SIMBAD references

We measure the total-mass-density profiles out to three effective radii for a sample of 63z ∼ 0.5, massive early-type galaxies (ETGs) acting as strong gravitational lenses through a joint analysis of lensing and stellar dynamics. The compilation is selected from three galaxy-scale strong-lens samples, namely the Baryon Oscillation Spectroscopic Survey (BOSS) Emission-Line Lens Survey (BELLS), the BELLS for GALaxy-Lyα EmitteR sYstems Survey (BELLS GALLERY), and the Strong Lensing Legacy Survey (SL2S). Utilizing the wide source-redshift coverage (0.8-3.5) provided by these three samples, we build a statistically significant ensemble of massive ETGs for which robust mass measurements can be achieved within a broad range of Einstein radii up to three effective radii. Characterizing the three-dimensional total-mass-density distribution by a power-law profile as ρ ∝ r^–γ, we find that the average logarithmic density slope for the entire sample is <γ>=2.000_–0.032^+0.033 (68 per cent CL) with an intrinsic scatter of δ=0.180_–0.028^+0.032. Further parametrizing <γ> as a function of redshift z and the ratio of Einstein radius to effective radius R_ein/R_eff, we find that the average density distributions of these massive ETGs become steeper at later cosmic times and at larger radii, with magnitudes d <γ>/ dz=-0.309_–0.160^+0.166 and d <γ>/ d log₁₀ (R_ ein_/R eff_)=0.194-0.083_^+0.092.