The Fornax 3D project: a two-dimensional view of the stellar initial
  mass function in the massive lenticular galaxy FCC 167
  The stellar initial mass function (IMF) regulates the baryonic cycle within
galaxies, and is a key ingredient to translate observations into physical
quantities. Although for decades it was assumed to be universal, there is now
growing observational evidence showing that the center of massive early-type
galaxies host an enhanced population of low-mass stars compared to the
expectations from the Milky Way. Moreover, these variations in the IMF have
been found to be related to the radial metallicity variations in massive
galaxies. We present here a two-dimensional stellar population analysis of the
massive lenticular galaxy FCC 167 (NGC 1380) as part of the Fornax3D project.
Using a newly developed stellar population fitting scheme, we derive a full
two-dimensional IMF map of an early-type galaxy. This two-dimensional analysis
allows us go further than a radial analysis, showing how the metallicity
changes along a disc-like structure while the IMF follows a distinct, less
disky distribution. Thus, our findings indicate that metallicity cannot be the
sole driver of the observed radial IMF variations. In addition, a comparison
with the orbital decomposition shows suggestive evidence of a coupling between
stellar population properties and the internal dynamical structure of FCC 167,
where metallicity and IMF maps seem to track the distribution of cold and warm
orbits, respectively.
