Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.204...33l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 204, July 1983, p. 33-43. Research supported by the Sci
Astronomy and Astrophysics
Astronomy
120
Astronomical Catalogs, Astronomical Models, Galactic Clusters, Spatial Distribution, Luminosity, Red Shift
Scientific paper
Models of the galaxy distribution are used to investigate the effects caused by the projection of non-cluster members on galaxy clusters. The models give estimates of the completeness of the Abell catalogue and its correctness in the selection of real clusters. The author estimates that the Abell catalogue contains 70 to 85 per cent of the rich clusters within z = 0.19 and also a significant fraction of false (i.e. non-physical) clusters. In the models 15 to 25 per cent of rich clusters have a true galaxy membership that is less than half the observed membership. The author presents the hypothesis that the excess of blue galaxies discovered in distant clusters by Butcher & Oemler is caused by miscalculation of the cluster membership.
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