Recherche de neutrinos cosmiques de haute-énergie émis par des sources ponctuelles avec ANTARES

Garabed Halladjian 1
1 ANTARES
CPPM - Centre de Physique des Particules de Marseille
Abstract : The aim of this thesis is the search for high energy cosmic neutrinos emitted by point sources with the ANTARES neutrino telescope. The detection of high energy cosmic neutrinos can bring answers to important questions such as the origin of cosmic rays and the $\gamma$-rays emission processes. In the first part of the thesis, the neutrino flux emitted by galactic and extragalactic sources and the number of events which can be detected by ANTARES are estimated. This study uses the measured $\gamma$-ray spectra of known sources taking into account the $\gamma$-ray absorption by the extragalactic background light. In the second part of the thesis, the absolute pointing of the ANTARES telescope is evaluated. Being located at a depth of 2475 m in sea water, the orientation of the detector is determined by an acoustic positioning system which relies on low and high frequency acoustic waves measurements between the sea surface and the bottom. The third part of the thesis is a search for neutrino point sources in the ANTARES data. The search algorithm is based on a likelihood ratio maximization method. It is used in two search strategies; ''the candidate sources list strategy'' and ''the all sky search strategy''. Analysing 2007+2008 data, no discovery is made and the world's best upper limits on neutrino fluxes from various sources in the Southern sky are established.
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Garabed Halladjian. Recherche de neutrinos cosmiques de haute-énergie émis par des sources ponctuelles avec ANTARES. Phénomènes cosmiques de haute energie [astro-ph.HE]. Université de la Méditerranée - Aix-Marseille II, 2010. Français. ⟨tel-00798866⟩

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