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

Giles, P.A.; Maughan, B.J.; Hamana, T.; Miyazaki, S.; Birkinshaw, M.; Ellis, R.S.; Massey, R.

Abstract

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.

Citation

Giles, P., Maughan, B., Hamana, T., Miyazaki, S., Birkinshaw, M., Ellis, R., & Massey, R. (2015). The X-ray properties of weak-lensing-selected galaxy clusters. Monthly Notices of the Royal Astronomical Society, 447(4), 3044-3059. https://doi.org/10.1093/mnras/stu2679

• Journal Article Type: Article
• Acceptance Date: Dec 12, 2014
• Publication Date: Mar 11, 2015
• Deposit Date: Feb 10, 2016
• Publicly Available Date: Feb 18, 2016
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Royal Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 447
• Issue: 4
• Pages: 3044-3059
• DOI: https://doi.org/10.1093/mnras/stu2679
• Keywords: Galaxies: clusters: general, Cosmology: observations, X-rays: galaxies: clusters.
• Public URL: https://durham-repository.worktribe.com/output/1419958