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Article Contents

ABSTRACT

1.INTRODUCTION

2.PHYSICAL PROPERTIES OF THE WHIM

2.1.WHIM ionisation conditions

2.2.WHIM absorption signatures in the UV and X-ray band

2.3.The baryon content of the WHIM as measured by UV and X-ray absorbers

3.UV MEASUREMENTS OF THE WHIM

3.1.Past and present UV instruments

3.2.Intervening WHIM absorbers at low redshift

3.3.The Milky Way halo and Local Group gas

4.X-RAY MEASUREMENTS OF THE WHIM

4.1.Past and present X-ray instruments

4.2.Intervening WHIM absorbers at low redshift

4.3.The Milky Way halo and Local Group gas

5.ADDITIONAL ASPECTS

5.1.Results from numerical simulations

5.2.WHIM absorbers at high redshift

5.3.Concluding remarks

REFERENCES