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We present the distribution of luminous and dark matter in a set of stronglensing (early-type) galaxies. By combining two independent techniques -stellar population synthesis and gravitational lensing - we can compare thebaryonic and dark matter content in these galaxies within the regions that canbe probed using the images of the lensed background source. Two samples werestudied, extracted from the CASTLES and SLACS surveys. The former probes awider range of redshifts and allows us to explore the mass distribution out to~5Re. The high resolution optical images of the latter (using HST/ACS) are usedto show a pixellated map of the ratio between total and baryonic matter. Wefind dark matter to be absent in the cores of these galaxies, with anincreasing contribution at projected radii R>Re. The slopes are roughlycompatible with an isothermal slope (better interpreted as an adiabaticallycontracted NFW profile), but a large scatter in the slope exists amonggalaxies. There is a trend suggesting most massive galaxies have a highercontent of dark matter in the regions probed by this analysis.

Mapping the distribution of luminous and dark matter in strong lensing galaxies