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The PCA Lens-Finder: application to CFHTLS

机译:PCA Lens-Finder:应用于CFHTLS

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We present the results of a new search for galaxy-scale strong lensing systems in CFHTLS Wide. Our lens-finding technique involves a preselection of potential lens galaxies, applying simple cuts in size and magnitude. We then perform a Principal Component Analysis of the galaxy images, ensuring a clean removal of the light profile. Lensed features are searched for in the residual images using the clustering topometric algorithm DBSCAN. We find 1098 lens candidates that we inspect visually, leading to a cleaned sample of 109 new lens candidates. Using realistic image simulations we estimate the completeness of our sample and show that it is independent of source surface brightness, Einstein ring size (image separation) or lens redshift. We compare the properties of our sample to previous lens searches in CFHTLS. Including the present search, the total number of lenses found in CFHTLS amounts to 678, which corresponds to ~ 4 lenses per square degree down to i ( AB ) = 24.8 . This is equivalent to ~ 60.000 lenses in total in a survey as wide as Euclid, but at the CFHTLS resolution and depth.
机译:我们介绍了CFHTLS Wide中星系规模强透镜系统的新搜索结果。我们的镜头寻找技术涉及对潜在的镜头星系进行预选,并在尺寸和大小上进行简单的切割。然后,我们对银河系图像执行主成分分析,以确保完全清除光线轮廓。使用聚类拓扑算法DBSCAN在残差图像中搜索镜头特征。我们找到了1098个我们目视检查的镜头候选者,从而产生了109个新镜头候选者的清洁样本。使用逼真的图像模拟,我们估计了样品的完整性,并表明它与光源表面亮度,爱因斯坦环尺寸(图像分离)或镜头红移无关。我们将样本的属性与CFHTLS中以前的镜头搜索进行了比较。包括当前的搜索在内,在CFHTLS中发现的透镜总数为678,相当于每平方度约有4个透镜,直至i(AB)= 24.8。在一个像欧几里得一样宽的调查中,这相当于约60.000透镜,但以CFHTLS分辨率和深度进行。

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