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Session 73 - Gravitational Lensing.
Display session, Wednesday, January 15
When cluster galaxies are projected near strongly lensed arcs the resulting additional distortions in the arcs are a strong function of the mass distributions in these individual cluster galaxies. We obtain precise measurements of galaxy mass, cutoff radii, and mass profiles from a parametrized fit to the multiply imaged gravitational lens system CL0024. CL0024 has six identifiable images of the background galaxy, and eight images of parts of it. We parameterize the source galaxy, and map it through the lens model for a direct pixel-by-pixel comparison with the images. The positions and detailed structure of the arcs provides strong constraints for parameters of nearby galaxies. The galaxies are well approximated by truncated isothermal spheres, in some cases with soft cores. We present measurements of truncation radii and mass to light ratios for selected galaxies in the cluster.
Program listing for Wednesday