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IMF shape constraints from stellar populations and dynamics from CALIFA

AuthorsLyubenova, M.; García-Benito, Rubén ; González Delgado, Rosa M. ; CALIFA Collaboration
KeywordsGalaxies: elliptical and lenticular, CD
Galaxies: stellar content
Galaxies: kinematics and dynamics
Issue Date2016
PublisherOxford University Press
CitationMonthly Notices of the Royal Astronomical Society 463(3): 3220- 3225 (2016)
AbstractIn this paper, we describe how we use stellar dynamics information to constrain the shape of the stellar initial mass function (IMF) in a sample of 27 early-type galaxies from the CALIFA survey. We obtain dynamical and stellar mass-to-light ratios, ¿<SUB>dyn</SUB> and ¿<SUB>*</SUB>, over a homogenous aperture of 0.5 R<SUB>e</SUB>. We use the constraint ¿<SUB>dyn</SUB>¿¿<SUB>*</SUB> 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 per cent 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 1¿) with 95 per cent 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. © 2016, Published by Oxford University Press on behalf of the Royal Astronomical Society.
DescriptionM. Lyubenova et. al.
Publisher version (URL)http://dx.doi.org/10.1093/mnras/stw2434
Identifiersdoi: 10.1093/mnras/stw2434
issn: 0035-8711
Appears in Collections:(IAA) Artículos
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