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帕罗马5

帕罗马5
Pal5_-_SDSS_DR14_(panorama).jpg
观测数据(J2000 历元)
分类XII
星座巨蛇座
赤经15h 16m 05.3s[1]
赤纬–00° 06′ 41″[1]
距离76 kly(23 kpc[2]
视星等 (V)+11.75
视直径(V)6′.9
物理性质
Mass3.00×104[3] M
半径76 ly[4]
估计年龄115±10亿年[5]
值得注意的特色被误认为是矮星系
其它名称UGC 9792, GCl 32[1]

帕罗马 5沃尔特·巴德于1950年发现的球状星团。1955年阿尔伯特·乔治·威尔逊再次独立发现了它。在最初以巨蛇为名命名之后,被收录于帕罗马目录中的第五号。

由于银河系的引力作用,这个星团有一个分裂的过程。事实上,有许多恒恒星以星流的形式离开这个星团。这条星流的质量为5,000个太阳质量,长度为30,000光年[6]。该星团现时位于银河系中心的60.6 kly(18.6 kpc)。它的半长轴和半短轴之间的长宽比为 0.62±0.23,显示出明显的扁平化[7]

相关条目

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参考资料

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  1. ^ 1.0 1.1 1.2 SIMBAD Astronomical Database. Results for Palomar 5. [2006-11-17]. (原始内容存档于2016-03-15). 
  2. ^ Hessels, J. W. T.; et al, A 1.4 GHz Arecibo Survey for Pulsars in Globular Clusters, The Astrophysical Journal, November 2007, 670 (1): 363–378, Bibcode:2007ApJ...670..363H, S2CID 16914232, arXiv:0707.1602可免费查阅, doi:10.1086/521780. 
  3. ^ Boyles, J.; et al, Young Radio Pulsars in Galactic Globular Clusters, The Astrophysical Journal, November 2011, 742 (1): 51, Bibcode:2011ApJ...742...51B, S2CID 118649860, arXiv:1108.4402可免费查阅, doi:10.1088/0004-637X/742/1/51. 
  4. ^ distance × sin( diameter_angle / 2 ) = 76 ly. radius
  5. ^ Martell, S. L.; Smith, G. H.; Grillmair, C. J. A New Age Measurement for Palomar 5. American Astronomical Society, 201st AAS Meeting, #07.11; Bulletin of the American Astronomical Society. 2002, 34: 1103. Bibcode:2002AAS...201.0711M. 
  6. ^ Ibata, Rodrigo; Gibson, Brad. The Ghosts of Galaxies Past. Scientific American. April 2007, 296 (4): 40–45. Bibcode:2007SciAm.296d..40I. ISSN 0036-8733. PMID 17479629. doi:10.1038/scientificamerican0407-40. 
  7. ^ Chen, C. W.; Chen, W. P., Morphological Distortion of Galactic Globular Clusters, The Astrophysical Journal, October 2010, 721 (2): 1790–1819, Bibcode:2010ApJ...721.1790C, doi:10.1088/0004-637X/721/2/1790可免费查阅 

外部链接

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帕罗马5
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