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Article Contents

TITLE PAGE

1.INTRODUCTION

1.1.What is an Active Galaxy?

1.2.The Scope of the Review

2.THE INFLUENCE OF THE EXTRAGALACTIC ENVIRONMENT

2.1.Cluster Environment

2.2.Near-Neighbors and Interacting Systems

3.ACTIVITY AND THE STELLAR PROPERTIES OF GALAXIES

3.1.Morphological Types

3.2.Stellar Kinematics

3.3.Absolute Magnitude

3.4.Bars, Rings, and Disk Anomalies

3.5.Stellar Populations and Birthrates

4.GAS AND DUST IN ACTIVE GALAXIES

4.1.Dust

4.2.Neutral and Molecular Gas

4.3.Extranuclear Ionized Gas

5.COSMOLOGICAL EVOLUTION OF ACTIVE NUCLEI

6.PERSPECTIVES

6.1.Summary

6.2.The Importance of Fluids: Radial Motions

6.3.Causes of Activity

6.4.Concluding Remarks

REFERENCES