Projection Effects in the Abell Catalogue
M. P. van Haarlem
Abstract
We investigate the influence that projection effects have on the completeness of the the Abell cluster catalogue in the context of an Ω0=1 CDM Universe. We construct a galaxy catalogue and identify clusters using an algorithm that mimics Abell's method. Over 30% of Richness Class ≥1 clusters have been selected despite not meeting the required intrinsic (3D) richness criterion. Velocity dispersions are shown to have been systematically overestimated.
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