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There is a long-standing discrepancy between galaxy cluster masses determinedfrom X-ray and gravitational lensing observations of which Abell 1689 is awell-studied example. In this work we take advantage of 180 ks of Chandra X-rayobservations and a new weak gravitational study based on a Hubble SpaceTelescope mosaic covering the central 1.8 Mpc x 1.4 Mpc to eliminate the massdiscrepancy. In contrast to earlier X-ray analyses where the very circularsurface brightness has been inferred as Abell 1689 being spherically symmetricand in hydrostatic equilibrium, a hardness ratio map analysis reveals a regularand symmetric appearing main clump with a cool core plus some substructure inthe North Eastern part of the cluster. The gravitational lensing mass modelsupports the interpretation of Abell 1689 being composed of a main clump, whichis possibly a virialized cluster, plus some substructure. In order to avoidcomplications and mis-interpretations due to X-ray emission from thesubstructure, we exclude it from the mass reconstruction. Comparing X-ray andlensing mass profiles of the regular main part only, shows no significantdiscrepancy between the two methods and the obtained mass profiles areconsistent over the full range where the mass can be reconstructed from X-rays(out to approx. 1 Mpc). The obtained cluster mass within approx. 875 kpcderived from X-rays alone is 6.4 plus/minus 2.1 x 10^14 solar masses comparedto a weak lensing mass of 8.6 plus/minus 3.0 x 10^14 solar masses within thesame radius.

Resolving the discrepancy between lensing and X-ray mass estimates of the complex galaxy cluster Abell 1689