Dark Matter in the Central Regions of Early Type Galaxies

Details Dark Matter in the Central Regions of Early Type Galaxies Dark Matter in the Central Regions of Early Type Galaxies

2005-11-17

arxiv.org/abs/astro-ph/0511530v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, LaTeX. Proceedings of the XXIst IAP Colloquium "Mass Profiles and Shapes of Cosmological Structures", Edit

Scientific paper

10.1051/eas:2006058

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 R_e. 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 R_e, 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.

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