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Etude du fond diffus galactique des électrons et positrons et étude des performances de la seconde phase de l'expérience H.E.S.S.

Abstract : The telescope array H.E.S.S. (High Energy Stereoscopic System) allows to detect cosmic ray particles with the Cherenkov light that is emitted by the secondary particles resulting of the interaction of the primary particles in the Earth’s atmosphere. Besides the detection and the study of astrophysical sources that emit rays, H.E.S.S. allows to study the different diffuse emissions that compose the cosmic rays. The interest of these diffuse emissions for the comprehension of the origin and the propagation of cosmic rays as well as the chance that they conduct to the detection of a dark matter signal is recalled in this manuscript. Following a presentation of the H.E.S.S. experiment, the possible improvment of the discrimination between rays and electrons with H.E.S.S. is discussed. Especially, the possibility of detecting direct Cherenkov light emitted by primary cosmic ray electrons but not by primary rays is addressed. Then, a discriminating method based on a log-likelihood comparison between recorded images and template images from a semi-analytical model is used to obtain a spectral reconstruction of the cosmic ray electrons and positrons with H.E.S.S. data. This measurement allows for the first time to establish the shape of the energy spectrum of cosmic ray electrons and positrons up to20 TeV.
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  • HAL Id : tel-01722819, version 1

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Daniel Kerszberg. Etude du fond diffus galactique des électrons et positrons et étude des performances de la seconde phase de l'expérience H.E.S.S.. Physique de l'espace [physics.space-ph]. Université Pierre et Marie Curie - Paris VI, 2017. Français. ⟨NNT : 2017PA066320⟩. ⟨tel-01722819⟩

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