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The X-ray properties of weak-lensing-selected galaxy clusters.

Giles, P. A. and Maughan, B. J. and Hamana, T. and Miyazaki, S. and Birkinshaw, M. and Ellis, R. S. and Massey, R. (2015) 'The X-ray properties of weak-lensing-selected galaxy clusters.', Monthly notices of the Royal Astronomical Society., 447 (4). pp. 3044-3059.


We present the results of an X-ray follow-up campaign targeting 10 weak-lensing (WL)-selected galaxy clusters from a Subaru WL survey. Archival Chandra data exist for two of the clusters, and we obtain dedicated observations of the remaining eight. The WL clusters appear to fit the same scaling relation between X-ray luminosity and temperature as X-ray-selected clusters. However, when we consider the luminosity–mass relation, the WL-selected clusters appear underluminous by a factor 2.1 ± 0.5 (or, alternatively, more massive by 1.7 ± 0.3), compared to X-ray-selected clusters with X-ray-based mass estimates. By considering the effects of the centroid offset, Eddington bias, and triaxiallity, this difference can be reconciled. We use X-ray imaging data to quantify the dynamical state of the clusters and found that one of the clusters appears dynamically relaxed, and two of the clusters host a cool core, consistent with Sunyaev–Zel'dovich-effect-selected clusters. This fraction is much lower than observed in X-ray-selected cluster samples.

Item Type:Article
Keywords:Galaxies: clusters: general, Cosmology: observations, X-rays: galaxies: clusters.
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Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:12 December 2014
Date deposited:18 February 2016
Date of first online publication:March 2015
Date first made open access:No date available

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