The RedGOLD Cluster Detection Algorithm and its Cluster Candidate Catalogue for the CFHT-LS W1

RedGOLD searches for red-sequence galaxy overdensities while minimizing contamination from dusty star-forming galaxies. It imposes an NFW profile and calculates cluster detection significance and richness. We optimize these latter two parameters using both simulations and X-ray detected cluster catalogs, and obtain a catalog pure up to , and ( ) complete at ( ) for galaxy clusters with at the CFHT-LS Wide depth. In the CFHT-LS W1, we detect 11 cluster candidates per out to . When we optimize both completeness and purity, RedGOLD obtains a cluster catalog with higher completeness and purity than other public catalogs, obtained using CFHT-LS W1 observations, for . We use X-ray detected cluster samples to extend the study of the X-ray temperature-optical richness relation to a lower mass threshold, and find a mass scatter at fixed richness of and for the Gozaliasl et al. (2014) and Mehrtens et al. (2012) samples. When considering similar mass ranges as previous work, we recover a smaller scatter in mass at fixed richness. We recover of the redMaPPer detections, and find that its richness estimates is on average larger than ours at . RedGOLD recovers X-ray cluster spectroscopic redshifts at better than up to , and the centers within a few tens of arcseconds.