Cosmic shear: from galaxy shapes to cosmology
Intervenant : Nicolas Martinet
Weak lensing cosmic shear is one of the most powerful cosmological probes. In this presentation I will review the current state-of-the-art of such analyzes, from the accurate measurement of the galaxy image distortions up to the cosmological parameters' inference. I will illustrate my argument with two recent studies: an observational application of a new cosmic shear estimator to the on-going Kilo Degree Survey (KiDS) and a simulation of the impact of undetected galaxies on shear measurement for the Euclid satellite.