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We use CFHTLS deep optical data, WIRCam Deep Survey (WIRDS) NIR data and XMMdata to identify z>1.1 clusters in the CFHTLS D1 and D4 fields. Counterparts tosuch clusters can not be identified without deep NIR data and as such the totalof =1deg2 of J , H & Ks band imaging provided by WIRDS is an indispensable toolin such work. Using public XMM X-ray data, we identify extended X-ray sourcesin the two fields. The resulting catalogue of extended X-ray sources wasanalyzed for optical/NIR counterparts, using a red-sequence algorithm.Redshifts of candidate groups and clusters were estimated using the medianphotometric redshifts of detected counterparts and where availablespectroscopic data. Additionally, we surveyed X-ray point sources for potentialgroup systems at the limit of our detection range in the X-ray data. Acatalogue of z > 1.1 cluster candidates in the two fields has been compiled andcluster masses, radii and temperatures have been estimated using the scalingrelations. The catalogue consists of 15 z > 1.1 candidates. Three of thedetections are previously published extended X-ray sources. Of note is JKSC 041for which we identify possible structures at z = 0.8, z = 0.96, z = 1.13 and z= 1.49. We also make an independent detection of the massive cluster, XMMXCSJ2215.9-1738. We use the z > 1.1 catalogue to compare the cluster number countsin these fields with models based on WMAP 7-year cosmology and find that themodels slightly over-predict the observations, whilst at z>1.5 we do not detectany clusters. We note that cluster number counts at z > 1.1 are highlysensitive to the cosmological model, however a significant reduction in presentstatistical (due to available survey area) and systematic (due to clusterscaling relations) uncertainties is required in order to confidently constraincosmological parameters using cluster number counts at high redshift.

The WIRCAM Deep Infrared Cluster Survey I: Groups and Clusters at z > 1.1