Stellar Populations of Spectroscopically Decomposed Bulge-Disk for S0
  Galaxies from the CALIFA survey
  We investigate the stellar population properties of bulges and disks
separately for 34 S0s using integral field spectroscopy from the Calar Alto
Legacy Integral Field Area survey. The spatially resolved stellar age and
metallicity of bulge and disk components have been simultaneously estimated
using the penalized pixel fitting method with photometrically defined weights
for the two components. We find a tight correlation between age and metallicity
for bulges, while the relation for disks has a larger scatter than that of
bulges. This implies that the star formation histories of the disks are more
complicated than those of the bulges. Bulges of the high-mass S0s are mostly
comparable in metallicity, while bulges appear to be systematically more
metal-rich than disks for the low-mass S0s. The ages of bulges and disks in the
high-mass S0s appear to increase with local density. The bulge ages of the
low-mass S0s also increases with local density, but such a trend is not clear
in the disk ages of low-mass S0s. In addition, the age difference between bulge
and disk components (delta Age) tends to increase with local density, both for
the high-mass and low-mass S0s. The high-mass S0s have systematically higher
delta Age than the low-mass S0s at given local density. Our results indicate
that the stellar mass significantly influences the evolution of S0 galaxies,
but the environment also plays an important role in determining the evolution
of bulges and disks at given stellar mass.
