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Dark Matter in the Central Regions of Early Type Galaxies

Published online by Cambridge University Press:  19 May 2006

M. Cappellari
Affiliation:
Leiden Observatory, Postbus 9513, 2300 RA Leiden, The Netherlands
R. Bacon
Affiliation:
Centre de Recherche Astrophysique de Lyon, Saint Genis Laval, France
M. Bureau
Affiliation:
Denys Wilkinson Building, University of Oxford, Keble Road, Oxford, UK
M.C. Damen
Affiliation:
Leiden Observatory, Postbus 9513, 2300 RA Leiden, The Netherlands
R.L. Davies
Affiliation:
Denys Wilkinson Building, University of Oxford, Keble Road, Oxford, UK
P.T. de Zeeuw
Affiliation:
Leiden Observatory, Postbus 9513, 2300 RA Leiden, The Netherlands
E. Emsellem
Affiliation:
Centre de Recherche Astrophysique de Lyon, Saint Genis Laval, France
J. Falcón-Barroso
Affiliation:
Leiden Observatory, Postbus 9513, 2300 RA Leiden, The Netherlands
D. Krajnović
Affiliation:
Denys Wilkinson Building, University of Oxford, Keble Road, Oxford, UK
H. Kuntschner
Affiliation:
Space Telescope European Coordinating Facility, European Southern Observatory, Germany
R.M. McDermid
Affiliation:
Leiden Observatory, Postbus 9513, 2300 RA Leiden, The Netherlands
R.F. Peletier
Affiliation:
Kapteyn Astronomical Institute, Postbus 800, 9700 AV Groningen, The Netherlands
M. Sarzi
Affiliation:
Denys Wilkinson Building, University of Oxford, Keble Road, Oxford, UK
R.C.E. van den Bosch
Affiliation:
Leiden Observatory, Postbus 9513, 2300 RA Leiden, The Netherlands
G. van de Ven
Affiliation:
Leiden Observatory, Postbus 9513, 2300 RA Leiden, The Netherlands
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Abstract

We investigate the well-known correlations between the dynamical mass-to-light ratio M/L and other global observables of elliptical (E) and lenticular (S0) galaxies. We construct two-integral Jeans and three-integral Schwarzschild dynamical models for a sample of 25 E/S0 galaxies with SAURON integral-field stellar kinematics to about one effective (half-light) radius Re. The comparison of the dynamical M/L with the (M/L)pop inferred from the analysis of the stellar population, indicates that dark matter in early-type galaxies contributes ~30% of the total mass inside one Re, in agreement with previous studies, with significant variations from galaxy to galaxy. Our results suggest a variation in M/L at constant (M/L)pop, which seems to be linked to the galaxy dynamics. We speculate that fast rotating galaxies have lower dark matter fractions than the slow rotating and generally more massive ones.

Type
Research Article
Copyright
© EAS, EDP Sciences, 2006

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