Weak lensing survey of galaxy clusters in the CFHTLS Deep

Abstract

AIMS: We present a weak lensing search of galaxy clusters in the 4 deg2 of the CFHT Legacy Survey Deep. This work aims at building a mass-selected sample of clusters. METHODS: We use the deep i' band images to perform weak lensing mass reconstructions and to identify high convergence peaks. Thanks to the availability of deep ugriz exposures, sources are selected from their photometric redshifts. We also use lensing tomography to derive an estimate of the lens redshift. After considering the raw statistics of peaks we check whether they can be associated to a clear optical counterpart or to published X-ray selected clusters. RESULTS: Among the 14 peaks found above a signal-to-noise detection threshold nu=3.5, eight are secure detections with estimated redshift 0.15<zl<0.6 and a velocity dispersion 450<sigma\_v<600 km/s. This low mass range is accessible thanks to the high density of background sources. We also use photometric redshifts of sources to test the effect of contamination by source-lens clustering for clusters detection. This latter turns out to play a minor role in our cluster sample. We study the intersection between the shear-selected clusters and XMM/LSS X-ray clusters in the D1 field. [ABRIDGED]

A&A accepted. Several major changes. Full version available at http://www.ast.obs-mip.fr/users/soucail/clusters_cfhtls.pdf

References in corpus (3)

• The XMM-LSS Survey: A well controlled X-ray cluster sample over the D1 CFHTLS area
• GaBoDS: The Garching-Bonn Deep Survey -- I. Anatomy of galaxy clusters in the background of NGC 300
• GaBoDS: The Garching-Bonn Deep Survey -- II. Confirmation of EIS cluster candidates by weak gravitational lensing

Cited by in corpus (8)

• Scaling relations and mass calibration of the X-ray luminous galaxy clusters at z~0.2: XMM-Newton observations
• BLOX: The Bonn Lensing, Optical, and X-ray selected galaxy clusters -- I. Cluster catalog construction
• Testing the reliability of weak lensing cluster detections
• Probing the Relation Between X-ray-Derived and Weak-Lensing-Derived Masses for Shear-Selected Galaxy Clusters: I. A781
• Shear-Selected Clusters From the Deep Lens Survey III: Masses from Weak Lensing
• Intrinsic alignments of galaxies and their effects on weak lensing detections of mass concentrations
• Detecting Mass Substructure in Galaxy Clusters: An Aperture Mass Statistic for Gravitational Flexion
• Orientations of very faint galaxies in the Coma cluster