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Mapping the 3-D dark matter with weak lensing

By A. N. Taylor, D. J. Bacon, M. E. Gray, C. Wolf, K. Meisenheimer, S. Dye, A. Borch, M. Kleinheinrich, Z. Kovacs and L. Wisotzki


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

Year: 2004
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