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Abstract 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