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Article Contents

ABSTRACT

1.INTRODUCTION

2.DISCOVERY AND EARLY WORK

3.CONTINUUM EMISSION
3.1.Radio Emission
3.2.Millimetre and infrared emission
3.2.1.Variability of the millimetre-IR emission
3.3.The blue bump
3.3.1.The variability of the blue bump
3.4.X and gamma-ray emission
3.4.1.The soft excess
3.4.2.The medium energy component
3.4.3.The Fe line
3.4.4.The high energy component
3.4.5.X-ray variability
3.5.The Overall continuum spectral energy distribution

4.THE MULTI-WAVELENGTH APPROACH TO THE CONTINUUM EMISSION

5.LINE EMISSION
5.1.Line variability

6.THE JET
6.1.The radio-optical jet
6.2.The VLBI Jet

7.THE HOST GALAXY

8.UNDERSTANDING IT

REFERENCES