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CLASH: Joint Analysis of Strong-Lensing, Weak-Lensing Shear and Magnification Data for 20 Galaxy Clusters

Umetsu, Keiichi and Zitrin, Adi and Gruen, Daniel and Merten, Julian and Donahue, Megan and Postman, Marc (2016) CLASH: Joint Analysis of Strong-Lensing, Weak-Lensing Shear and Magnification Data for 20 Galaxy Clusters. Astrophysical Journal, 821 (2). Art. No. 116. ISSN 0004-637X.

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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 M_(200c) ≃ 14 × 10^(14) M_⊙ and an intrinsic scatter of σ(ln c_(200c) = 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 c_(200c) = 3.79_(-0.28)^(+0.30) at M_(200c) 14.1_(-1.0)^(+1.0) x 10^(14) M_☉, demonstrating consistency between the complementary analysis methods.

Item Type:Article
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URLURL TypeDescription Paper
Umetsu, Keiichi0000-0002-7196-4822
Zitrin, Adi0000-0002-0350-4488
Gruen, Daniel0000-0003-3270-7644
Donahue, Megan0000-0002-2808-0853
Postman, Marc0000-0002-9365-7989
Additional Information:© 2016. The American Astronomical Society. Received 2015 July 19; accepted 2016 March 2; published 2016 April 20. We thank the anonymous referees for their careful reading of the manuscript and useful suggestions. This work was made possible by the availability of high-quality lensing data produced by the CLASH team. We express our gratitude to all members of the CLASH team who enabled us to carry out the work. We thank all authors of Umetsu et al. (2014) and Zitrin et al. (2015) for their valuable contributions to the lensing analyses used here. We thank John Moustakas for his assistance in the early stages of this work. We thank Massimo Meneghetti and Elinor Medezinski for providing useful information and suggestions. We acknowledge very fruitful discussions with Mauro Sereno, Nobuhiro Okabe, Bau-Ching Hsieh, Benedikt Diemer, Nicole Czakon, Tom Broadhurst, Masahiro Takada, Jens Hjorth, Liliya L.R. Williams, and Graham Smith. This work is partially supported by the Ministry of Science and Technology of Taiwan under the grants MOST 103-2112-M-001-030-MY3 and MOST 103-2112-M-001-003-MY3. AZ acknowledges support by NASA through Hubble Fellowship Grant HST-HF2-51334.001-A awarded by STScI. JM is supported by the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme (FP7/2007-2013) under REA grant agreement number 627288. DG was supported by SFB-Transregio 33 "The Dark universe" by the Deutsche Forschungsgemeinschaft (DFG), the DFG cluster of excellence "Origin and Structure of the Universe," and NASA through the Einstein Fellowship Program, grant PF5-160138.
Funding AgencyGrant Number
Ministry of Science and Technology (Taipei)MOST 103-2112-M-001-030-MY3
NASA Hubble FellowshipHST-HF2-51334.001-A
Marie Curie Fellowship627288
Deutsche Forschungsgemeinschaft (DFG)SFB/Transregio 33
NASA Einstein Fellowship ProgramPF5-160138
Subject Keywords:cosmology: observations; dark matter; galaxies: clusters: general; gravitational lensing: strong; gravitational lensing: weak
Record Number:CaltechAUTHORS:20160623-110702123
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Official Citation:Keiichi Umetsu et al 2016 ApJ 821 116
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:68634
Deposited By: Ruth Sustaita
Deposited On:23 Jun 2016 22:03
Last Modified:27 Mar 2019 20:15

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