IMF shape constraints from stellar populations and dynamics from CALIFA

descriptionPublicationkeyboard_double_arrow_right Article , Preprint 05 Oct 2016Embargo end date: 01 Jan 2016 Argentina, Italy, Austria, Netherlands, Chile English Publisher:Oxford University Press (OUP)Journal:Monthly Notices of the Royal Astronomical Society, volume 463, pages 3,220-3,225 (issn: 0035-8711, eissn: 1365-2966,

Copyright policy )Funded by:EC | SFEHG, EC | SEDMORPH, EC | DAGAL

Authors: Lyubenova, M.; Martín-Navarro, I.; van de Ven, G.; Falcón-Barroso, J.; Galbany, L.; GALLAZZI, Anna Rita; García-Benito, R.; +18 Authors

doi: 10.1093/mnras/stw2434 , 10.48550/arxiv.1606.07448

arXiv: 1606.07448

handle: 10261/147794 , 11370/1af50419-f733-4460-b0f8-d6b54741af01 , 11336/63592

IMF shape constraints from stellar populations and dynamics from CALIFA

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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, $Υ_\mathrm{dyn}$ and $Υ_{\ast}$, over a homogenous aperture of 0.5~$R_{e}$. We use the constraint $Υ_\mathrm{dyn} \ge Υ_{\ast}$ 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 1$σ$) 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.

6 pages, 3 figures, accepted for publication in MNRAS Letters

Countries

Argentina, Italy, Austria, Netherlands, Chile

Related Organizations

Leibniz Association
Germany
Autonomous University of Madrid
Spain
National Scientific and Technical Research Council
Argentina
Max Planck Society
Germany
Instituto de Astrofísica de Canarias
Spain

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Keywords

Cosmology and Nongalactic Astrophysics (astro-ph.CO), STELLAR CONTENT, 103003 Astronomie, INITIAL MASS FUNCTION, MODELS, SYSTEMATIC VARIATION, FOS: Physical sciences, SCALING RELATIONS, elliptical and lenticular, CD [Galaxies], cD, ELLIPTICAL AND LENTICULAR, CD, 103003 Astronomy, Galaxies: elliptical and lenticular, CD, https://purl.org/becyt/ford/1.3, DARK-MATTER, TO-LIGHT RATIO, EARLY-TYPE GALAXIES, 103004 Astrophysics, galaxies: elliptical and lenticular, https://purl.org/becyt/ford/1, galaxies: kinematics and dynamics, Galaxies: elliptical and lenticular, kinematics and dynamics [Galaxies], KINEMATICS AND DYNAMICS, Galaxies: kinematics and dynamics, 103004 Astrophysik, Galaxies: stellar content, SAURON PROJECT, Astrophysics - Astrophysics of Galaxies, CD, FUNDAMENTAL PLANE, Astrophysics of Galaxies (astro-ph.GA), MULTI-GAUSSIAN EXPANSION, galaxies: stellar content, stellar content [Galaxies], Astrophysics - Cosmology and Nongalactic Astrophysics

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