[68.01] The Lenses Structure and Dynamics Survey: luminous and dark matter in high redshift early-type galaxies

AAS 203rd Meeting, January 2004
Session 68 Galaxy Clusters and Large Scale Structure III
Oral, Tuesday, January 6, 2004, 2:00-3:30pm, Centennial III

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[68.01] The Lenses Structure and Dynamics Survey: luminous and dark matter in high redshift early-type galaxies

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

I will present the latest results from the Lenses Structure and Dynamics (LSD) Survey. Using ESI on the Keck Telescope, we have measured spatially resolved stellar kinematics for a sample of 11 early-type galaxies (E/S0s) in the range z=0.1-1, selected as gravitational lenses. By combining lensing and dynamical analysis, we break the degeneracies inherent to each method alone and obtain an accurate measurement of the amount and distribution of dark matter in high redshift E/S0s. I will discuss the implications of these measurements on the epoch and mechanism of formation of early-type galaxies. I will also show how this method can be used to measure the Hubble Constant from gravitational time delays with precision similar to the local distance ladder method.

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