Environmental Effects on the UV Upturn in Local Clusters of Galaxies
  We explore the dependence of UV upturn colours in early type cluster galaxies
on the properties of their parent clusters (such as velocity dispersion and
X-ray luminosity) and on the positions and kinematics of galaxies within them.
We use a sample of 24 nearby clusters with highly complete spectroscopy and
optical/infrared data to select a suitable sample of red sequence galaxies,
whose FUV and NUV magnitudes we measure from archival GALEX data. Our results
show that the UV upturn colour has no dependence on cluster properties and has
the same range in all clusters. There is also no dependence on the projected
position within clusters or on line-of-sight velocity. Therefore, our
conclusion is that the UV upturn phenomenon is an intrinsic feature of cluster
early type galaxies, irrespective of their cluster environment.
