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Article Contents

ABSTRACT

1.INTRODUCTION

2.X-RAY ABSORPTION AS A DIAGNOSTIC OF THE TORUS

2.1.The Distribution of N_H

2.2.X-ray Absorption as a Probe of the Parsec Scale Torus

2.3.X-ray Absorption as a Probe of the 100 pc Scale Torus

2.4.Intermediate Type Seyferts

2.5.Dual Absorbers

3.X-RAY ABSORPTION AND GALAXY MORPHOLOGY

4.THE RELATION BETWEEN OPTICAL AND X-RAY ABSORPTION

5.PIERCING COMPLETELY HIDDEN AGNs

6.FOSSIL ACTIVE NUCLEI

7.IMPLICATIONS FOR THE X-RAY BACKGROUND

REFERENCES