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Distant galaxy clusters in the XMM large scale structure survey
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Willis, J. P., Clerc, N., Bremer, M. N., Pierre, M., Adami, C., Ilbert, O., Maughan, B., Maurogordato, S., Pacaud, F., Valtchanov, I., Chiappetti, L., Thanjavur, K., Gwyn, S., Stanway, Elizabeth R. and Winkworth, C. (2013) Distant galaxy clusters in the XMM large scale structure survey. Monthly Notices of the Royal Astronomical Society, Volume 430 (Number 1). pp. 134-156. doi:10.1093/mnras/sts540 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/sts540
Abstract
Distant galaxy clusters provide important tests of the growth of large-scale structure in addition to highlighting the process of galaxy evolution in a consistently defined environment at large look-back time. We present a sample of 22 distant (z > 0.8) galaxy clusters and cluster candidates selected from the 9 deg2 footprint of the overlapping X-ray Multi Mirror (XMM) Large Scale Structure (LSS), CFHTLS-Wide and Spitzer-SWIRE surveys. Clusters are selected as extended X-ray sources with an accompanying overdensity of galaxies displaying optical to mid-infrared photometry consistent with z > 0.8. Nine clusters have confirmed spectroscopic redshifts in the interval 0.8 < z < 1.2, four of which are presented here for the first time. A further 11 candidate clusters have between 8 and 10 band photometric redshifts in the interval 0.8 < z < 2.2, while the remaining two candidates do not have information in sufficient wavebands to generate a reliable photometric redshift. All of the candidate clusters reported in this paper are presented for the first time. Those confirmed and candidate clusters with available near-infrared photometry display evidence for a red sequence galaxy population, determined either individually or via a stacking analysis, whose colour is consistent with the expectation of an old, coeval stellar population observed at the cluster redshift. We further note that the sample displays a large range of red fraction values indicating that the clusters may be at different stages of red sequence assembly. We compare the observed X-ray emission to the flux expected from a suite of model clusters and find that the sample displays an effective mass limit M200 ∼ 1 × 1014 M⊙ with all clusters displaying masses consistent with M200 < 5 × 1014 M⊙. This XMM distant cluster study represents a complete sample of X-ray-selected z > 0.8 clusters. We discuss the importance of this sample to investigate the abundance of high-redshift clusters and to provide a relatively unbiased view of distant cluster galaxy populations.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||
Publisher: | Oxford University Press | ||||
ISSN: | 0035-8711 | ||||
Official Date: | 21 March 2013 | ||||
Dates: |
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Volume: | Volume 430 | ||||
Number: | Number 1 | ||||
Page Range: | pp. 134-156 | ||||
DOI: | 10.1093/mnras/sts540 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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