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Paper: Galaxy-Galaxy Lensing with the CFHT Legacy Survey
Volume: 380, At the Edge of the Universe: Latest Results from the Deepest Astronomical Surveys
Page: 529
Authors: Parker, L.
Abstract: We present the first galaxy-galaxy weak lensing results from the Canada-France-Hawaii Telescope (CFHT) Legacy Survey. These results are based on ~22 sq.degrees of i′-band imaging data. From these data we estimate the average halo velocity dispersion, mass and mass-to-light ratio of an L* galaxy at a redshift of 0.3. We also use lensing to estimate the shapes of galaxy halos. Our results favour a dark matter halo with an ellipticity of ~0.4. If dark matter halos are confirmed to be non-spherical this places constraints on alternative theories of gravity and supporting evidence for cold dark matter models.
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