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Article Contents

ABSTRACT

1.INTRODUCTION

2.BASIC INFERENCES ABOUT THE LINE-EMITTING GAS

3.BROAD EMISSION-LINE VARIABILITY AND THEORY OF REVERBERATION MAPPING

3.1.Basic Assumptions

3.2.Isodelay Surfaces

3.3.Velocity-Delay Maps

4.REVERBERATION RESULTS

4.1.Size of the BLR and Scaling with Luminosity

4.2.Reverberation and AGN Black Hole Masses

5.WHAT IS THE BLR?

5.1."Cloud" Models

5.2. "Bloated Stars" Model

5.3.Double-Peaked Emission Lines

5.4.Disk Winds

6.WHAT WILL IT TAKE TO MAP THE BROAD-LINE REGION?

7.SOME OBVIOUS QUESTIONS TO KEEP IN MIND

8.SUMMARY

REFERENCES