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Observations of strong gravitational lensing, stellar kinematics, andlarger-scale tracers enable accurate measures of the distribution of darkmatter (DM) and baryons in massive early-type galaxies (ETGs). While suchtechniques have been applied to galaxy-scale and cluster-scale lenses, thepaucity of intermediate-mass systems with high-quality data has precluded auniform analysis of mass-dependent trends. With the aim of bridging this gap,we present new observations and analyses of 10 group-scale lenses at <z>=0.36characterized by Einstein radii theta_Ein=2.5"-5.1" and a mean halo mass ofM_200=10^14.0 Msol. We measure a mean concentration c_200=5.0+-0.8 consistentwith unmodified cold dark matter halos. By combining our data with other lenssamples, we analyze the mass structure of ETGs in 10^13 Msol-10^15 Msol halosusing homogeneous techniques. We show that the slope of the total densityprofile gamma_tot within the effective radius depends on the stellar surfacedensity, as demonstrated previously, but also on the halo mass. We analyzethese trends using halo occupation models and resolved stellar kinematics withthe goal of testing the universality of the DM profile. Whereas the centralgalaxies of clusters require a shallow inner DM density profile, group-scalelenses are consistent with a Navarro-Frenk-White profile or one that isslightly contracted. The largest uncertainties arise from the sample size andlikely radial gradients in stellar populations. We conclude that the net effectof baryons on the DM distribution may not be universal, but more likely varieswith halo mass due to underlying trends in star formation efficiency andassembly history.

Luminous and Dark Matter Profiles from Galaxies to Clusters: Bridging the Gap with Group-scale Lenses