Published in "Astrophysical Jets", eds. D. Burgarella, M. Livio and C. P. O'Dea, 1993

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Abstract. We review the current observational status of the M87 jet at radio, optical, and X-ray frequencies. Special attention is paid to the radio morphology, the radio-to-X-ray spectrum, measurement of proper motions, and optical evidence for a counter-jet. The problem of jet confinement is discussed, as well as models for the radio-to-X-ray spectrum and the related problem of particle lifetimes. Finally a kinematic model is sketched wherein the first kpc of the jet is relativistic, followed by shocks and subrelativistic flow.

Table of Contents

INTRODUCTION

OBSERVATIONS AND SOME IMPLICATIONS

Radio Structure of the Jet

The Radio-to-X-Ray Spectrum of the Jet

Proper Motions in the Jet

Evidence for the Presence of a Counter-Jet

MODELS AND PROBLEMS

Confinement of the Jet

Models for the Radio-to-X-Ray Spectrum and the Particle Lifetime Problem

A Model for the Jet Kinematics

SUMMARY AND FUTURE WORK

REFERENCES