Eric JULLO
(JPL/Caltech)
The 2deg HST/COSMOS weak lensing project led by JPL-Caltech can be considered as a preparation to future space missions like JDEM/Euclid. Weak lensing techniques used so far are intrinsically limited to the analysis of large scale structures. In this talk, I present a new method that combines strong and weak lensing to extend the analysis of the matter power spectrum to small scale structures. The method also allows to introduce prior knowledge in a Bayesian way, such as stellar mass and X ray hot gas distribution, in order to separate the baryonic and non-baryonic components of the power spectrum.