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Article Contents

ABSTRACT

1.INTRODUCTION

2.OPTICAL PROPERTIES OF GALAXY CLUSTERS

2.1.Typical Properties of Clusters and Groups

2.2.Distribution of Clusters with Richness and Distance

2.3.Number Density of Clusters

2.4.Fraction of Galaxies in Clusters

2.5.Galaxy Overdensity in Rich Clusters

2.6.Density Profile

2.7.Central Density and Core Size

2.8.Galactic Content in Rich Clusters

2.9.Velocity Dispersion

2.10.Mass, Luminosity, and Mass-to-Luminosity Ratio

2.11.Cluster Classification

3.X-RAY PROPERTIES OF GALAXY CLUSTERS

3.1.X-Ray Emission from Clusters

3.2.X-Ray Properties of Clusters

3.3.The Intracluster Gas: Some Relevant Questions

3.4.The Intracluster Gas: Hydrostatic Equilibrium?

3.5.The Relation between Gas and Galaxies

3.6.Metal Abundance in Intracluster Gas

3.7.X-Ray-Optical Correlations of Cluster Properties

3.8.The X-Ray Luminosity Function of Clusters

3.9.Cooling Flows in Clusters

3.10.The Sunyaev-Zeldovich Effect in Clusters

4.THE BARYON FRACTION IN CLUSTERS

5.CLUSTER MASSES

6.WHERE IS THE DARK MATTER?

7.THE MASS FUNCTION OF CLUSTERS

8.QUASAR-CLUSTER ASSOCIATION

9.SUPERCLUSTERS

9.1.Supercluster Properties

9.2.Superclusters and Pencil-Beam Surveys

10.THE CLUSTER CORRELATION FUNCTION

11.PECULIAR MOTIONS OF CLUSTERS

12.SOME UNSOLVED PROBLEMS

REFERENCES