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The mass distribution in massive elliptical galaxies encodes theirevolutionary history, thus providing an avenue to constrain the baryonicastrophysics in their evolution. The power-law assumption for the radial massprofile in ellipticals has been sufficient to describe several observables tothe noise level, including strong lensing and stellar dynamics. In this paper,we quantitatively constrained any deviation, or the lack thereof, from thepower-law mass profile in massive ellipticals through joint lensing-dynamicsanalysis of a large statistical sample with 77 galaxy-galaxy lens systems. Weperformed an improved and uniform lens modelling of these systems from archivalHubble Space Telescope imaging using the automated lens modelling pipelinedolphin. We combined the lens model posteriors with the stellar dynamics toconstrain the deviation from the power law after accounting for theline-of-sight lensing effects, a first for analyses on galaxy-galaxy lenses. Wefind that the Sloan Lens ACS Survey (SLACS) lens galaxies with a mean redshiftof 0.2 are consistent with the power-law profile within 1.1$\sigma$(2.8$\sigma$) and the Strong Lensing Legacy Survey (SL2S) lens galaxies with amean redshift of 0.6 are consistent within 0.8$\sigma$ (2.1$\sigma$), for aspatially constant (Osipkov-Merritt) stellar anisotropy profile. We adopted thespatially constant anisotropy profile as our baseline choice based on previousdynamical observables of local ellipticals. However, spatially resolved stellarkinematics of lens galaxies are necessary to differentiate between the twoanisotropy models. Future studies will use our lens models to constrain themass distribution individually in the dark matter and baryonic components.

Project Dinos I: A joint lensing-dynamics constraint on the deviation from the power law in the mass profile of massive ellipticals