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Galaxy clusters are considered as excellent probes for cosmology. For thatpurpose, their mass needs to be measured and their structural properties needsto be understood. We propose a method for galaxy cluster mass reconstructionwhich combines information from strong lensing, weak lensing shear and flexion.We extend the weak lensing analysis to the inner parts of the cluster and, inparticular, improve the resolution of substructure. We use simulations to showthat the method recovers the mass density profiles of the cluster. We find thatthe weak lensing flexion is sensitive to substructure. After combining theflexion data into the joint weak and strong lensing analysis, we can resolvethe cluster properties with substructures.

Mass reconstruction by gravitational shear and flexion