馬亞爾II

馬亞爾II
哈伯太空望遠鏡拍攝的馬亞爾II影像，色彩是由1994年7月分別以可見光和近紅外光拍攝的影像合成。
創建者：Michael Rich, Kenneth Mighell、James D. Neill（哥倫比亞大學）、Wendy Freedman（卡內基天文台）、和NASA。
觀測數據(J2000 曆元)
星座仙女座
赤經00h 32m 46.51s[1]
赤緯+39° 34′ 39.7″[1]
距離2.52 ± 0.14 Mly (770 ± 40 kpc)
視星等 (V)+13.8[1]
物理性質
Mass1×107[2] M☉ (2×1037 kg)
半徑21.2 ± 1.0 ly（6.5 ± 0.3 pc）（半光度半徑rh）[3]
估計年齡~ 12 Gyr [2]
其它名稱SKHB 1, HBK 0-1[1]
參見：球狀星團，球狀星團表

馬亞爾II（M31的G1），也稱為NGC-224-G1、SKHB 1、GSC 2788:2139、HBK 0-1、M31GC J003247+393440或仙女的星團，是一個繞著M31，也就是仙女座星系的球狀星團。

它的位置在距離仙女座星系核心130,000光年（40Kpc）[3]，並且是本星系群中絕對星等最亮[3]的球狀星團，視星等為13.7等。G 1的質量被認為是半人馬座ω的兩倍，並且在核心可能有中等質量的黑洞（∼ 2×104 M⊙）[3]。

它是由尼古拉斯馬亞爾（Nicholas Mayall）和O.J. Eggen在1953年首度從帕洛馬山天文台48吋施密特望遠鏡在1948年拍攝的乾版上檢出的。

由於恆星金屬量的分布很廣，包含了數個世代的恆星和許多的恆星創生时期，顯示經歷了數個世代的恆星創生，所以許多人認為他不是個真正的球狀星團，而是被仙女座星系吞噬的矮星系殘留下的星系核心殘骸[3][4]。

名稱的來源

相關條目

參考資料

  1. ^ 1.0 1.1 1.2 1.3 SIMBAD Astronomical Database. Results for Mayall II. [2009-09-13]. （原始内容存档于2019-05-30）.  （页面存档备份，存于互联网档案馆）
  2. ^ 2.0 2.1 Ma, Jun; de Grijs, Richard; Fan, Zhou; Rey, Soo-Chang; Wu, Zhen-Yu; Zhou, Xu; Wu, Jiang-Hua; Jiang, Zhao-Ji; Chen, Jian-Sheng; Lee, Kyungsook; Sohn, Sangmo Tony. RESEARCH PAPER: Old stellar population synthesis: new age and mass estimates for Mayall II = G1. Research in Astronomy and Astrophysics. June 2009, 9 (6): 641–652. Bibcode:2009RAA.....9..641M. arXiv:0904.0674 可免费查阅. doi:10.1088/1674-4527/9/6/003. 
  3. ^ 3.0 3.1 3.2 3.3 3.4 Ma, J.; de Grijs, R.; Chen, D.; van den Bergh, S.; Fan, Z.; Wu, Z.; Wu, H.; Zhou, X.; Wu, J.; Jiang, Z.; Chen, J. Structural parameters of Mayall II = G1 in M31. Monthly Notices of the Royal Astronomical Society. April 2007, 376 (4): 1621–1629. Bibcode:2007MNRAS.376.1621M. arXiv:astro-ph/0702012 可免费查阅. doi:10.1111/j.1365-2966.2007.11573.x. 
  4. ^ Meylan, G.; Sarajedini, A.; Jablonka, P.; Djorgovski, S. G.; Bridges, T.; Rich, R. M. Mayall II=G1 in M31: Giant Globular Cluster or Core of a Dwarf Elliptical Galaxy?. The Astronomical Journal. August 2001, 122 (2): 830–841. Bibcode:2001AJ....122..830M. arXiv:astro-ph/0105013 可免费查阅. doi:10.1086/321166. 

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