Weak lensing mass determinations

Weak lensing has proved to be an excellent technique for the analysis of mass distribution of astronomical systems, since it is sensitive to baryonic and non-baryonic matter. Nevertheless, detecting weak lensing signal is a great challenge given that the distortions that need to be measured are strongly affected by the atmosphere and the telescope effects. In this work we present the results of the analysis of several galaxy systems. We determined lensing masses and analysed the dark matter distribution of galaxy clusters. Within this analysis we include merging galaxy clusters, from which information regarding the nature of dark matter could be inferred. We also present the results of a stacking lensing analysis to galaxy groups, including compact groups. We obtained the masses and studied the mass dependence with the physical parameters of these systems.