We present results from a comprehensive lensing analysis in Hubble SpaceTelescope (HST) data of the complete Cluster Lensing And Supernovasurvey with Hubble cluster sample. We identify previously undiscoveredmultiple images allowing improved or first constraints on the clusterinner mass distributions and profiles. We combine these strong lensingconstraints with weak lensing shape measurements within the HST field ofview (FOV) to jointly constrain the mass distributions. The analysis isperformed in two different common parameterizations (one adoptslight-traces-mass for both galaxies and dark matter while the otheradopts an analytical elliptical Navarro-Frenk-White form for the darkmatter) to provide a better assessment of the underlyingsystematics—which is most important for deep cluster-lensingsurveys especially when studying magnified high-redshift objects. Wefind that the typical (median) relative systematic differencesthroughout the central FOV are ~40% in the (dimensionless) mass densityκ and ~20% in the magnification μ. We show maps of thesedifferences for each cluster as well as the mass distributionscritical curves and two-dimensional (2D)-integrated mass profiles. Forthe Einstein radii (z_s = 2) we find that all typically agreewithin 10% between the two models and Einstein masses agree typicallywithin ~15%. At larger radii the total projected 2D-integrated massprofiles of the two models within r ~ 2' differ by ~30%. Stacking thesurface-density profiles of the sample from the two methods together weobtain an average slope of dlog (Σ)/dlog (r) ~ -0.64± 0.1 in the radial range [5350] kpc. Last we also characterizethe behavior of the average magnification surface density and sheardifferences between the two models as a function of both the radius fromthe center and the best-fit values of these quantities. All mass modelsand magnification maps are made publicly available for the community.
Hubble Space Telescope Combined Strong and Weak Lensing Analysis of the CLASH Sample: Mass and Magnification Models and Systematic
Mercurio A;
2015-01-01
Abstract
We present results from a comprehensive lensing analysis in Hubble SpaceTelescope (HST) data of the complete Cluster Lensing And Supernovasurvey with Hubble cluster sample. We identify previously undiscoveredmultiple images allowing improved or first constraints on the clusterinner mass distributions and profiles. We combine these strong lensingconstraints with weak lensing shape measurements within the HST field ofview (FOV) to jointly constrain the mass distributions. The analysis isperformed in two different common parameterizations (one adoptslight-traces-mass for both galaxies and dark matter while the otheradopts an analytical elliptical Navarro-Frenk-White form for the darkmatter) to provide a better assessment of the underlyingsystematics—which is most important for deep cluster-lensingsurveys especially when studying magnified high-redshift objects. Wefind that the typical (median) relative systematic differencesthroughout the central FOV are ~40% in the (dimensionless) mass densityκ and ~20% in the magnification μ. We show maps of thesedifferences for each cluster as well as the mass distributionscritical curves and two-dimensional (2D)-integrated mass profiles. Forthe Einstein radii (z_s = 2) we find that all typically agreewithin 10% between the two models and Einstein masses agree typicallywithin ~15%. At larger radii the total projected 2D-integrated massprofiles of the two models within r ~ 2' differ by ~30%. Stacking thesurface-density profiles of the sample from the two methods together weobtain an average slope of dlog (Σ)/dlog (r) ~ -0.64± 0.1 in the radial range [5350] kpc. Last we also characterizethe behavior of the average magnification surface density and sheardifferences between the two models as a function of both the radius fromthe center and the best-fit values of these quantities. All mass modelsand magnification maps are made publicly available for the community.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
