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

Abstract

We use CFHTLS deep optical data, WIRCam Deep Survey (WIRDS) NIR data and XMM data to identify z>1.1 clusters in the CFHTLS D1 and D4 fields. Counterparts to such clusters can not be identified without deep NIR data and as such the total of =1deg2 of J , H & Ks band imaging provided by WIRDS is an indispensable tool in such work. Using public XMM X-ray data, we identify extended X-ray sources in the two fields. The resulting catalogue of extended X-ray sources was analyzed for optical/NIR counterparts, using a red-sequence algorithm. Redshifts of candidate groups and clusters were estimated using the median photometric redshifts of detected counterparts and where available spectroscopic data. Additionally, we surveyed X-ray point sources for potential group systems at the limit of our detection range in the X-ray data. A catalogue of z > 1.1 cluster candidates in the two fields has been compiled and cluster masses, radii and temperatures have been estimated using the scaling relations. The catalogue consists of 15 z > 1.1 candidates. Three of the detections are previously published extended X-ray sources. Of note is JKSC 041 for 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, XMMXCS J2215.9-1738. We use the z > 1.1 catalogue to compare the cluster number counts in these fields with models based on WMAP 7-year cosmology and find that the models slightly over-predict the observations, whilst at z>1.5 we do not detect any clusters. We note that cluster number counts at z > 1.1 are highly sensitive to the cosmological model, however a significant reduction in present statistical (due to available survey area) and systematic (due to cluster scaling relations) uncertainties is required in order to confidently constrain cosmological parameters using cluster number counts at high redshift.

22 pages, 22 figures, Accepted 4 August 2010

References in corpus (11)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• COSMOS Photometric Redshifts with 30-bands for 2-deg2
• Stellar and total baryon mass fractions in groups and clusters since redshift 1
• The XMM-Newton wide-field survey in the COSMOS field: VI. Statistical properties of clusters of galaxies
• The XMM Cluster Survey: A Massive Galaxy Cluster at z=1.45
• The L_X--M relation of Clusters of Galaxies
• BLOX: The Bonn Lensing, Optical, and X-ray selected galaxy clusters -- I. Cluster catalog construction
• The XMM Cluster Survey: The Dynamical State of XMMXCS J2215.9-1738 at z=1.457
• Testing anthropic predictions for Lambda and the CMB temperature
• Anomalous SZ Contribution to 3 Year WMAP Data
• Several New Active Galactic Nuclei Among X-ray Sources Detected by INTEGRAL and SWIFT Observatories

Cited by in corpus (9)

• The Chandra Deep Fields: Lifting the Veil on Distant Active Galactic Nuclei and X-Ray Emitting Galaxies
• Mining the gap: evolution of the magnitude gap in X-ray galaxy groups from the 3 square degree XMM coverage of CFHTLS
• Ultra-deep catalog of X-ray groups in the Extended Chandra Deep Field South
• X-Ray Groups of Galaxies in the Aegis Deep and Wide Fields
• Brightest X-ray clusters of galaxies in the CFHTLS wide fields: Catalog and optical mass estimator
• The evolution of star formation activity in galaxy groups
• Galaxy clusters in the SDSS Stripe 82 based on galaxy photometric redshifts
• Halo Mass-Concentration Relation at High-Mass End
• The Jet Paths of Radio AGN and their Cluster Weather