Stacked strong and weak lensing united: Improved measurement of the stellar and dark matter distributions in massive early-type galaxies at z about 0.5

We present a new measurement of the stellar and dark matter distributions in massive early-type galaxies at redshift 0.4<z<0.6 by combining stacked strong and weak lensing measurements. The stacked weak lensing measurements down to the small radius of 0.013, Mpc/h enabled by the Subaru Telescope Hyper Suprime-Cam data are combined with stacked enclosed projected mass measurements from 13 strong lens systems. We find that adding strong lensing constraints improves constraints on the stellar and dark matter distributions. The central dark matter profile is found to be consistent with the standard Navarro-Frenk-White density profile. The stellar initial mass function is found to be bottom-heavy. The total density profile in the inner region is described well by the power-law density profile with the slope of-1.96 plus or minus 0.07, which can also explain weak lensing signals out to 1, Mpc/h reasonably well. The stacked weak lensing profile constrains an internal mass-sheet transformation parameter to λ c=0.978 plus or minus0.010. Our analysis demonstrates that the combination of the stacked strong and weak lensing serves as a powerful tool for studying central density profiles of galaxies.