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Article Contents

ABSTRACT

1.INTRODUCTION

2.HI IN GALAXIES AND THE DARK MATTER PROBLEM: EARLY WORK

3.WARPS

4.FURTHER DATA ON HI IN GALAXIES AND THE DARK MATTER PROBLEM

5.THE DISK-HALO DEGENERACY IN THE DARK MATTER PROBLEM

6.FLARING OF THE OUTER HI LAYER: PROBING THE SHAPE OF THE DARK MATTER HALO

6.1.Early Work on Case Studies

6.2.Recent Results for Small, Flat Galaxies

6.3.Large Galaxies with a High Star Formation Rate: Accretion

6.4.Velocity Dispersions in the Outer HI Layers of Spiral Galaxies

6.5.Star Formation in Warped HI Layers

7.THE CORE-CUSP PROBLEM

8.ALTERNATIVE GRAVITY THEORIES

9.IRREGULAR GALAXIES

9.1.Very Large HI Envelopes

9.2.Velocity Dispersions in Dwarf Irregular Galaxies

10.THE RELATION BETWEEN HI EXTENT AND THE OPTICAL RADIUS

11.CONCLUDING REMARKS

REFERENCES