Connection between dynamically derived imf normalisation and stellar population parameters
semanticscholar(2021)
摘要
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 ATLAS project. We study trends between our dynamically-derived IMF normalisation αdyn ≡ (M/L)stars/(M/L)Salp and absorption line strengths, and interpret these via single stellar population(SSP-) equivalent ages, abundance ratios (measured as [α/Fe]), and total metallicity, [Z/H]. We find that old and alphaenhanced 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 αdyn at a given population parameter. As a result, we find weak αdyn-[α/Fe] and αdyn−Age correlations and no significant αdyn−[Z/H] correlation. The observed trends appear significantly weaker than those reported in studies that measure the IMF normalisation via the low-mass star demographics inferred through stellar spectral analysis. Subject headings: galaxies: abundances galaxies: elliptical and lenticular, cD galaxies: kinematics and dynamics galaxies: stellar content
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