IMF shape constraints from stellar populations and dynamics from CALIFA

IMF shape constraints from stellar populations and dynamics from CALIFA 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 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Monthly Notices of the Royal Astronomical Society: Letters Oxford University Press

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Publisher
journal_eissn:11745-3933
Copyright
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
ISSN
1745-3925
eISSN
1745-3933
D.O.I.
10.1093/mnrasl/slw173
Publisher site
See Article on Publisher Site

Abstract

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

Journal

Monthly Notices of the Royal Astronomical Society: LettersOxford University Press

Published: Sep 5, 2016

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