Far-ultraviolet color gradients in early-type galaxies

We discuss far-UV (FUV) (1500 Angstrom) surface photometry and FUV-B color profiles for eight E/S0 galaxies from images taken with the Ultraviolet Ima ging Telescope, primarily during the Astro-2 mission. In three cases, the F UV radial profiles are more consistent with an exponential than a de Vaucou leurs function, but there is no other evidence for the presence of a disk o r of young, massive stars. In all cases except M32, the FUV-B color becomes redder at larger radii. There is a wide range of internal radial FUV-B col or gradients. However, we find no correlation between the FUV-B color gradi ents and internal metallicity gradients based-on Mg absorption features. We conclude that metallicity is not the sole parameter controlling the "UV up turn component" in old populations.