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NGC 6745

NGC 6745
不规则星系NGC 6745A和NGC 6745B(右下)
观测资料(J2000 历元
星座天琴座
赤经19h 01m 41.7s[1]
赤纬+40° 45′ 11″[1]
红移4545 ± 60 km/s[1]
距离206 Mly [2]
视星等 (V)13.3[1]
特征
类型S?[1]
角直径 (V)1′.4[1]
其他名称
UGC 11391,[1] PGC 62691,[1]
Bird's Head,[3] NGC 6745a / 6745b / 6745c[3]
参见:星系星系列表

NGC 6745,即UGC 11391,是一个距离地球约2.06亿光年(6350万秒差距)的不规则星系,在天球上位于天琴座。该星系实际上是碰撞中的三个星系。

概要

该系统中的三个星系在数亿年前相碰撞。在经过较大的星系NGC 6745A之后,较小的星系NGC 6745B与A的距离正在拉长。较大的星系可能在碰撞前可能是螺旋星系,但在碰撞后结构被破坏,现在外观看起来是特殊星系。由于恒星之间距离相当遥远,两星系互相碰撞时恒星不可能直接相撞。然而,两星系内部的气体、尘埃与磁场将在碰撞时直接交互作用。交互作用的结果可能是较小的星系将大量星际物质流入较大的星系中。

参见

参考资料

  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 NASA/IPAC Extragalactic Database. Results for NGC 6745. [2006-11-25]. (原始内容存档于2011-05-14). 
  2. ^ A Bird's Eye View of a Galaxy Collision - Fast Facts. [2008-02-26]. (原始内容存档于2016-07-08). 
  3. ^ 3.0 3.1 de Grijs, R.; Anders, P.; Bastian, N.; Lynds, R.; et al. Star cluster formation and evolution in nearby starburst galaxies - II. Initial conditions. Monthly Notices of the Royal Astronomical Society. 2003, 343 (4): 1285–1300. Bibcode:2003MNRAS.343.1285D. arXiv:astro-ph/0305184可免费查阅. doi:10.1046/j.1365-8711.2003.06777.x. 

外部链接

维基共享资源上的相关多媒体资源:NGC 6745

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NGC 6745
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