AAS 201st Meeting, January, 2003
Session 32. Galaxy Evolution and Surveys: ``Far Away"
Oral, Monday, January 6, 2003, 2:00-3:30pm, 608-609

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[32.01] High-z early-type galaxies: mass and light from gravitational lensing and stellar kinematics

T. Treu (Caltech), L. Koopmans (STScI)

I will report on new results from the Lenses Structure and Dynamics Survey. We have measured spatially resolved velocity dispersion profiles of a sample of 11 distant (up to z=1) early-type galaxies that are gravitational lenses. By combining lensing and dynamical analysis we firmly constrain the dark matter density profile, the controversial inner slope of the dark matter halo, and the total mass distribution, and we give some constraints on the stellar orbits. In particular, I will discuss the implications of this measurement on the epoch and mechanism of formation of early-type galaxies, on the universal dark matter halos predicted by cold dark matter scenarios, and on the measurement of the Hubble Constant from gravitational time-delay observations.

Financial support for proposals HST-AR 9222 and HST-AR-09527 provided by NASA through a grant from STScI, which is operated by AURA under NASA contract NAS5-26555 is gratfully acknowledged.

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