Galaxy clusters in the CFHTLS. First matched filter candidate catalogue of the Deep fields
Abstract
We apply a matchedfilter cluster detection algorithm to the CanadaFranceHawaii Telescope Legacy Survey (CFHTLS) iband data for the Deep1, Deep2, Deep3 and Deep4 fields covering a total of 4 square degrees. To test the implemented procedure we carry out simulations for assessing the frequency of noise peaks as well as estimate the recovery efficiency. We estimate that up to z∼0.7 the catalogue is essentially complete for clusters of richness class R ⪆ 1. The recovered redshifts are in general overestimated by Δ z=0.1 with a scatter of σ_{Δ z}∼0.1, except at redshifts z ⪆ 1 where the estimated redshifts are systematically underestimated. The constructed cluster candidate catalogue contains 162 detections over an effective area of 3.112 square degrees corresponding to a density of ~52.1 per square degree. The median estimated redshift of the candidates is z=0.6. The estimated noise frequency is 16.9±5.4 detections per square degree. From visual inspection we identify systems that show a clear concentration of galaxies with similar colour. These systems have a density of ~20 per square degree.
 Publication:

Astronomy and Astrophysics
 Pub Date:
 January 2007
 DOI:
 10.1051/00046361:20066088
 arXiv:
 arXiv:astroph/0609815
 Bibcode:
 2007A&A...461...81O
 Keywords:

 methods: data analysis;
 surveys;
 galaxies: clusters: general;
 cosmology: largescale structure of Universe;
 Astrophysics
 EPrint:
 15 pages, 15 figures, accepted for publication in A&