%0 Journal Article
%T Connection between dynamically derived IMF normalisation and stellar population parameters
%A Richard M. McDermid
%A Michele Cappellari
%A Katherine Alatalo
%A Estelle Bayet
%A Leo Blitz
%A Maxime Bois
%A Frederic Bournaud
%A Martin Bureau
%A Alison F. Crocker
%A Roger L. Davies
%A Timothy A. Davis
%A P. T. de Zeeuw
%A Pierre-Alain Duc
%A Eric Emsellem
%A Sadegh Khochfar
%A Davor Krajnovic
%A Harald Kuntschner
%A Raffaella Morganti
%A Thorsten Naab
%A Tom Oosterloo
%A Marc Sarzi
%A Nicholas Scott
%A Paolo Serra
%A Anne-Marie Weijmans
%A Lisa M. Young
%J Physics
%D 2014
%I arXiv
%R 10.1088/2041-8205/792/2/L37
%X We report on empirical trends between the dynamically determined stellar initial mass function (IMF) and stellar population properties for a complete, volume-limited sample of 260 early-type galaxies from the Atlas3D project. We study trends between our dynamically-derived IMF normalisation and absorption line strengths, and interpret these via single stellar population- (SSP-) equivalent ages, abundance ratios (measured as [alpha/Fe]), and total metallicity, [Z/H]. We find that old and alpha-enhanced galaxies tend to have on average heavier (Salpeter-like) mass normalisation of the IMF, but stellar population does not appear to be a good predictor of the IMF, with a large range of normalisation at a given population parameter. As a result, we find weak IMF-[alpha/Fe] and IMF-age correlations, and no significant IMF-[Z/H] correlation. The observed trends appear significantly weaker than those reported in studies that measure the IMF normalisation via low-mass star demographics inferred through stellar spectral analysis.
%U http://arxiv.org/abs/1408.3189v1