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Article Contents

ABSTRACT

1.INTRODUCTION: ARE ALL AGNS BORN EQUAL? - THE ROLE OF DUST IN THE UNIFIED SCHEMES OF AGNs

2.EXTINCTION - A POWERFUL DISCRIMINATOR OF DUST SIZE

2.1.Interstellar Extinction: Milky Way, SMC, and LMC

2.2AGN Extinction - "Gray" or SMC-like Extinction?

3.DUST SPECTROSCOPY - DIAGNOSIS OF DUST COMPOSITION

3.1.The 2175 Å Extinction Bump

3.2.The 3.4 µm Aliphatic Hydrocarbon Absorption Feature

3.3.The 9.7 µm and 18 µm Silicate Absorption and Emission Features

3.4.The 3.3, 6.2, 7.7, 8.6 and 11.3 µm PAH Emission Features

3.5.The Ice Absorption Features

4.IR EMISSION MODELING - INFERRING DUST SIZE AND TORUS GEOMETRY?

REFERENCES