Friday 14 September at 2pm

ABSTRACT: "We are conducting a lensing survey of 10 massive galaxy clusters at z~0.2 using the Hubble Space Telescope. These observations allow us to construct detailed models of the mass distribution in these systems at an epoch when growth of clusters is expected to be strong. We also use multi-wavelength ground based observations to study the background galaxy populations and thus probe galaxy evolution to depths generally inaccessible to conventional surveys. This talk will summarise the background to our survey and present our results to date, including constraints on the cluster dark matter profile from radial arcs, and a search for gravitationally lensed EROs."

NEAR-INFRARED SPECTROSCOPY AND HUBBLE SPACE TELESCOPE IMAGING OF A DUSTY STARBURST ERO, Smith et al., 2001, ApJ, in press (astro-ph/0108039)

A HUBBLE SPACE TELESCOPE LENSING SURVEY OF X-RAY LUMINOUS GALAXY CLUSTERS: II. A SEARCH FOR GRAVITATIONALLY LENSED EROs, Smith et al., 2001, MNRAS submitted

A HUBBLE SPACE TELESCOPE LENSING SURVEY OF X-RAY LUMINOUS GALAXY CLUSTERS: I. A383, Smith et al., 2001, ApJ, 552, 493