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Article Contents

ABSTRACT

1.INTRODUCTION

1.1.Historical note

1.2.Distance

1.3.Systemic velocity

1.4.Environment

2.THE RADIO SOURCE AND ASSOCIATED FEATURES

2.1.Overview

2.2.The outer and middle lobes

2.3.The inner lobes and outer jet

2.4.Inner jet structure

2.5.Optical jet features

3.THE GALAXY

3.1.Overview

3.2.Globular clusters and metallicity

3.3.Late-type objects

3.4.Colours and reddening

4.THE DUSTY DISK

4.1.Overview

4.2.Atomic and molecular gas

4.3.Dust emission

4.4.Polarization and extinction

5.THE CENTRAL REGION

5.1.Overview

5.2.The circumnuclear disk

5.3.Nuclear emission at infrared wavelengths

5.4.The radio nucleus and nuclear jet

5.5.X- and -ray emission from the nuclear region

5.6.Variability of the nucleus

6.KINEMATICS AND DYNAMICS

6.1.Kinematical studies

6.2.Dynamical models

6.3.Evolutionary timescale

7.THE NUCLEAR ABSORPTION SPECTRUM

8.CONCLUDING SUMMARY

REFERENCES