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Simulation of the annihilation emission of galactic positrons; Modelisation de l'emission 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 and 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). In order 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. (author)
Authors:
Publication Date:
Jan 15, 2008
Product Type:
Thesis/Dissertation
Report Number:
FRNC-TH-7503
Resource Relation:
Other Information: TH: These astrophysique des hautes energies; 260 refs.; Also available from Universite Paul Sabatier, S.C.D. Toulouse-3 B.U. de Sciences, 118 route de Narbonne, 31062 - Toulouse Cedex (France)
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CHARGED-PARTICLE TRANSPORT; COSMIC POSITRONS; ELECTRON-POSITRON INTERACTIONS; EMISSION SPECTRA; INTERSTELLAR SPACE; POSITRON SOURCES
OSTI ID:
21182825
Research Organizations:
Toulouse-3 Univ. Paul Sabatier, 31 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR0802014057085
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
248 pages
Announcement Date:
Jul 20, 2009

Citation Formats

Gillard, W. Simulation of the annihilation emission of galactic positrons; Modelisation de l'emission d'annihilation des positrons Galactiques. France: N. p., 2008. Web.
Gillard, W. Simulation of the annihilation emission of galactic positrons; Modelisation de l'emission d'annihilation des positrons Galactiques. France.
Gillard, W. 2008. "Simulation of the annihilation emission of galactic positrons; Modelisation de l'emission d'annihilation des positrons Galactiques." France.
@misc{etde_21182825,
title = {Simulation of the annihilation emission of galactic positrons; Modelisation de l'emission d'annihilation des positrons Galactiques}
author = {Gillard, W}
abstractNote = {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 and 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). In order 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. (author)}
place = {France}
year = {2008}
month = {Jan}
}