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We compare X-ray and weak-lensing masses for four galaxy clusters thatcomprise the top-ranked shear-selected cluster system in the Deep Lens Survey.The weak-lensing observations of this system, which is associated with A781,are from the Kitt Peak Mayall 4-m telescope, and the X-ray observations arefrom both Chandra and XMM-Newton. For a faithful comparison of masses, we adoptthe same matter density profile for each method, which we choose to be an NFWprofile. Since neither the X-ray nor weak-lensing data are deep enough to wellconstrain both the NFW scale radius and central density, we estimate the scaleradius using a fitting function for the concentration derived from cosmologicalhydrodynamic simulations and an X-ray estimate of the mass assumingisothermality. We keep this scale radius in common for both X-ray andweak-lensing profiles, and fit for the central density, which scales linearlywith mass. We find that for three of these clusters, there is agreement betweenX-ray and weak-lensing NFW central densities, and thus masses. For the othercluster, the X-ray central density is higher than that from weak-lensing by 2sigma. X-ray images suggest that this cluster may be undergoing a merger with asmaller cluster. This work serves as an additional step towards understandingthe possible biases in X-ray and weak-lensing cluster mass estimation methods.Such understanding is vital to efforts to constrain cosmology using X-ray orweak-lensing cluster surveys to trace the growth of structure over cosmic time.

Probing the Relation Between X-ray-Derived and Weak-Lensing-Derived Masses for Shear-Selected Galaxy Clusters: I. A781