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We analyze the correlations between central dark matter (DM) content ofearly-type galaxies and their sizes and ages, using a sample ofintermediate-redshift (z ~ 0.2) gravitational lenses from the SLACS survey, andby comparing them to a larger sample of z ~ 0 galaxies. We decompose thedeprojected galaxy masses into DM and stellar components using combinations ofstrong lensing, stellar dynamics, and stellar populations modeling. For a givenstellar mass, we find that for galaxies with larger sizes, the DM fractionincreases and the mean DM density decreases, consistently with the cuspy halosexpected in cosmological formation scenarios. The DM fraction also decreaseswith stellar age, which can be partially explained by the inverse correlationbetween size and age. The residual trend may point to systematic dependencieson formation epoch of halo contraction or stellar initial mass functions. Theseresults are in agreement with recent findings based on local galaxies byNapolitano, Romanowsky & Tortora (2010) and suggest negligible evidence ofgalaxy evolution over the last ~ 2.5 Gyr other than passive stellar aging.

Central dark matter trends in early-type galaxies from strong lensing, dynamics and stellar populations