0 Assigned ID: 1112 ----- Attempting Submission 1 (Fri Apr 11 23:53:19 GMT 2014) ----- As the result of a variety of HST programs, there are now mosaics of ACS images of eight nearby elliptical and S0 galaxies available in the archive. We propose to use these wide area HST mosaics to systematically study the globular cluster systems of early-type galaxies out to large radii. These will allow us to significantly improve the determination of key characteristics of these globular cluster systems, including: the total number of globular clusters around these galaxies, the ratio of red to blue clusters in the total population, the color gradients in these systems, the ellipticity and any spatial asymmetry in the cluster population, and the dependence of the half-light radii on position in the galaxy. The determination of these properties is a key step in understanding how globular clusters and their host galaxies form and evolve. UNRESOLVED STELLAR POPULATIONS AND GALAXY STRUCTURE Default Medium false false false false false SUPPORTED