人馬座矮不規則星系

SagDIG. (依照NASA/ESA的慣例)
观测资料（J2000 曆元）
星座人馬座
赤经19h 29m 59.0s[1]
赤纬-17° 40′ 41″[1]
紅移-79 ± 1 公里/秒[1]
距离3.39 ± 0.23 Mly (1.04 ± 0.07 Mpc)[2][3]
视星等 (V)15.5[1]
特征
类型IB(s)m[1] V (矮不規則星系)
角直徑 (V)2′.9 × 2′.1[1]
其他名称
人馬座矮不規則星系[1]、 SGR矮星系[1]
、ESO594-G004[1]、 PGC 63287[1] Kowal's Object[1]
參見：星系、星系列表

人馬座矮不規則星系或SagDIG是一個位於人馬座的矮星系，距離大約340萬光年遠，重要的是不要和銀河系的衛星星系SagDEG (人馬座矮橢球星系)混淆了。這個星系是Cesarsky從歐洲南天天文台一米施密特攝星儀於1977年6月13日拍攝的ESO(B)攝影乾片內發現的[4]。

SagDIG是距離本星系群質量中心最遙遠的星系，他是少數在0速度面之外的星系[5]。

SagDIG比寶瓶座矮星系亮了許多的星系，並且長期以來都有恆星在形成 (Momany et al. 2005) ，這導致他富含有中等年齡的恆星。在SagDIG內有27顆碳星的候選者，分析顯示SagDIG是貧金屬的星族，([Fe/H] ≤ −1.3)。更進一步明說，恆星都是年輕的，恆星的年齡分布以4億至8億歲為主[6]。

參考資料

  1. ^ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 NASA/IPAC Extragalactic Database. Results for Sagittarius Dwarf Irregular. [2007-03-15]. （原始内容存档于2013-06-02）. 
  2. ^ I. D. Karachentsev, V. E. Karachentseva, W. K. Hutchmeier, D. I. Makarov. A Catalog of Neighboring Galaxies. Astronomical Journal. 2004, 127: 2031–2068 [2008-03-01]. （原始内容存档于2007-10-12）. 
  3. ^ Karachentsev, I. D.; Kashibadze, O. G. Masses of the local group and of the M81 group estimated from distortions in the local velocity field. Astrophysics. 2006, 49 (1): 3–18. 
  4. ^ ESO/M. Bellazzini; et al. A diamond in the rough. ESO. 2018-01-29 [2018-01-29]. （原始内容存档于2020-11-28）. 
  5. ^ van den Bergh, Sidney, Updated Information on the Local Group, The Publications of the Astronomical Society of the Pacific, April 2000, 112 (770): 529-536 [2008-04-20], （原始内容存档于2019-10-15） 
  6. ^ Gullieuszik, M.; Rejkuba, M.; Cioni, M. R.; Habing, H. J.; Held, E. V., Near-infrared photometry of carbon stars in the Sagittarius dwarf irregular galaxy and DDO 210, Astronomy and Astrophysics, November 2007, 475 (2): 467-477 

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