Weak lensing survey of galaxy clusters in the CFHTLS Deep

Raphael Gavazzi (1) , Genevieve Soucail (1)

1 LATT - Laboratoire d'Astrophysique de l'Observatoire Midi-Pyrénées

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

Mots clés: Gravitational lensing; Galaxies: clusters: general; Cosmologie: Large-scale structure

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Astrophysique [astro-ph]

Raphael Gavazzi, Genevieve Soucail. Weak lensing survey of galaxy clusters in the CFHTLS Deep. 2006. ⟨hal-00071677v3⟩