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Contraintes apportées par la spectroscopie intégrale de champ à la formation et à l'évolution des galaxies.

Abstract : This thesis focuses on the formation and evolution of galaxies. The new multi-integral field spectrograph FLAMES/GIRAFFE, offered to the community by ESO, is unique in studying the dynamics of galaxies at z<1, which can then provide a link between distant and local populations of galaxies. We discuss here the data analysis of intermediate galaxies, obtained using this instrument under the Guaranteed Time Observations for the Paris Observatory (GEPI). The results show that the fraction of galaxies which have not reached their dynamical equilibrium at z~0.6 is important. This fraction is even more important among Luminous Compact Galaxies (LCGs), which supports the hypothesis that these galaxies could be merging systems. The use of slit spectroscopy does not allow to efficiently disentangle relaxed from unrelaxed systems. This explains the disagrement found in the studies on the evolution of the Tully-Fisher relation. The results presented in this thesis show a non-evolution of this relation in the velocity versus stellar mass diagram. Finally, analysing data from GIRAFFE with its IFU mode shows that mapping the physical and chemical properties of the interstellar medium in distant galaxies is useful to understand the mechanisms responsible for the star formation in distant galaxies. To extend the integral field spectroscopy to galaxies at higher redshfits, one needs to explore the coupling of this technique with adaptive optics. The FALCON project (dedicated to both VLTs and ELTs) is a new promising way in this direction introducing Multi-Object Adaptive Optics (MOAO). In this concept, only the regions of scientific interests are corrected and analyzed instead of the whole field of view. We discuss the development of miniaturized systems to analyse and correct the wavefront as well as an original control and command strategy in open loop.
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Contributor : Mathieu Puech <>
Submitted on : Friday, March 24, 2006 - 4:25:46 PM
Last modification on : Wednesday, September 23, 2020 - 4:38:56 AM
Long-term archiving on: : Monday, September 17, 2012 - 1:00:10 PM


  • HAL Id : tel-00012037, version 1



Mathieu Puech. Contraintes apportées par la spectroscopie intégrale de champ à la formation et à l'évolution des galaxies.. Astrophysique [astro-ph]. Université Paris-Diderot - Paris VII, 2006. Français. ⟨tel-00012037⟩



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