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Article Contents

TITLE PAGE

12.1.INTRODUCTION

12.1.1.The Role of Neutral Hydrogen in Galaxies

12.1.2.The Information in the 21-cm Line

12.1.3.Pictorial Presentation of HI Data

12.2.THE DISTRIBUTION OF HI IN GALAXIES

12.2.1.Morphology

12.2.2.Sizes

12.2.3.Warps

12.2.4.Appendages

12.3.VELOCITY FIELDS

12.3.1.Rotation Curves

12.3.2.Distortions in the Velocity Field

12.3.3.The Mass Distribution in Spiral Galaxies

12.3.4.Dark Matter in Dwarf Galaxies

12.4.THE VELOCITY WIDTH AS A DISTANCE INDICATOR

12.4.1.The Velocity Width-Magnitude Relation

12.4.2.Deviations from Hubble Flow

12.5.HI CONTENT AND OTHER GLOBAL PROPERTIES

12.5.1.Relations Between Global Properties for Spirals (Sa and Later)

12.5.2.Content of Early-Type Galaxies