Connection between dynamically derived IMF normalisation and stellar
  populations
  In this contributed talk I present recent results on the connection between
stellar population properties and the normalisation of the stellar initial mass
function (IMF) measured using stellar dynamics, based on a large sample of 260
early-type galaxies observed as part of the Atlas3D project. This measure of
the IMF normalisation is found to vary non-uniformly with age- and
metallicity-sensitive absorption line strengths. Applying single stellar
population models, there are weak but measurable trends of the IMF with age and
abundance ratio. Accounting for the dependence of stellar population parameters
on velocity dispersion effectively removes these trends, but subsequently
introduces a trend with metallicity, such that `heavy' IMFs favour lower
metallicities. The correlations are weaker than those found from previous
studies directly detecting low-mass stars, suggesting some degree of tension
between the different approaches of measuring the IMF. Resolving these
discrepancies will be the focus of future work.
