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Theses

Propagation et distribution sur le ciel des rayons cosmiques d'ultra-haute
énergie dans le cadre de l'Observatoire Pierre Auger

Abstract : The origin of ultra-high energy cosmic rays remains an enigma of modern
physics, which the Pierre Auger Observatory, a detector with a hybrid
detection mode and an unprecedented size, will try to solve. The direct
observation of the sources of those particles, or of large-scale structures
in the sky associated to the sources, is one of the main goals of the
observatory. Such observations should also allow to constrain cosmic ray
propagation between their sources and the Earth, which is complicated by
interactions with low-energy photon backgrounds and deflections in
astrophysical magnetic fields.
This thesis is made of two parts, in order to observe and modelize the
sources of cosmic rays within the Auger Observatory.

We begin with an extensive description of the Pierre Auger Observatory, and
study the acceptance of its surface detector in order to build accurate sky
exposure maps, an essential tool in order to study anisotropies. Then we
present methods to search for anisotropies in the sky, and analyze the
first two years of Auger data.

After a description of the phenomena that can influence the propagation and
observation of ultra-high energy cosmic ray sources, we present numerical
simulations aiming at predicting observables such as the spectrum,
anisotropies and composition measurable by Auger as a function of various
astrophysical models. We show that extragalactic magnetic fields can play a
crucial role in particular if cosmic rays are partly heavy nuclei. Finally,
we show that the propagation of these particles from a nearby source
generates secondary fluxes of gamma-rays that could be detected by TeV
gamma-ray telescopes.
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Submitted on : Friday, June 2, 2006 - 4:47:22 PM
Last modification on : Wednesday, October 21, 2020 - 4:32:15 PM
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  • HAL Id : tel-00078124, version 1

Citation

Éric Armengaud. Propagation et distribution sur le ciel des rayons cosmiques d'ultra-haute
énergie dans le cadre de l'Observatoire Pierre Auger. Physique mathématique [math-ph]. Université Paris-Diderot - Paris VII, 2006. Français. ⟨tel-00078124⟩

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