Annu. Rev. Astron. Astrophys. 1982. 20: 431-468 Copyright © 1982 by Annual Reviews. All rights reserved

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

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Table of Contents

• INTRODUCTION
• What is an Active Galaxy?
• The Scope of the Review
• THE INFLUENCE OF THE EXTRAGALACTIC ENVIRONMENT
• Cluster Environment
• Near-Neighbors and Interacting Systems
• ACTIVITY AND THE STELLAR PROPERTIES OF GALAXIES
• Morphological Types
• Stellar Kinematics
• Absolute Magnitude
• Bars, Rings, and Disk Anomalies
• Stellar Populations and Birthrates
• GAS AND DUST IN ACTIVE GALAXIES
• Dust
• Neutral and Molecular Gas
• Extranuclear Ionized Gas
• COSMOLOGICAL EVOLUTION OF ACTIVE NUCLEI
• PERSPECTIVES
• Summary
• The Importance of Fluids: Radial Motions
• Causes of Activity
• Concluding Remarks
• REFERENCES