CLASH: WEAK-LENSING SHEAR-AND-MAGNIFICATION ANALYSIS OF 20 GALAXY CLUSTERS

By Keiichi Umetsu, Elinor Medezinski, M. Nonino, Julian Merten, M. Postman, Massimo Meneghetti, M. Donahue, N. Czakon, A. Molino, Stella Seitz and 14 more. 2014

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We present a joint shear-and-magnification weak-lensing analysis of a sample of 16 X-ray-regular and 4 high-magnification galaxy clusters at 0.19 ≲ z ≲ 0.69 selected from the Cluster Lensing And Supernova survey with Hubble (CLASH). Our analysis uses wide-field multi-color imaging, taken primarily with Suprime-Cam on the Subaru Telescope. From a stacked-shear-only analysis of the X-ray-selected subsample, we detect the ensemble-averaged lensing signal with a total signal-to-noise ratio of ≃ 25 in the radial range of 200–3500 kpc h−1, providing integrated constraints on the halo profile shape and concentration–mass relation. The stacked tangential-shear signal is well described by a family of standard density profiles predicted for dark-matter-dominated halos in gravitational equilibrium, namely, the Navarro–Frenk–White (NFW), truncated variants of NFW, and Einasto models. For the NFW model, we measure a mean concentration of at an effective halo mass of . We show that this is in excellent agreement with Λ cold dark matter (ΛCDM) predictions when the CLASH X-ray selection function and projection effects are taken into account. The best-fit Einasto shape parameter is , which is consistent with the NFW-equivalent Einasto parameter of ∼0.18. We reconstruct projected mass density profiles of all CLASH clusters from a joint likelihood analysis of shear-and-magnification data and measure cluster masses at several characteristic radii assuming an NFW density profile. We also derive an ensemble-averaged total projected mass profile of the X-ray-selected subsample by stacking their individual mass profiles. The stacked total mass profile, constrained by the shear+magnification data, is shown to be consistent with our shear-based halo-model predictions, including the effects of surrounding large-scale structure as a two-halo term, establishing further consistency in the context of the ΛCDM model.

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Citations in the corpus

HUBBLE SPACE TELESCOPE COMBINED STRONG AND WEAK LENSING ANALYSIS OF THE CLASH SAMPLE: MASS AND MAGNIFICATION MODELS AND SYSTEMATIC UNCERTAINTIES (2014, methodology): “…concentration–mass relation from wide-field SL+WL nonparametric joint analysis, while comparing it to numerical simulations (Merten et al. 2014; Meneghetti et al. 2014), and published independent WL (Umetsu et al. 2014) and X-ray (Donahue et al. 2014) analyses for the majority of the sample.”
The Frontier Fields lens modelling comparison project (2016, background): “…tracers of the cluster gravitational potential, such as weak lensing, galaxy kinematics, and the X-ray emission from the Intra-Cluster-Medium (see e.g., Bradač et al. 2005; Donnarumma et al. 2011; Medezinski et al. 2013; Newman et al. 2013; Umetsu 2013; Umetsu et al. 2014; Merten et al. 2015).”
The Canadian Cluster Comparison Project: detailed study of systematics and updated weak lensing masses (2015, methodology): “It also describes the stacked lensing signal for ensembles of clusters well (e.g. Okabe et al. 2013; Umetsu et al. 2014).”
A UNIVERSAL MODEL FOR HALO CONCENTRATIONS (2014, result): “A good agreement between observations and simulations was recently reported for the results of the CLASH cluster lensing survey (Umetsu et al. 2014; Merten et al. 2014).”
CLASH: JOINT ANALYSIS OF STRONG-LENSING, WEAK-LENSING SHEAR, AND MAGNIFICATION DATA FOR 20 GALAXY CLUSTERS (2015, methodology): “Our regression results are in agreement with the SAWLENS analysis of Merten et al. (2015) and the stacked shear-only analysis of Umetsu et al. (2014).”