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NGC 4449

NGC 4449
哈伯太空望远镜 (HST)的NGC 4449影像。
观测资料(J2000 历元
星座猎犬座[1]
赤经12h 28m 11.9s[2]
赤纬+44° 05′ 40″[2]
红移207 ± 4 公里/秒[2]
距离~1200万光年 (~ 360万秒差距)[2]
视星等 (V)10.0[2]
特征
类型IBm[2]
角直径 (V)6′.2 × 4′.4 [2]
其他名称
UGC 7592,[2] PGC 40973,[2] 科德韦尔21
参见:星系星系列表

NGC 4449,也称为科德韦尔21,是位于猎犬座的一个不规则星系,距离大球大约1,200万光年,属于M94星系团 (猎犬座星系群) 的一部分。这是相对来说相当靠近本星系群,我们银河系系所属的星系群,的一个星系群。由于和大麦哲伦星系 (LMC) 的大小非常相似,因此被仔细的研究和拿来做为比较。NGC 4449有一般的棒型,也有LMC的特征,散布着蓝色的恒星和星团。靠近底部 (哈伯的照片) 是氢原子气体发出的粉红色光,这是大质量恒星形成区的泄踪剂。与邻近星系间的交互作用被认为对恒星的形成有所影响。

外部链接

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参考资料

[编辑]
  1. ^ R. W. Sinnott, editor. The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer. Sky Publishing Corporation and Cambridge University Press. 1988. ISBN 0-933346-51-4. 
  2. ^ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 NASA/IPAC Extragalactic Database. Results for NGC 4449. [2007-07-13]. (原始内容存档于2011-05-14). 
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NGC 4449
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