CLASH: JOINT ANALYSIS of STRONG-LENSING, WEAK-LENSING SHEAR, and MAGNIFICATION DATA for 20 GALAXY CLUSTERS

Keiichi Umetsu, Adi Zitrin, Daniel Gruen, Julian Merten, Megan Donahue, Marc Postman

Research output: Contribution to journalArticlepeer-review

158 Scopus citations

Abstract

We present a comprehensive analysis of strong-lensing, weak-lensing shear and magnification data for a sample of 16 X-ray-regular and 4 high-magnification galaxy clusters at 0.19 ≲ z ≲ 0.69 selected from Cluster Lensing And Supernova survey with Hubble (CLASH). Our analysis combines constraints from 16-band Hubble Space Telescope observations and wide-field multi-color imaging taken primarily with Suprime-Cam on the Subaru Telescope, spanning a wide range of cluster radii (10″-16′). We reconstruct surface mass density profiles of individual clusters from a joint analysis of the full lensing constraints, and determine masses and concentrations for all of the clusters. We find the internal consistency of the ensemble mass calibration to be ≤5% ± 6% in the one-halo regime (200-2000 kpc h-1) compared to the CLASH weak-lensing-only measurements of Umetsu et al. For the X-ray-selected subsample of 16 clusters, we examine the concentration-mass (c-M) relation and its intrinsic scatter using a Bayesian regression approach. Our model yields a mean concentration of c|z=0.34 = 3.95 ± 0.35 at M200c ≃14 × 1014M and an intrinsic scatter of σ (ln c200c) = 0.13 ± 0.06, which is in excellent agreement with Λ cold dark matter predictions when the CLASH selection function based on X-ray morphological regularity and the projection effects are taken into account. We also derive an ensemble-averaged surface mass density profile for the X-ray-selected subsample by stacking their individual profiles. The stacked lensing signal is detected at 33σ significance over the entire radial range ≤4000 kpc h-1, accounting for the effects of intrinsic profile variations and uncorrelated large-scale structure along the line of sight. The stacked mass profile is well described by a family of density profiles predicted for cuspy dark-matter-dominated halos in gravitational equilibrium, namely, the Navarro-Frenk-White (NFW), Einasto, and DARKexp models, whereas the single power-law, cored isothermal and Burkert density profiles are disfavored by the data. We show that cuspy halo models that include the large-scale two-halo term provide improved agreement with the data. For the NFW halo model, we measure a mean concentration of c200c= 3.79+0.30 -0.28 at M200c= 14.1+1.0 -1.0 × 1014 M, demonstrating consistency between thecomplementary analysis methods.

Original languageEnglish
Article number116
JournalAstrophysical Journal
Volume821
Issue number2
DOIs
StatePublished - 20 Apr 2016
Externally publishedYes

Keywords

  • cosmology: observations
  • dark matter
  • galaxies: clusters: general
  • gravitational lensing: strong
  • gravitational lensing: weak

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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