Connection between dynamically derived IMF normalisation and stellar population parameters
McDermid, Richard M. · Cappellari, Michele · Alatalo, Katherine · Bayet, Estelle · Blitz, Leo · Bois, Maxime · Bournaud, Frederic · Bureau, Martin · Crocker, Alison F. · Davies, Roger L. · Davis, Timothy A. · de Zeeuw, P. T. · Duc, Pierre-Alain · Emsellem, Eric · Khochfar, Sadegh · Krajnovic, Davor · Kuntschner, Harald · Morganti, Raffaella · Naab, Thorsten · Oosterloo, Tom · Sarzi, Marc · Scott, Nicholas · Serra, Paolo · Weijmans, Anne-Marie · Young, Lisa M.
الأصل · EN
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.
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