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Article Contents

ABSTRACT

1.INTRODUCTION

2.OBSERVATIONS OF GIANT LYα NEBULAE

2.1.Quasar Lyα Nebulae

2.1.1.Rise of the Giants

2.2.Radio-galaxy Lyα Halos

2.3.Lyα blobs

3.ORIGIN OF THE EMISSION

3.1.Recombination radiation

3.2.Continuum pumping (scattering)

3.3.Collisional Excitation (cooling)

4.ORIGIN OF THE EMITTING GAS, KINEMATICS AND GAS FLOWS

5.SUMMARY

REFERENCES