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Analyse statistique de l'impact de la poussière et de l'émission radio des amas de galaxies

Joseph Lanoux 1
1 GAHEC - Galaxies, Astrophysique des Hautes Energies et Cosmologie
IRAP - Institut de recherche en astrophysique et planétologie
Abstract : Gravitation is the main engine of the formation and evolution of galaxy clusters. However, numerous non-gravitationnal processes are at work within the baryonic component of clusters and affect their global properties. The purpose of this thesis is the statistical analysis of two of those processes and of their impact on the formation and evolution of galaxy clusters. We focused on the effect of the presence of dust within the intracluster medium, together with the origin of the radio emission observed in the direction of clusters. Cooling by dust was first implemented in cosmological numerical simulations. We then quantified the impact of dust on both scaling and structural properties of clusters generated in those simulations. Our analysis showed that scaling relations and central matter distribution are significatively modified by dust. Dust can thus affect the evolution of intracluster medium properties. We also showed that cooling is tightly linked to dust physical properties, that are its abundance and its grain size distribution. As for galaxy clusters radio emission, it is due to point-like sources (active galactic nuclei, starburst galaxies) and to diffuse extended sources (halos, relics). Using the NVSS radio survey and the MCXC meta-catalogue, we statistically studied scaling relations between properties of radio active galaxies (fraction, radio luminosity, supermassive black hole mass of active nuclei) and halos properties that host them (total mass, X-ray luminosity). We showed that properties of those two populations are correlated. Finally, using the caracterisation of point-like radio sources and NVSS data, we looked for a statistical signature of diffuse extended radio emission in clusters. Nevertheless, this investigation was rapidly confronted to non-resolved point-like radio sources. Our study took us back as well to the question of the cluster fraction that hosts diffuse extended sources, and subsequently to their link with clusters dynamical state.
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Submitted on : Tuesday, July 24, 2012 - 5:16:17 PM
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  • HAL Id : tel-00720536, version 1



Joseph Lanoux. Analyse statistique de l'impact de la poussière et de l'émission radio des amas de galaxies. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université Paul Sabatier - Toulouse III, 2012. Français. ⟨tel-00720536⟩



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