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Article Contents

ABSTRACT

1.INTRODUCTION

2.EXTENDED SOURCES: THEORETICAL INTERPRETATION

2.1.General observational constraints on models

2.2.Outline of the "beam "model

2.3.Interactions with the extragalactic medium

2.4."Jets"

2.5.Radio trails

2.6.Collimation

3.COMPACT RADIO COMPONENTS

3.1.Angular size constraints

3.2.Radiative transfer

3.3.Kinematics of superluminal expansion

3.4.Dynamical considerations

3.5.Some observational tests

REFERENCES