ARlogo Annu. Rev. Astron. Astrophys. 1985. 23: 147-168
Copyright © 1985 by Annual Reviews. All rights reserved

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

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SHELLS AND RINGS AROUND GALAXIES

E. Athanassoula and A. Bosma


Observatoire de Marseille, 2 Place Le Verrier, 13248 Marseille Cedex 04, France


Table of Contents

INTRODUCTION

RING GALAXIES

OUTER RINGS AROUND SPIRALS AND S0s

POLAR RING GALAXIES
Observational Properties
Theoretical Considerations
Gas Around S0s

SHELLS AROUND ELLIPTICAL GALAXIES
Shells, and Ripples
Theories of Shell Formation
The Problem of Dust and Gas

FINAL REMARKS

REFERENCES

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