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Article Contents

ABSTRACT

1.INTRODUCTION

1.1.The Stability of Polar Orbits

1.2.The Shape of the Dark Halo

1.3.The Merger Rate

1.4.Insight into How Other Galaxies Formed

2.THE POLAR RING CATALOG

2.1.Category A - Kinematically Confirmed

2.2.Category B - Good Candidates

2.3.Category C - Possible Candidates

2.4.Category D - Systems Possibly Related to Polar-Ring Galaxies

3.A FEW STATISTICS FROM THE POLAR RING CATALOG

3.1.Morphological Type of the Central Component

3.2.Narrow Ring or Wide Annulus?

3.3.The Angle Between the Ring and the Disk

3.4.Are the Polar Rings Warped or Straight?

3.5.Ring Symmetry and the Presence of Outer Debris

4.FUTURE WORK

REFERENCES