DETAILED MASS MAP OF CL-0024+1654 FROM STRONG LENSING

We construct a high-resolution mass map of the z = 0.39 cluster 0024 1654, based on a parametric inversion of the associated gravitational lens. The lens creates eight well-resolved subimages of a background galaxy, seen in deep imaging with the Hubble Space Telescope.(1) Exclu ding mass concentrations centered on visible galaxies, more than 98% o f the remaining mass is represented by a smooth concentration of dark matter centered near the brightest cluster galaxies, with a 35 h(-1) k pc soft core. The asymmetry in the mass distribution is less than 3% i nside 107 h(-1) kpc radius. The dark matter distribution we observe in CL 0024 is far more smooth, symmetric, and nonsingular than in typica l simulated clusters in either Omega = 1 or Omega = 0.3 cold dark matt er cosmologies. Integrated to a 107 h(-1) kpc radius, the rest-frame m ass-to-light ratio is M/L-v = 276 +/- 40 h (M/L-v)..