CLASH: Joint analysis of strong-lensing, weak-lensing shear, and magnification data for 20 galaxy clusters*

Journal Article · Wed Apr 20 00:00:00 EDT 2016 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/0004-637X/821/2/116· OSTI ID:1333874

Umetsu, Keiichi  ^[1]; Zitrin, Adi  ^[2]; Gruen, Daniel ^[3]; Merten, Julian ^[4]; Donahue, Megan  ^[5]; Postman, Marc ^[6]

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1. Academia Sinica, Taipei (Taiwan)
2. California Inst. of Technology (CalTech), Pasadena, CA (United States)
3. Univ.-Sternwarte, Munchen (Germany); Max-Planck-Institut fur extraterrestrische Physik, Garching (Germany); SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Palo Alto, CA (United States)
4. Univ. of Oxford, Oxford (United Kingdom)
5. Michigan State Univ., East Lansing, MI (United States)
6. Space Telescope Science Institute, Baltimore, MD (United States)

Here, 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 $$0.19\lesssim z\lesssim 0.69$$ 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 $$c{| }_{z=0.34}=3.95\pm 0.35$$ at M200c sime 14 × 1014 M⊙ and an intrinsic scatter of $$\sigma (\mathrm{ln}{c}_{200{\rm{c}}})=0.13\pm 0.06$$, 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 $${c}_{200{\rm{c}}}={3.79}_{-0.28}^{+0.30}$$ at $${M}_{200{\rm{c}}}={14.1}_{-1.0}^{+1.0}\times {10}^{14}\;{M}_{\odot }$$, demonstrating consistency between the complementary analysis methods.

• Research Organization: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC02-76SF00515
• OSTI ID: 1333874
• Report Number(s): 1333874
• Journal Information: The Astrophysical Journal (Online), Vol. 821, Issue 2; ISSN 1538-4357
• Publisher: Institute of Physics (IOP)
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
cosmology: observations
dark matter
galaxies: clusters: general
gravitational lensing: strong
gravitational lensing: weak