IMF shape constraints from stellar populations and dynamics from CALIFA

DOI: 
10.1093/mnras/stw2434
Publication date: 
01/12/2016
Main author: 
Lyubenova, M.
IAA authors: 
García-Benito, R.;González Delgado, R.
Authors: 
Lyubenova, M.;Martín-Navarro, I.;van de Ven, G.;Falcón-Barroso, J.;Galbany, L.;Gallazzi, A.;García-Benito, R.;González Delgado, R.;Husemann, B.;La Barbera, F.;Marino, R. A.;Mast, D.;Mendez-Abreu, J.;Peletier, R. F. P.;Sánchez-Blázquez, P.;Sánchez, S. F.;Trager, S. C.;van den Bosch, R. C. E.;Vazdekis, A.;Walcher, C. J.;Zhu, L.;Zibetti, S.;Ziegler, B.;Bland-Hawthorn, J.;CALIFA Collaboration
Journal: 
Monthly Notices of the Royal Astronomical Society
Refereed: 
Yes
Publication type: 
Article
Volume: 
463
Pages: 
3220-3225
Abstract: 
In 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, Υ<SUB>dyn</SUB> and Υ<SUB>*</SUB>, over a homogenous aperture of 0.5 R<SUB>e</SUB>. We use the constraint Υ<SUB>dyn</SUB>≥Υ<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 1σ) 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.
Database: 
ADS
SCOPUS
URL: 
https://ui.adsabs.harvard.edu/#abs/2016MNRAS.463.3220L/abstract
ADS Bibcode: 
2016MNRAS.463.3220L
Keywords: 
galaxies: elliptical and lenticular;cD;galaxies: kinematics and dynamics;galaxies: stellar content;Astrophysics - Astrophysics of Galaxies;Astrophysics - Cosmology and Nongalactic Astrophysics