Abstract
We report the detection of weak gravitational lensing of faint, distant background galaxies by the rich, X-ray luminous cluster of galaxies MS 1054-03 at z = 0.83. This is the first measurement of weak lensing by a bona fide cluster at such a high redshift. We detect tangential shear at the 5%-10% level over a range of radii 50'' r 250'' centered on the optical position of the cluster. Two-dimensional mass reconstruction using galaxies with 21.5 1).
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