2017/05/11 by Rossella Licitra, S. Mei, Licitra, Rossella +7 · 1 citation
Physics and Astronomy · #Astronomy and Astrophysical Research #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Scientific Research and Discoveries
paper · doi:10.48550/arxiv.1705.04331
openalex publication_date 2017/05/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 ∼ 80% pure up to z ∼ 1, and ∼ 100% (∼ 70%) complete at z≤ 0.6 ( z\lesssim1) for galaxy clusters with M \gtrsim 1014 \rm M\odot at the CFHT-LS Wide depth. In the CFHT-LS W1, we detect 11 cluster candidates per \rm deg2 out to z∼1.1. 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 M \gtrsim 1014 \rm M\odot. 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 σlnM|λ=0.39±0.07 and σlnM|λ=0.30±0.13 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 93% of the redMaPPer detections, and find that its richness estimates is on average ∼ 40-50% larger than ours at z>0.3. RedGOLD recovers X-ray cluster spectroscopic redshifts at better than 5% up to z∼1, and the centers within a few tens of arcseconds.