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We present observations of weak gravitational lensing from several X-ray luminous clusters of galaxies having redshifts exceeding 12. Along with describing the remarkable case of the cluster MS1054-03 at z = 0.83, we also present new results for the two clusters MS 0016+16 at z = 0.55 and MS 0451-03 at z = 0.54, and show preliminary data for the newly-discovered rich cluster RJX1716+67 at z = 0.818.
Canadian Institute for Advanced Research and Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St. George St.Toronto, M5S 1A7Canada