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We study the relative alignment of mass and light in a sample of 16 massiveearly-type galaxies at z=0.2-0.9 that act as strong gravitational lenses. Thesample was identified from deep multi-band images obtained as part of theCanada France Hawaii Telescope Legacy Survey as part of the Strong LensingLegacy Survey (SL2S). Higher resolution follow-up imaging is available for asubset of 10 systems. We construct gravitational lens models and infer totalenclosed mass, elongation, and position angle of the mass distribution. Bycomparison with the observed distribution of light we infer that there is asubstantial amount of external shear with mean value $<\gamma_{\rm ext}>= 0.12\pm 0.05$, arising most likely from the environment of the SL2S lenses. In acompanion paper, we combine these measurements with follow-up Keck spectroscopyto study the evolution of the stellar and dark matter content of early-typegalaxies as a function of cosmic time.

The SL2S Galaxy-scale Gravitational Lens Sample. I. The alignment of mass and light in massive early-type galaxies at z=0.2-0.9