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AM 0644-741 - 版本历史
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<p><b>新页面</b></p><div>{{Infobox Galaxy<br />
| image = [[Image:AM 0644-741.jpg|250px]]<br />
| caption = [[哈伯太空望遠鏡]]拍攝的AM 0644-741。來自：[[NASA]]/[[歐洲太空總署]]<br />
| name = AM 0644-741<br />
| type = (S0-) + 環<ref name="ned">{{cite web<br />
| title=Nasa/Ipac Extragalactic Database<br />
| work=Results for AM 0644-741<br />
| url=http://nedwww.ipac.caltech.edu/<br />
| accessdate=2006-10-12<br />
| archive-date=2011-08-11<br />
| archive-url=https://www.webcitation.org/60r7f2bOq?url=http://ned.ipac.caltech.edu/<br />
| dead-url=no<br />
}}</ref><br />
| epoch = [[J2000]]<br />
| ra = {{RA|6|43|6.1}}<ref name="ned" /><br />
| dec = {{DEC|-74|13|35}}<ref name="ned" /><br />
| dist_ly = 3億 [[光年]]<br />
| z = 6604 ± 26 km/[[秒|s]]<ref name="ned" /><br />
| appmag_v = +13.96<ref name="ned" /><br />
| size_v = 1′.7<ref name="ned" /><br />
| constellation name = [[飛魚座]]<br />
| names = 南方橢圓（Southern Ellipse）<ref name="ned" />、 PGC 19481、AM 0644-741、ESO 34-11、VV 785、IRAS 06443-7411、SGC 064425-7411.1<br />
}}<br />
<br />
'''AM 0644-741'''是[[無棒透鏡星系]]和[[環星系]]的組合，位於南天[[飛魚座]]的方向，距離地球3億光年。淡黃的核曾經是一個正常的螺旋星系的中心，環繞著中心的環[[直徑]]是150,000[[光年]]<ref>{{cite web |title=Ring Galaxy AM 0644-741 from Hubble |url=http://apod.nasa.gov/apod/ap150419.html |publisher=[[Astronomy Picture of the Day]] |date=April 19, 2015 |accessdate=2016-07-27 |archive-date=2016-08-08 |archive-url=https://web.archive.org/web/20160808045608/http://apod.nasa.gov/apod/ap150419.html |dead-url=no }}</ref>。理論上，環是星系形成之後與另一個星系交互作用，觸發了[[引力]]的擾動，使灰塵凝結導致恆星的形成，並迫使它們離開星系成為環狀。這個環是年輕、大質量、高溫的藍色恆星猖獗形成的區域。沿著環的粉紅色區域是受到來自炙熱藍色恆星的強烈紫外線照射，發出螢光的稀薄氫氣體雲層。星系模擬的模型顯示AM 0644-741的環還會繼續擴大，而大約在3億年後就會開始瓦解<ref name=Hubble>{{Cite web|url=http://hubblesite.org/newscenter/archive/releases/2004/15/|work=News Release Number: STScI-2004-15|publisher=[[HubbleSite]]|title=The Lure of the Rings|date=April 22, 2004|accessdate=March 31, 2012|archive-date=2016-09-07|archive-url=https://web.archive.org/web/20160907063010/http://hubblesite.org/newscenter/archive/releases/2004/15/|dead-url=no}}</ref>。<br />
<br />
== 參考資料 ==<br />
{{reflist}}<br />
<br />
[[Category:環星系]]<br />
[[Category:無棒透鏡星系]]<br />
[[Category:飛魚座]]<br />
[[Category:PGC天體|019481]]<br />
[[Category:ESO 天體|34-11]]<br />
[[Category:IRAS 目錄天體|06443-7411]]</div>
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