The Sloan Lens ACS Survey. IV: the mass density profile of early-type galaxies out to 100 effective radii

Abstract

We present a weak gravitational lensing analysis of 22 early-type strong lens galaxies, based on deep HST images obtained as part of the Sloan Lens ACS Survey. Using the most advanced techniques to control systematic uncertainties related to the variable PSF and charge transfer efficiency of the ACS, we detect weak lensing signal out to 300 kpc/h. We analyze blank control fields from the COSMOS survey in the same manner, inferring that the residual systematic uncertainty in the tangential shear is <0.3%. A joint strong and weak lensing analysis shows that the average total mass density profile is consistent with isothermal over two decades in radius (3-300 kpc/h, approximately 1-100 Reff). This finding extends by over an order of magnitude in radius previous results, based on strong lensing and/or stellar dynamics, that luminous and dark component ``conspire'' to form an isothermal mass distribution. In order to disentangle the contributions of luminous and dark matter, we fit a two-component mass model (R^1/4 + NFW) to the weak and strong lensing constraints. It provides a good fit to the data with only two free parameters; i) the average stellar mass-to-light ratio M_*/L_V=4.48 +- 0.46 hMo/Lo, in agreement with that expected for an old stellar population; ii) the average virial mass-to-light ratio M_vir/L_V = 246+101-87 hMo/Lo. [abridged]

ApJ accepted. Minor changes for some numbers

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• Shedding Light on Dark Sectors with Gravitational Waves
• Multi-wavelength probes of distant lensed galaxies
• Lenses In VoicE (LIVE): Searching for strong gravitational lenses in the VOICE@VST survey using Convolutional Neural Networks
• The catalogue of virtual early-type galaxies from IllustrisTNG: validation and real observation consistency
• Cusped Mass Density Profiles and Magnification Ratios of Double Image Gravitational Lenses
• Systematics in ETG Mass Profile Modelling: Strong Lensing & Stellar Dynamics
• Multi-transonic spherical-type flows around massive black holes: galactic potential induced standing isothermal shocks
• Spacetime of rotating black holes surrounded by massive scalar charges
• Probing the Neutrino Seesaw Scale with Gravitational Waves
• Quiescent Galaxy Size, Velocity Dispersion, and Dynamical Mass Evolution
• Velocity Dispersions and Stellar Populations of the Most Compact and Massive Early-Type Galaxies at Redshift ~1
• SHARP VIII: J0924+0219 lens mass distribution and time-delay prediction through adaptive-optics imaging
• Galaxy And Mass Assembly: A Comparison between Galaxy-Galaxy Lens Searches in KiDS/GAMA
• Precision Joint Constraints on Cosmology and Gravity Using Strongly Lensed Gravitational Wave Populations
• A Parameter Space Exploration of High Resolution Numerically Evolved Early Type Galaxies Including AGN Feedback and Accurate Dynamical Treatment of Stellar Orbits