Polar-ring galaxy - Revision history

wikademia>Wikademia at 00:31, 11 April 2009

2009-04-11T00:31:00Z

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	The first four galaxies that were identified as polar-ring galaxies were NGC 2685, While these galaxies have been extensively studied, many other polar-ring galaxies have since been identified.		The first four galaxies that were identified as polar-ring galaxies were NGC 2685, While these galaxies have been extensively studied, many other polar-ring galaxies have since been identified.

	~~==References==~~

	~~<div class="references-small"><references/></div>~~

	==External links==		==External links==

	* [http://antwrp.gsfc.nasa.gov/apod/ap990510.html APOD: May 10, 1999 - Polar Ring Galaxy NGC 4650A]		* [http://antwrp.gsfc.nasa.gov/apod/ap990510.html APOD: May 10, 1999 - Polar Ring Galaxy NGC 4650A]
	* [http://hubblesite.org/newscenter/archive/releases/1999/16/ Internet Voters Get Two Galaxies in One from Hubble]		* [http://hubblesite.org/newscenter/archive/releases/1999/16/ Internet Voters Get Two Galaxies in One from Hubble]
	* [http://space.newscientist.com/article/mg19726455.500-x-marks-the-spot-in-dark-matter-web.html?feedId=online-news_rss20 X marks the spot in dark matter web] - Polar ring galaxies offer first-hand evidence of the existence of the cosmic web, ''New Scientist'', 29 February 2008		* [http://space.newscientist.com/article/mg19726455.500-x-marks-the-spot-in-dark-matter-web.html?feedId=online-news_rss20 X marks the spot in dark matter web] - Polar ring galaxies offer first-hand evidence of the existence of the cosmic web, ''New Scientist'', 29 February 2008

	~~==See also==~~
	* [[List of polar-ring galaxies]]

	[[Category:Galaxy morphological types]]		[[Category:Galaxy morphological types]]
	[[Category:Polar-ring galaxies\| ]]		[[Category:Polar-ring galaxies\| ]]
	{{ntnes}}		{{ntnes}}

wikademia>Wikademia at 00:30, 11 April 2009

2009-04-11T00:30:27Z

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-[[Image:NGC 4650A I HST2002.jpg|right|thumb|140px|[[NGC 4650A]], an example of a polar-ring galaxy.  Credit:[[Hubble Space Telescope]]/[[NASA]]/[[ESA]].]]
+[[Image:NGC 4650A I HST2002.jpg|right|thumb|140px|NGC 4650A, an example of a 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.<ref name="binneymerrifield1998">{{cite book
+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 first four galaxies that were identified as polar-ring galaxies were [[NGC 2685]],<ref name="schectergunn1978">{{cite journal
+The first four galaxies that were identified as polar-ring galaxies were NGC 2685, While these galaxies have been extensively studied, many other polar-ring galaxies have since been identified.
 ==References==

wikademia>Wikademia at 00:16, 11 April 2009

2009-04-11T00:16:49Z

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	[[Category:Galaxy morphological types]]		[[Category:Galaxy morphological types]]
	[[Category:Polar-ring galaxies\| ]]		[[Category:Polar-ring galaxies\| ]]
			{{ntnes}}
	~~[[de:Polarring-Galaxie]]~~
	~~[[fr:Galaxie à anneau polaire]]~~
	~~[[it:Galassia ad anello polare]]~~
	~~[[zh:極環星系]]~~

wikademia>Wikademia: 59 revisions

2009-04-04T05:18:43Z

59 revisions

← Older revision	Revision as of 05:18, 4 April 2009
(No difference)

86.212.252.70: + (fr:)

2009-02-07T21:27:14Z

+ (fr:)

← Older revision		Revision as of 21:27, 7 February 2009
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	[[de:Polarring-Galaxie]]		[[de:Polarring-Galaxie]]
			[[fr:Galaxie à anneau polaire]]
	[[it:Galassia ad anello polare]]		[[it:Galassia ad anello polare]]
	[[zh:極環星系]]		[[zh:極環星系]]

91.198.174.201: Citation maintenance. Removed redundant parameters. You can use this bot yourself! Please report any bugs.

2008-12-14T20:44:41Z

Citation maintenance. Removed redundant parameters. You can use this bot yourself! Please report any bugs.

← Older revision		Revision as of 20:44, 14 December 2008
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	\| publisher=Princeton University Press		\| publisher=Princeton University Press
	\| location=Princeton, New Jersey		\| location=Princeton, New Jersey
	\| id=~~ISBN~~ 0-691-00402-1}}</ref> These polar rings are thought to form when two galaxies [[interacting galaxy\|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.<ref name="schweizeretal1983">{{cite journal		\| isbn=0-691-00402-1}}</ref> These polar rings are thought to form when two galaxies [[interacting galaxy\|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.<ref name="schweizeretal1983">{{cite journal
	\| author=F. Schweizer, B. C. Whitmore, V. C. Rubin		\| author=F. Schweizer, B. C. Whitmore, V. C. Rubin
	\| title=Colliding and merging galaxies. II - S0 galaxies with polar rings		\| title=Colliding and merging galaxies. II - S0 galaxies with polar rings

wikademia>凌雲 at 15:45, 7 July 2008

2008-07-07T15:45:44Z

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	[[de:Polarring-Galaxie]]		[[de:Polarring-Galaxie]]
	[[it:Galassia ad anello polare]]		[[it:Galassia ad anello polare]]
			[[zh:極環星系]]

70.55.84.69: /* External links */

2008-07-03T06:07:34Z

External links

← Older revision		Revision as of 06:07, 3 July 2008
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	* [http://hubblesite.org/newscenter/archive/releases/1999/16/ Internet Voters Get Two Galaxies in One from Hubble]		* [http://hubblesite.org/newscenter/archive/releases/1999/16/ Internet Voters Get Two Galaxies in One from Hubble]
	* [http://space.newscientist.com/article/mg19726455.500-x-marks-the-spot-in-dark-matter-web.html?feedId=online-news_rss20 X marks the spot in dark matter web] - Polar ring galaxies offer first-hand evidence of the existence of the cosmic web, ''New Scientist'', 29 February 2008		* [http://space.newscientist.com/article/mg19726455.500-x-marks-the-spot-in-dark-matter-web.html?feedId=online-news_rss20 X marks the spot in dark matter web] - Polar ring galaxies offer first-hand evidence of the existence of the cosmic web, ''New Scientist'', 29 February 2008

			==See also==
			* [[List of polar-ring galaxies]]

	[[Category:Galaxy morphological types]]		[[Category:Galaxy morphological types]]

70.55.84.69 at 06:00, 3 July 2008

2008-07-03T06:00:11Z

← Older revision		Revision as of 06:00, 3 July 2008
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	[[Category:Galaxy morphological types]]		[[Category:Galaxy morphological types]]
			[[Category:Polar-ring galaxies\| ]]

	[[de:Polarring-Galaxie]]		[[de:Polarring-Galaxie]]
	[[it:Galassia ad anello polare]]		[[it:Galassia ad anello polare]]

wikademia>Roberto Mura: /* External links */

2008-06-22T11:39:59Z

External links

← Older revision		Revision as of 11:39, 22 June 2008
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	[[de:Polarring-Galaxie]]		[[de:Polarring-Galaxie]]
			[[it:Galassia ad anello polare]]