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

Titulo: 
CLASH: WEAK-LENSING SHEAR-AND-MAGNIFICATION ANALYSIS OF 20 GALAXY CLUSTERS
Autores: 
Umetsu, K; Medezinski, E; Nonino, M; Merten, J; Postman, M; Meneghetti, M; Donahue, M; Czakon, N; Molino, A; Seitz, S; Gruen, D; Lemze, D; Balestra, I; Benitez, N; Biviano, A; Broadhurst, T; Ford, H; Grillo, C; Koekemoer, A; Melchior, P; Mercurio, A; Moustakas, J; Rosati, P; Zitrin, A
Resumen: 
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 less than or similar to z less than or similar to 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 similar or equal to 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 c(200c) = 4.01(-0.32)(+0.35) at an effective halo mass of M-200c = 1.34(-0.09)(+0.10) x 10(15) M-circle dot. We show that this is in excellent agreement with. cold dark matter (Lambda CDM) predictions when the CLASH X-ray selection function and projection effects are taken into account. The best-fit Einasto shape parameter is alpha(E) = 0.191(-0.068)(+0.071), which is consistent with the NFW-equivalent Einasto parameter of similar to 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 Lambda CDM model.
Autor principal: 
Umetsu, K
Autor/es del IAA: 
Molino, Alberto; Benitez, Narciso
DOI: 
10.1088/0004-637X/795/2/163
Revista: 
ASTROPHYSICAL JOURNAL
Fecha de publicación: 
2014/11/10
Volumen: 
795
Issue: 
2
Tipo de documento: 
Article
Palabras clave: 
cosmology: observations; dark matter; galaxies: clusters: general; gravitational lensing: weak
Número de artículo: 
163