We present a 3-dimensional lensing analysis of the z = 0.16 supercluster A901/2, resulting in a 3-D map of the dark matter distribution within a 3 × 10 5 [ h −1 Mpc] 3 volume. This map is generated from a combined catalogue of 3-D galaxy coordinates together with shear estimates, using R-band imaging and photometric redshifts from the COMBO-17 survey. To estimate the 3-D positions and masses of the main clusters in the supercluster from lensing alone, we perform a χ 2-fit of isothermal spheres to the tangential shear pattern around each cluster as a function of redshift. Motivated by the appearance of a second cluster behind A902 in galaxy number density, we also fit a two-cluster model to A902. We then present the first 3-D map of the dark matter gravitational potential field, Φ, using the Kaiser-Squires (1993) and Taylor (2001) inversion methods. These maps clearly show the potential wells of the main supercluster components, including the new cluster behind A902, and demonstrates the applicability of 3-D dark matter mapping and projection free-mass-selected cluster finding to current data. Finally, w
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