2012MNRAS.419.3280S


C.D.S. - SIMBAD4 rel 1.7 - 2020.06.02CEST11:09:17

2012MNRAS.419.3280S - Mon. Not. R. Astron. Soc., 419, 3280-3291 (2012/February-1)

Triaxial strong-lensing analysis of the z > 0.5 MACS clusters: the mass-concentration relation.

SERENO M. and ZITRIN A.

Abstract (from CDS):

The high concentrations derived for several strong-lensing clusters present a major inconsistency between theoretical Λ cold dark matter (ΛCDM) expectations and measurements. Triaxiality and orientation biases might be at the origin of this disagreement, as clusters elongated along the line of sight would have a relatively higher projected mass density, boosting the resulting lensing properties. Analyses of statistical samples can probe further these effects and crucially reduce biases. In this work we perform a fully triaxial strong-lensing analysis of the 12 Massive Cluster Survey (MACS) clusters at z > 0.5, a complete X-ray-selected sample, and fully account for the impact of the intrinsic 3D shapes on their strong-lensing properties. We first construct strong-lensing mass models for each cluster based on multiple images, and fit projected ellipsoidal Navarro-Frenk-White haloes with arbitrary orientations to each mass distribution. We then invert the measured surface mass densities using Bayesian statistics. Although the Einstein radii of this sample are significantly larger than those predicted by ΛCDM, here we find that the mass-concentration relation is in full agreement with results from N-body simulations. The z > 0.5 MACS clusters suffer from a moderate form of the orientation bias as may be expected for X-ray-selected samples. Being mostly unrelaxed, at a relatively high redshift, with high X-ray luminosity and notable substructures, these clusters may lie outside the standard concentration-Einstein radius relation. Our results remark the importance of triaxiality and properly selected samples for understanding galaxy clusters properties and suggest that for higher-z, unrelaxed low-concentration clusters form a different class of prominent strong gravitational lenses. Arc redshift confirmation and weak-lensing data in the outer region are needed to further refine our analysis.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): methods: statistical - galaxies: clusters: general - galaxies: clusters: MACS {em z}>0.5 sample

Status at CDS:  

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 472 0
2 MCS J0025.4-1222 ClG 00 25 29.381 -12 22 37.06           ~ 116 0
3 MCS J0257.1-2325 ClG 02 57 09.151 -23 26 05.83           ~ 51 0
4 ClG 0451-03 ClG 04 54 10.9 -03 01 07     20.0     ~ 328 0
5 ClG J0647+7015 ClG 06 47 50.0 +70 14 55           ~ 125 0
6 B3 0714+378 Rad 07 17 36.50 +37 45 23.0           ~ 169 2
7 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 350 0
8 ClG J0744+3927 ClG 07 44 52.5 +39 27 30           ~ 156 0
9 RXC J0911.1+1746 ClG 09 11 11.277 +17 46 31.94           ~ 53 0
10 MCS J1149.5+2223 ClG 11 49 35.8 +22 23 55           ~ 316 0
11 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1017 0
12 ClG J1423+2404 ClG 14 23 47.7 +24 04 40           ~ 173 0
13 ClG J2129-0741 ClG 21 29 26.0 -07 41 28           ~ 129 0
14 RXC J2214.9-1400 ClG 22 14 57.3 -14 00 12           ~ 71 0

    Equat.    Gal    SGal    Ecl

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2020.06.02-11:09:17

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