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It is shown that galaxy cluster surveys selecting clusters by their X-rayluminosity effectively select by cluster mass. It is shown that a selectionbased solely on Abell galaxy richness is less efficient in terms of mass.Furthermore the empirical X-ray luminosity - gravitational mass relation andits scatter is quantified and the relation is compared to predicted relations.

Relating Galaxy Cluster X-Ray Luminosities to Gravitational Masses in Wide-Angle Surveys