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Article Contents

ABSTRACT

1.INTRODUCTION

2.WHAT SUPPLIES THE INFALLING GAS?

2.1.General Infall from the Galaxy

2.2.Stellar Disruption

3.MODES OF ACCRETION

3.1.Disc Accretion

3.2.Dissipative Quasi-Spherical Accretion

4.THE CONTINUUM RADIATION

4.1.Processes Involving Synchrotron-Type Emission from Relativistic Particles

4.2.Other Plasma-Type Processes

5.THE SIZES OF THE EMITTING REGIONS

6.THE EVOLUTIONARY CONTEXT: "DEAD" QUASARS

7.CONCLUSION

REFERENCES