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We present a detailed analysis of the baryonic and dark matter distributionin the lensing cluster Abell 611 (z=0.288), with the goal of determining thedark matter profile over an unprecedented range of cluster-centric distance. Bycombining three complementary probes of the mass distribution, weak lensingfrom deep multi-color imaging, strong lensing constraints based on theidentification of multiply-imaged sources, and resolved stellar velocitydispersion measures for the brightest cluster galaxy (BCG), we extend themethodology for separating the dark and baryonic mass components introduced bySand et al. (2008). Our resulting dark matter profile samples the cluster from~3 kpc to 3.25 Mpc, thereby providing an excellent basis for comparisons withrecent numerical models. We demonstrate that only by combining our threeobservational techniques can degeneracies in constraining the form of the darkmatter profile be broken on scales crucial for detailed comparisons withnumerical simulations. Our analysis reveals that a simple Navarro, Frenk, andWhite (NFW) profile is an unacceptable fit to our data. We confirm earlierclaims that the inner profile of the dark matter profile deviates significantlyfrom the NFW form and find a inner logarithmic slope \beta flatter than 0.3(68%; where rho_DM ~ r^{-\beta} at small radii). In order to reconcile our datawith cluster formation in a LambdaCDM cosmology, we speculate that it may benecessary to revise our understanding of the nature of baryon--dark matterinteractions in cluster cores. Comprehensive weak and strong lensing data, whencoupled with kinematic information on the brightest cluster galaxy, can readilybe applied to a larger sample of clusters to test the universality of theseresults.

The Distribution of Dark Matter Over 3 Decades in Radius in the Lensing Cluster Abell 611