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Article Contents

ABSTRACT

1.INTRODUCTION

2.THE GALACTIC HALO

2.1.Neutral Hydrogen Halo Gas

2.2.Warm Ionized and Warm-Hot Halo Gas

2.3.Hot Halo Gas

2.4.Dust, Metals and Molecules

2.5.The Disk-Halo Interface

3.HALOS OF OTHER SPIRAL GALAXIES

3.1.Neutral Hydrogen Halo Gas

3.2.Warm Ionized and Warm-Hot Halo Gas

3.3.Hot Halo Gas

3.4.Dust, Metals and Molecules

4.ORIGINS

4.1.Accretion from the IGM

4.2.Feedback

4.3.Satellite Accretion

5.HALO CLOUD SURVIVAL

6.FEEDING GALAXY DISKS

6.1.Halo Sources

6.2.Disk-Halo Interface

6.3.Disk Sources

7.FUTURE DIRECTIONS

REFERENCES