Annu. Rev. Astron. Astrophys. 1992. 30: 51-74 Copyright © 1992 by . All rights reserved

Reprinted with kind permission from , 4139 El Camino Way, Palo Alto, California, USA

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KEY WORDS: galaxies, dynamics, galaxy formation, cosmology

Table of Contents

THE OBSERVATIONAL SITUATION

NAIVE THEORY

WAVES AND MODES IN DISKS

Discrete Modes

Continuum Modes and the Initial-Value Problem

THE HALO'S RESPONSE AND DISSIPATION

THE HALO TAKES THE INITIATIVE

WARPS AND GALAXY FORMATION

WARPS AND INFALL

TIDALLY GENERATED WARPS

CONCLUSIONS

REFERENCES