Structure Formation and Cosmology with high-z Clusters
Lecture4 - USP
Lecture4 - USP
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What makes a cluster an efficient gravitational telescope(besides geometrical considerations, DL,DS,DLS) ?• Lensing efficiency (e.g. measured from the number of multiple images)depends from factors which lead to increase the critical area:– ellipticity– degree of merging– degree of substructure– cluster concentration (the <strong>high</strong>er c, the <strong>high</strong>er the lensing efficiencyCritical curve for zs=1.9Zitrin et al. 2012