Dark matter in the central regions of early type galaxies

M. Cappellari*, R. Bacon, M. Bureau, M. C. Damen, R. L. Davies, P. T. De Zeeuw, E. Emsellem, J. Falcon-Barroso, D. Krajnović, H. Kuntschner, R. M. McDermid, R. F. Peletier, M. Sarzi, R. C E Van Den Bosch, G. Van De Ven

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

Abstract

We investigate the well-known correlations between the dynamical rnass-to-light ratio M/L and other global observables of elliptical (E) arid 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.

Original languageEnglish
Title of host publication21st IAP Colloquium Mass Profiles and Shapes of Cosmological Structures
EditorsG Mamon, F Combes, C Deffayet, B Fort
Place of PublicationLes Ulis, France
PublisherEDP Sciences
Pages127-130
Number of pages4
Volume20
ISBN (Print)2868839177, 9782868839176
DOIs
Publication statusPublished - 2006
Externally publishedYes
Event21st IAP Colloquium Mass Profiles and Shapes of Cosmological Structures - Paris, France
Duration: 4 Jul 20059 Jul 2005

Publication series

NameEAS Publications Series
Volume20
ISSN (Print)16334760

Other

Other21st IAP Colloquium Mass Profiles and Shapes of Cosmological Structures
CountryFrance
CityParis
Period4/07/059/07/05

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