Mon. Not. R. Astron. Soc., 359, 417-446 (2005/May-2)
A Hubble Space Telescope lensing survey of X-ray luminous galaxy clusters - IV. Mass, structure and thermodynamics of cluster cores at z= 0.2.
SMITH G.P., KNEIB J.-P., SMAIL I., MAZZOTTA P., EBELING H. and CZOSKE O.
Abstract (from CDS):
We present a comprehensive space-based study of 10 X-ray luminous galaxy clusters (LX≥ 8x1044 erg/s, 0.1-2.4 keV) at z= 0.2. Hubble Space Telescope (HST) observations reveal numerous gravitationally lensed arcs for which we present four new spectroscopic redshifts, bringing the total to 13 confirmed arcs in this cluster sample. The confirmed arcs reside in just half of the clusters; we thus obtain a firm lower limit on the fraction of clusters with a central projected mass density exceeding the critical density required for strong lensing of 50 per cent. We combine the multiple-image systems with the weakly sheared background galaxies to model the total mass distribution in the cluster cores (R≤ 500 kpc). These models are complemented by high-resolution X-ray data from Chandra and used to develop quantitative criteria to classify the clusters as relaxed or unrelaxed. Formally, (30±20) per cent of the clusters form a relatively homogeneous subsample of relaxed clusters; the remaining (70±20) per cent are unrelaxed and are a much more diverse population. Most of the clusters therefore appear to be experiencing a cluster-cluster merger or relaxing after such an event. We also study the normalization and scatter of scaling relations between the cluster mass, the X-ray luminosity and the temperature. The scatter in these relations is dominated by the unrelaxed clusters and is typically σ≃ 0.4. Most notably, we detect two to three times more scatter in the mass-temperature relation than theoretical simulations and models predict. The observed scatter is also asymmetric - the unrelaxed clusters are systematically 40 per cent hotter than the relaxed clusters at 2.5σ significance. This structural segregation should be a major concern for experiments designed to constrain cosmological parameters using galaxy clusters. Overall our results are consistent with a scenario of cluster-cluster merger-induced boosts to cluster X-ray luminosities and temperatures.
gravitational lensing - galaxies: clusters: general - cosmology: observations - dark matter - large scale structure of Universe - X-rays: galaxies: clusters
Table C1: [SKS2005] A68 ANNa (Nos C0-C22) N=28, [SKS2005] A209 AN (Nos D0-D2), [SKS2005] A267 ANa (Nos E0-E2) N=4, [SKS2005] A773 ANN (Nos F0-F19), [SKS2005] A963 AN (Nos H0-H8), [SKS2005] A1763 ANa (Nos J0-J4) N=5, [SKS2005] A1835 AN (Nos K0-K3), [SKS2005] A2218 ANa (Nos M0-M4) N=14, [SKS2005] A2219 ANN (Nos P0-P14).
Status at CDS
All or part of tables of objects will not be ingested in SIMBAD.
Table C1: Arc in ACO 383 are [SKE2001] BNNa in SIMBAD.
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