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Modélisation de l'émission d'annihilation des positrons Galactiques

Abstract : Positrons annihilate in the central region of our Galaxy. This has been known since the detection of a strong emission line centered on an energy of 511 keV in the direction of the Galactic center. This gamma-ray line is emitted during the annihilation of positrons with electrons from the interstellar medium. The spectrometer SPI, onboard the INTEGRAL observatory, performed spatial ans spectral analyses of the positron annihilation emission.
This thesis presents a study of the Galactic positron annihilation emission based on models of the different interactions undergone by positrons in the interstellar medium. The models are relied on our present knowledge of the properties of the interstellar medium in the Galactic bulge, where most of the positrons annihilate, and of the physics of positrons (production, propagation and annihilation processes). To obtain constraints on the positrons sources and physical characteristics of the annihilation medium, we compared the results of the models to measurements provided by the SPI spectrometer.
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Contributor : Williams Exbrayat <>
Submitted on : Tuesday, April 29, 2008 - 11:44:09 AM
Last modification on : Thursday, October 15, 2020 - 4:07:07 AM
Long-term archiving on: : Friday, May 28, 2010 - 5:58:45 PM


  • HAL Id : tel-00276275, version 1



William Gillard. Modélisation de l'émission d'annihilation des positrons Galactiques. Astrophysique [astro-ph]. Université Paul Sabatier - Toulouse III, 2008. Français. ⟨tel-00276275⟩



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