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We extend our analyses of the dark matter (DM) distribution in relaxedclusters to the case of Abell 383, a luminous X-ray cluster at z=0.189 with adominant central galaxy and numerous strongly-lensed features. Following ourearlier papers, we combine strong and weak lensing constraints secured withHubble Space Telescope and Subaru imaging with the radial profile of thestellar velocity dispersion of the central galaxy, essential for separating thebaryonic mass distribution in the cluster core. Hydrostatic mass estimates fromChandra X-ray observations further constrain the solution. These combineddatasets provide nearly continuous constraints extending from 2 kpc to 1.5 Mpcin radius, allowing stringent tests of results from recent numericalsimulations. Two key improvements in our data and its analysis make this themost robust case yet for a shallow slope \beta of the DM density profile\rho_DM ~ r^-\beta on small scales. First, following deep Keck spectroscopy, wehave secured the stellar velocity dispersion profile to a radius of 26 kpc forthe first time in a lensing cluster. Secondly, we improve our previous analysisby adopting a triaxial DM distribution and axisymmetric dynamical models. Wedemonstate that in this remarkably well-constrained system, the logarithmicslope of the DM density at small radii is \beta < 1.0 (95% confidence). Animproved treatment of baryonic physics is necessary, but possibly insufficient,to reconcile our observations with the recent results of high-resolutionsimulations.

The Dark Matter Distribution in Abell 383: Evidence for a Shallow Density Cusp from Improved Lensing, Stellar Kinematic and X-ray Data