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The internal structure of high-Z E/S0 galaxies from LSD

Published online by Cambridge University Press:  22 December 2003

C. Boily ,
P. Patsis ,
S. Portegies ,
R. Spurzem ,
C. Theis ,
T. Treu  and
L. V.E. Koopmans
T. Treu
Affiliation:
California Institute of Technology, Astronomy 105-24, Pasadena, CA 91125, USA
L. V.E. Koopmans
Affiliation:
Space Telescope Science Institute, 3700 San Martin Dr, Baltimore, MD 21218, USA
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Abstract

We summarize results from the first year of the Lenses Structure andDynamics Survey (LSD). Using the Echelle Imager and Spectrograph atthe Keck-II Telescope, we have measured spatially resolved velocitydispersion profiles of a sample of distant (up to z=1) early-typegalaxies that are gravitational lenses. By combining lensing anddynamical analyses we can set firm limits on the dark matter densityprofile, the controversial inner slope of the dark matter halo, themass-to-light ratio of the luminous component, the total massdistribution, and on the velocity ellipsoid by breaking the massanisotropy-relation. The implications of these measurements in termson the epoch and mechanism of formation of E/S0 galaxies and of thevalue of the Hubble constant are briefly discussed.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 10: JENAM 2002, Galactic & Stellar Dynamics , 2003 , pp. 61
Copyright
© EAS, EDP Sciences, 2003

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