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Etude de la distribution de matière noire par ses effets de lentille gravitationnelle dans les régimes des distorsions faibles et fortes.

Abstract : In the actual cosmological model, the Universe is made of 70% of dark energy and 30% of dark matter. The nature of both of them is still unknown. The thesis work focuses on this latter component. Using gravitational lensing, I address the issue of the dark matter distribution within cosmic structures. This technique is able to probe all the massive content of the Universe without regards of its nature or its dynamical state. It is a fundamental tool for small non-linear scale structures.

I compare the dark matter distribution deduced from weak lensing with the distribution of galaxies in the supercluster of galaxies MS0302+17 by analysing the mass-light correlation. The matter contrast can be related to the light contrast through a linear bias and a constant M/L ratio ~ 300. The light and mass maps are remarkably similar and show a cosmic-web-like structuration. I also present preliminary results of a weak lensing cluster survey that will be compared to the XMM-LSS data.

Moreover, a detailed strong and weak lensing analysis of the galaxy cluster MS2137-23 shows that the mass profile is consistent with a NFW model as deduced from numerical simulations. A study of the inner parts uses stellar dynamics of the central cD galaxy.
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https://tel.archives-ouvertes.fr/tel-00011228
Contributor : Raphael Gavazzi <>
Submitted on : Friday, December 16, 2005 - 9:28:50 PM
Last modification on : Tuesday, December 29, 2020 - 4:44:04 PM
Long-term archiving on: : Friday, September 14, 2012 - 4:30:13 PM

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  • HAL Id : tel-00011228, version 1

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Raphael Gavazzi. Etude de la distribution de matière noire par ses effets de lentille gravitationnelle dans les régimes des distorsions faibles et fortes.. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université Paris-Diderot - Paris VII, 2004. Français. ⟨tel-00011228⟩

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