AAS 201st Meeting, January, 2003
Session 80. Gravitational Lenses
Poster, Wednesday, January 8, 2003, 9:20am-6:30pm, Exhibit Hall AB

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[80.01U] The Angular Structure of Four-Image Gravitational Lenses

C. M. Turner (University of Oregon), C. R. Keeton (University of Chicago), C. S. Kochanek (Harvard-Smithsonian Center for Astrophysics)

Using four-image gravitational lenses in the CfA-Arizona Space Telescope Lens Survey, we probe the angular structure of lens galaxy mass distributions. The models show the lens potential is successfully constrained for four-image lenses. The largest contribution to shear perturbations is found outside of the lens' Einstein ring, which suggests a dramatic, outlying mass component. We find strong evidence that most lens galaxies have extended, flattened dark matter halos.

CMT acknowledges support from the NSF/REU program at the University of Chicago's Department of Physics. CRK acknowledges support from a Hubble Fellowship grant, awarded through STScI.

The author(s) of this abstract have provided an email address for comments about the abstract: cturner@deepcore.uoregon.edu

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