Luminosity functions in the CLASH-VLT cluster MACS J1206.2-0847: the
  importance of tidal interactions
  We present the optical luminosity functions (LFs) of galaxies for the
CLASH-VLT cluster MACS J1206.2-0847 at z=0.439, based on HST and SUBARU data,
including ~600 spectroscopically confirmed member galaxies. The LFs on the wide
SUBARU FoV are well described by a single Schechter function down to M~M*+3,
whereas this fit is poor for HST data, due to a faint-end upturn visible down
M~M*+7, suggesting a bimodal behaviour. We also investigate the effect of local
environment by deriving the LFs in four different regions, according to the
distance from the centre, finding an increase in the faint-end slope going from
the core to the outer rings. Our results confirm and extend our previous
findings on the analysis of mass functions, which showed that the galaxies with
stellar mass below 10^10.5, M_sun have been significantly affected by tidal
interaction effects, thus contributing to the intra cluster light.
