The Polar-Ring Galaxies NGC 2685 and NGC 3808B (W 300)

International Astronomical Union Colloquium ◽

10.1017/s0252921100005157 ◽

1990 ◽

Vol 124 ◽

pp. 231-244

Author(s):

V. P. Reshetnikov ◽

V. A. Yakovleva

Keyword(s):

Intergalactic Medium ◽

Close Encounter ◽

Main Body ◽

Polar Plane ◽

Polar Ring ◽

Ring Galaxies ◽

Companion Galaxy ◽

Peculiar Galaxies

Polar-ring galaxies (PRG) are among the most interesting examples of interaction between galaxies. A PRG is a galaxy with an elongated main body surrounded by a ring (or a disk) of stars, gas, and dust rotating in a near-polar plane (Schweizer, Whitmore, and Rubin, 1983). Accretion of matter by a massive lenticular galaxy from either intergalactic medium or a companion galaxy is usually considered as an explanation of the observed structure of PRG. In the latter case there are two possibilities: (1) capture and merging of a neighbor galaxy, and (2) accretion of mass from a companion galaxy during a close encounter. Two PRG formation scenarios just mentioned are illustrated here by the results of our observations of the peculiar galaxies NGC 2685 and NGC 3808B.

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2-D spectroscopy of polar-ring galaxies candidates. II. The peculiar galaxies NGC 2748 and UGC 4385

Astronomy Letters ◽

10.1134/s1063773709090023 ◽

2009 ◽

Vol 35 (9) ◽

pp. 587-598 ◽

Cited By ~ 1

Author(s):

O. A. Merkulova ◽

L. V. Shalyapina ◽

V. A. Yakovleva

Keyword(s):

Polar Ring ◽

Ring Galaxies ◽

Peculiar Galaxies

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Polar Ring Galaxies and the Tully-Fisher relation: implications for the dark halo shape

Symposium - International Astronomical Union ◽

10.1017/s007418090018372x ◽

2004 ◽

Vol 220 ◽

pp. 405-410

Author(s):

Magda Arnaboldi ◽

Enrica Iodice ◽

Frederick Bournaud ◽

Francoise Combes ◽

Linda S. Sparke ◽

...

Keyword(s):

Near Infrared ◽

Host Galaxy ◽

Dark Halo ◽

Line Flux ◽

Polar Plane ◽

Polar Ring ◽

Ring Galaxies ◽

Fisher Relation ◽

Larger Sample ◽

K Band

We have investigated the Tully-Fisher relation for Polar Ring Galaxies (PRGs), based on near infrared, optical and Hi data available for a sample of these peculiar objects. The total K-band luminosity, which mainly comes from the central host galaxy, and the measured Hi linewidth at 20% of the peak line flux density, which traces the potential in the polar plane, place most polar rings of the sample far from the Tully-Fisher relation defined for spiral galaxies, with many PRGs showing larger Hi line-widths than expected for the observed K band luminosity. This result is confirmed by a larger sample of objects, based on B-band data. This observational evidence may be related to the dark halo shape and orientation in these systems, which we study by numerical modeling of PRG formation and dynamics: the larger rotation velocities observed in PRGs can be explained by a flattened polar halo, aligned with the polar ring.

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