List Of Polar-ring Galaxies
The following table lists polar-ring galaxies: List Inner Polar Rings Some galaxies feature a "polar ring" within the disk of the galaxy * UGC 5600Astronomy Letters, Volume 27, Number 2, February 2001, pp. 74-80(7) A photometric study of the polar ring galaxy UGC 5600 See also * Lists of astronomical objects * List of galaxies The following is a list of notable galaxies. There are about 51 galaxies in the Local Group (see list of nearest galaxies for a complete list), on the order of 100,000 in the Local Supercluster, and an estimated 100 billion in all of the ob ... References {{DEFAULTSORT:Polar-ring galaxies Polar-ring * ...
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Polar-ring Galaxy
A polar-ring galaxy is a type of galaxy in which an outer ring of gas and stars rotates over the poles of the galaxy. These polar rings are thought to form when two galaxies gravitationally interact with each other. One possibility is that a material is tidally stripped from a passing galaxy to produce the polar ring seen in the polar-ring galaxy. The other possibility is that a smaller galaxy collides orthogonally with the plane of rotation of the larger galaxy, with the smaller galaxy effectively forming the polar-ring structure. The best-known polar-ring galaxies are S0s (lenticular galaxies), but from the physical point of view they are part of a wider category of galaxies, including several ellipticals. The first four S0 galaxies that were identified as polar-ring galaxies were NGC 2685, NGC 4650A, A 0136 -0801, and ESO 415 -G26. While these galaxies have been extensively studied, many other polar-ring galaxies have since been identified. Polar-ring S0 galaxies may ...
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