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Article Contents

ABSTRACT

1.INTRODUCTION

2.X-RAY TELESCOPES

2.1.ROSAT

2.2.ASCA

3.PROPERTIES OF THE INTRAGROUP MEDIUM

3.1.First ROSAT Results

3.2.ROSAT Surveys of Groups

3.3.Spatial Properties of the Intragroup Medium

3.4.Spectral Properties

4.CORRELATIONS

4.1.T- Relation

4.2.L_X- and L_X-T Relations

4.3.Galaxy Richness and Optical Luminosity

4.4.Morphological Content

5.COSMOLOGICAL IMPLICATIONS OF X-RAY GROUPS

5.1.The Physical Nature of Groups

5.2.Mass Estimates

5.3.Baryon Fraction

5.4.Large-Scale Structure

5.5.Moderate Redshift Groups

5.6.Gravitational Lensing

5.7.Cooling Flows

5.8.Fossil Groups

5.9.The Origin and Evolution of the Intragroup Medium

5.10.The Local Group

6.FUTURE WORK

REFERENCES