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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