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Article Contents

ABSTRACT

1.INTRODUCTION

1.1.A Short History of AGN Search Techniques

2.AGN SPECTRAL ENERGY DISTRIBUTION AND HOW ONE FINDS AGN

2.1.Optical Color Selection and the Presence of a Semi-stellar Nucleus

2.2.Optical Emission Lines, Variability, and Zero Proper Motion Selection

2.3.Radio Selection

2.4.Infrared Selection

2.5.High-Energy Selection

2.6.Ultraviolet Selection

3.SELECTION EFFECTS

4.X-RAY SELECTION OF AGN

4.1.Early X-ray Surveys

4.2.Soft X-ray Surveys

4.3.Pre-Chandra and XMM-Newton Hard X-ray Surveys

4.4.Deep Chandra and XMM-Newton Hard X-ray Surveys

4.5.Comparison of X-ray and Optical Surveys

4.6.Very High Energies

5.CONCLUSIONS

REFERENCES