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Article Contents

ABSTRACT

1.INTRODUCTION

1.1.A little bit of history; how magnetic fields have been measured

1.2.The extent and implications of extragalactic magnetic fields

2.LARGE SCALE MAGNETIC FIELDS IN COSMOLOGICALLY NEARBY GALAXIES

2.1.Introduction

2.2.Observational overview of large scale magnetic fields in spiral galaxies

2.3.The physics of magnetic field amplification and evolution in spiral galaxies

2.4.How well does the galactic dynamo theory conform to the observations?

2.5.Where, and to what extent could magnetic forces compete with gravity in galaxy systems?

3.MAGNETIC FIELD OUTFLOW INTO THE ICM FROM GALAXY-GENERATED ACTIVITY

3.1.Evidence for the magnetic `seeding` of the intergalactic medium due to normal' activity of nearby galaxies

3.2.Injection of magnetic fields into the intergalactic medium by extragalactic radio source jets and lobes

4.MAGNETIC FIELDS ASSOCIATED WITH CLUSTERS OF GALAXIES

4.1.Faraday rotation and x-ray probes of galaxy cluster magnetic fields

4.2.Regeneration and amplification of magnetic fields in the intercluster medium

4.3.Low frequency radio emission as a tracer of extragalactic magnetic fields

5.THE DETECTION OF GALACTIC AND EXTRAGALACTIC MAGNETIC FIELDS AT EARLIER COSMOLOGICAL EPOCHS

5.1Searches for a magnetic field in the widespread intergalactic medium up to the redshifts of quasars

5.2.Magnetic fields associated with absorption line system in quasars

5.3.Probes of cosmological magnetic field evolution using quasar Faraday rotation statistics

5.4.Indirect indicators of extragalactic magnetic fields

5.5.Seed field before the galaxy formation epoch

6.COSMOLOGICAL SEED FIELDS, OR GALAXY-GENERATED SEED FIELDS, OR BOTH?

7.CONCLUDING REMARKS

REFERENCES