Annu. Rev. Astron. Astrophys. 1982. 20: 547-85 Copyright © 1982 by Annual Reviews. All rights reserved

Reprinted with kind permission from Annual Reviews Inc., 4139 El Camino Way, Palo Alto, California, USA

Table of Contents

INTRODUCTION

Description of the Einstein Observatory Focal Plane Instruments

Cluster Dynamical Evolution

PROPERTIES AND MODELS OF THE INTRACLUSTER GAS

X-Ray Properties of Clusters

A Description of the X-Ray Gas Distribution

CLUSTERS WITH LARGE X-RAY CORE RADII - nXD CLUSTERS

Irregular, Cool X-Ray Clusters

X-Ray Double Clusters - A Possible Intermediate

Relaxed nXD Clusters

CLUSTERS WITH DOMINANT, CENTRAL GALAXIES - XD CLUSTERS

Cluster Dynamical Evolution and the Growth of cD Galaxies

Virgo - An Unevolved Cluster with a Dominant Galaxy

Spiral-Rich Clusters with cD Galaxies

Spiral-Poor Clusters with cD Galaxies

The Perseus Cluster

Groups of Galaxies

CLUSTER CLASSIFICATION

Correlations of Cluster Properties

The Dynamical Stages of Clusters

THE VIRIAL MASS DISTRIBUTION

X-RAY EMISSION FROM DISTANT CLUSTERS

EPILOGUE

REFERENCES