Linking assembly history and stellar populations: chemical abundance and IMF gradients in massive elliptical galaxies
Padraig Alton
Durham University CEA
R.J. Smith (Durham University), J.R. Lucey (Durham University)
Spectra from the cores of massive early type galaxies appear to indicate that their stellar populations are enriched with dwarf stars (i.e. they formed their stars according to a bottom-heavy IMF), as well as having super-solar metal abundances.

The outskirts of these massive galaxies are less well observed, but are thought to be assembled by accretion of less massive systems. These are not so chemically enriched and presumably formed stars according to a standard IMF, so spatial variations in stellar populations can in principle provide constraints on galaxy formation.

We investigate the stellar populations of nearby elliptical galaxies by means of spatially resolved infrared spectroscopy from VLT-KMOS. I will discuss the extent to which our observations support a spatially varying IMF in massive ellipticals and the implications of our work for galaxy formation theory.