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

• DOI: 10.48550/arxiv.2311.09307
• Publication Date: 2023-01-01
• Authors: Chin Yi Tan; Anowar J. Shajib; Simon Birrer; Alessandro Sonnen...; Tommaso Treu; Patrick H. Wells; Devon Williams; E. Buckley‐Geer; A. Drlica-Wagner; J. Frieman
• Keywords: Strong gravitational lensing; Stellar kinematics

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