The SLUGGS Survey: Wide Field Imaging of the Globular Cluster System of
  NGC 4278
  We use multi-pointing HST ACS and wide field Subaru Suprime-Cam imaging to
study the globular cluster system of the L* elliptical galaxy NGC 4278. We have
also obtained a handful of new globular cluster spectra with Keck/DEIMOS. We
determine the globular cluster surface density profile and use it to calculate
the total number of globular clusters, finding the system to be slightly more
populous than average for galaxies of its luminosity. We find clear evidence
for bimodality in the globular cluster colour distribution and for a
colour-magnitude relation in the blue subpopulation (a 'blue tilt'). We also
find negative radial colour gradients in both colour subpopulations of equal
strength which are similar in strength to those reported in other galaxies. The
sizes of NGC 4278's globular clusters decrease with redder colours and increase
with galactocentric radius. The ratio of the sizes of blue to red globular
clusters is independent of galactocentric radius demonstrating that internal
effects are responsible for the size difference with colour.
