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Fig. 8

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Weak-lensing analysis of the N-body numerical simulation (Dolag et al. 2006) performed with the isotropic, optimal matched filter described in Maturi et al. (2005). The filter was optimized to detect NFW dark-matter halos with masses of 5 × 1013  M/h (left panel) and 1 × 1015  M/h (right panel). The isocontours start from S   ! N = 2 in steps of ΔS   ! N = 1. The main halo and its ellipticity are clearly visible in the center of the field, as are the additional small substructures in the field.

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