Weak and strong lensing analysis of the triaxial matter distribution of A1689

Understand

Halos formed in the standard Lambda cold dark matter framework should follow an universal mass density profile and fit a well defined mass-concentration relation.

• Lensing analyses of clusters with a large Einstein radius seem to contradict this scenario, with the massive cluster Abell 1689 being often claimed as a notable example of a highly over-concentrated halo.
• Shape and orientation biases in lensing studies might be at the basis of this disagreement between theory and observations.
• We developed a method for a full three-dimensional analysis of strong and weak lensing data.