Abstract In this letter we describe how we use stellar dynamics information to constrain the shape of the stellar IMF in a sample of 27 early-type galaxies from the CALIFA survey. We obtain dynamical and stellar mass-to-light ratios, ϒ dyn and ϒ ★ , over a homogenous aperture of 0.5 Re . We use the constraint ϒ dyn ≥ϒ ★ to test two IMF shapes within the framework of the extended MILES stellar population models. We rule out a single power law IMF shape for 75% of the galaxies in our sample. Conversely, we find that a double power law IMF shape with a varying high-mass end slope is compatible (within 1σ) with 95% of the galaxies. We also show that dynamical and stellar IMF mismatch factors give consistent results for the systematic variation of the IMF in these galaxies. galaxies: elliptical and lenticular, cD, galaxies: stellar content, galaxies: kinematics and dynamics © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society: Letters – Oxford University Press
Published: Sep 5, 2016
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