the implications of these observations for the production of positrons by various Galactic populations are discussed.
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Contributor : Vincent Lonjou <>
Submitted on : Saturday, November 26, 2005 - 3:43:46 PM
Last modification on : Thursday, October 15, 2020 - 4:07:17 AM
Long-term archiving on: : Friday, April 2, 2010 - 11:12:56 PM


  • HAL Id : tel-00011121, version 1



Vincent Lonjou. L'annihilation des positrons galactiques : analyse et interprétation des données INTEGRAL. Astrophysique [astro-ph]. Université Paul Sabatier - Toulouse III, 2005. Français. ⟨tel-00011121⟩



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