Galaxy-Galaxy Lensing with the CFHT Legacy Survey

Details Galaxy-Galaxy Lensing with the CFHT Legacy Survey Galaxy-Galaxy Lensing with the CFHT Legacy Survey

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..380..539p&link_type=abstract

At the Edge of the Universe: Latest Results from the Deepest Astronomical Surveys ASP Conference Series, Vol. 380, proceedings o

Astronomy and Astrophysics

Astronomy

Scientific paper

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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