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Session 124 - Elliptical Galaxies.
Oral session, Saturday, January 10
Monroe,
Analyzing the relationship between X-ray temperature and velocity dispersion in an optically complete sample of elliptical galaxies recently derived by Davis amp; White, we demonstrate that L>L_* galaxies contain substantial amounts of dark matter in general. We also present constraints on the dark matter scale length and on the dark-to-luminous mass ratio both within the optical half-light radius and for the entire galaxy. Our results can be consistently embedded within a standard CDM scenario for structure formation, but only if elliptical galaxies have suffered substantial mass loss with less massive systems losing progressively more mass.
