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Article Contents

ABSTRACT

1.INTRODUCTION

2.JET THEORY

2.1.The Standard Model

2.2.Simulations

3.THE JETS IN CYGNUS A FROM PC- TO KPC-SCALES

3.1.Images: Bends and Knots

3.2.Opening Angle, Stability, and Confinement

3.3.Velocity and Composition

4.THE HOTSPOTS

4.1.The Dentist's Drill

5.THE RADIO LOBES

5.1.The Bridge and Plumes

5.2.The Filaments

6.RADIO CONTINUUM SPECTROSCOPY

6.1.Synchrotron Spectral Ageing

6.2.The Hotspot Spectra

6.3.Lobe Spectra and the Age of the Radio Source

6.4.An Alternative: The Universal Spectrum

7.MAGNETIC FIELDS

7.1.Minimum Energy

7.2.Fractional Polarization and Projected Field Morphology

7.3.The Faraday Screen: Magnetic Fields in Cluster Gas

8.THE X-RAY CLUSTER

8.1.Large Scale Gas Distribution

8.2.The Second Dynamical Component

8.3.Pressure Balance

8.4.X-Ray Hotspots

9.THE CYGNUS A GALAXY

9.1.Classification and Cluster Membership

9.2.Optical Emission Components

9.3.Infrared, Submm, and MM Emission

9.4.A Merger Origin for the Cygnus A Galaxy?

9.5.A Cooling Flow Origin for the Cygnus A Activity?

10.THE NUCLEAR REGIONS OF THE CYGNUS A GALAXY

11.AN OBSCURED QSO IN CYGNUS A?

12.THE SYMMETRIC TWIN RELATIVISTIC JET MODEL APPLIED TO CYGNUS A

13.THE CENTRAL ENGINE

13.1.Some Theories

13.2.Some Observations: Variability, Small-Scale Structure

14.IS CYGNUS A REPRESENTATIVE OF z ~ 1 GALAXIES?

REFERENCES