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We measure the average mass properties of a sample of 41 strong gravitationallenses at moderate redshift (z ~ 0.4 - 0.9), and present the lens redshift for6 of these galaxies for the first time. Using the techniques of strong and weakgravitational lensing on archival data obtained from the Hubble SpaceTelescope, we determine that the average mass overdensity profile of the lensescan be fit with a power-law profile (Delta_Sigma prop. to R^{-0.86 +/- 0.16})that is within 1-sigma of an isothermal profile (Delta_Sigma prop. to R^{-1})with velocity dispersion sigma_v = 260 +/- 20 km/s. Additionally, we use atwo-component de Vaucouleurs+NFW model to disentangle the total mass profileinto separate luminous and dark matter components, and determine the relativefraction of each component. We measure the average rest frame V-band stellarmass-to-light ratio (Upsilon_V = 4.0 +/- 0.6 h M_sol/L_sol) and virialmass-to-light ratio (tau_V = 300 +/- 90 h M_sol/L_sol) for our sample,resulting in a virial-to-stellar mass ratio of M_vir/M_* = 75 +/- 25. Finally,we compare our results to a previous study using low redshift lenses, tounderstand how galaxy mass profiles evolve over time. We investigate theevolution of M_vir/M_*(z) = alpha(1+z)^{beta}, and find best fit parameters ofalpha = 51 +/- 36 and beta = 0.9 +/- 1.8, constraining the growth of virial tostellar mass ratio over the last ~7 Gigayears. We note that, by using a sampleof strong lenses, we are able to constrain the growth of M_vir/M_*(z) withoutmaking any assumptions about the IMF of the stellar population.

Cosmic Evolution of Virial and Stellar Mass in Massive Early-Type Galaxies