唧筒座2

唧筒座2
唧筒座2
	Illustration
观测资料（J2000 历元）
星座	唧筒座
赤经	9h 35m 32.832s
赤纬	-37° 13m 57.72s
距离	405,000 ly（124.1 kpc）
属于	Local Group
绝对星等 (V)	−9.86±0.08 mag
特征
类型	Irr-T
大小	11 kly
有效半径 (P)	2.5 kpc
有效半径 (A)	1.10°
其他	银河系卫星星系
其他名称
	Antlia 2, Ant 2, Ant Il, UGC 49743, CGCG 49794-49.4794
	参见：星系、星系列表

唧筒座2是银河系的一个低表面亮度矮卫星星系，位于银纬11.2°。它在天空中的跨度约为1.26°，位于唧筒座ε的东南方向。该星系的大小与大麦哲伦星云相似，但亮度只有大麦哲伦星云的1/10,000。唧筒座2星系是迄今为止发现的所有星系中表面亮度最低的星系^[4] ，其弥散程度是任何已知超稀疏星系的100倍左右^[1]。该星系的巨大尺寸表明它目前正受到潮汐力的破坏，并正在演变为星流^[3]。唧筒座2星系的东南侧较西北侧更长，这可能是由于潮汐作用的结果^[2]。该星系于2018年11月通过欧洲航天局盖亚任务的观察数据发现。

参见

参考资料

^ ^1.0 ^1.1 ^1.2 Torrealba, G.; Belokurov, V.; Koposov, S. E.; Li, T. S.; Walker, M. G.; Sanders, J. L.; Geringer-Sameth, A.; Zucker, D. B.; Kuehn, K.; Evans, N. W.; Dehnen, W. The hidden giant: Discovery of an enormous Galactic dwarf satellite in Gaia DR2. Monthly Notices of the Royal Astronomical Society. 2019, 488 (2): 2743–2766. Bibcode:2019MNRAS.488.2743T. S2CID 118867213. arXiv:1811.04082 . doi:10.1093/mnras/stz1624 .
^ ^2.0 ^2.1 Vivas, A. Katherina; Martínez-Vázquez, Clara E.; Walker, Alistair R.; Belokurov, Vasily; Li, Ting S.; Erkal, Denis. Variable Stars in the Giant Satellite Galaxy Antlia 2. The Astrophysical Journal. 2022, 926 (1): 78. Bibcode:2022ApJ...926...78V. S2CID 245219267. arXiv:2112.08467 . doi:10.3847/1538-4357/ac43bd .
^ ^3.0 ^3.1 ^3.2 Ji, Alexander P.; Koposov, Sergey E.; Li, Ting S.; Erkal, Denis; Pace, Andrew B.; Simon, Joshua D.; Belokurov, Vasily; Cullinane, Lara R.; Da Costa, Gary S.; Kuehn, Kyler; Lewis, Geraint F.; MacKey, Dougal; Shipp, Nora; Simpson, Jeffrey D.; Zucker, Daniel B.; Hansen, Terese T.; Bland-Hawthorn, Joss; S5 Collaboration. Kinematics of Antlia 2 and Crater 2 from the Southern Stellar Stream Spectroscopic Survey (S 5). The Astrophysical Journal. 2021, 921 (1): 32. Bibcode:2021ApJ...921...32J. S2CID 235624056. arXiv:2106.12656 . doi:10.3847/1538-4357/ac1869 .
^ ESA's Gaia Spacecraft Spots Ghost Galaxy Lurking In Milky Way's Outskirts. Forbes. [November 20, 2018].

[torrealba-1] 1.0 ^1.1 ^1.2 Torrealba, G.; Belokurov, V.; Koposov, S. E.; Li, T. S.; Walker, M. G.; Sanders, J. L.; Geringer-Sameth, A.; Zucker, D. B.; Kuehn, K.; Evans, N. W.; Dehnen, W. The hidden giant: Discovery of an enormous Galactic dwarf satellite in Gaia DR2. Monthly Notices of the Royal Astronomical Society. 2019, 488 (2): 2743–2766. Bibcode:2019MNRAS.488.2743T. S2CID 118867213. arXiv:1811.04082 . doi:10.1093/mnras/stz1624 .

[Vivas-2] 2.0 ^2.1 Vivas, A. Katherina; Martínez-Vázquez, Clara E.; Walker, Alistair R.; Belokurov, Vasily; Li, Ting S.; Erkal, Denis. Variable Stars in the Giant Satellite Galaxy Antlia 2. The Astrophysical Journal. 2022, 926 (1): 78. Bibcode:2022ApJ...926...78V. S2CID 245219267. arXiv:2112.08467 . doi:10.3847/1538-4357/ac43bd .

[Ji-3] 3.0 ^3.1 ^3.2 Ji, Alexander P.; Koposov, Sergey E.; Li, Ting S.; Erkal, Denis; Pace, Andrew B.; Simon, Joshua D.; Belokurov, Vasily; Cullinane, Lara R.; Da Costa, Gary S.; Kuehn, Kyler; Lewis, Geraint F.; MacKey, Dougal; Shipp, Nora; Simpson, Jeffrey D.; Zucker, Daniel B.; Hansen, Terese T.; Bland-Hawthorn, Joss; S5 Collaboration. Kinematics of Antlia 2 and Crater 2 from the Southern Stellar Stream Spectroscopic Survey (S 5). The Astrophysical Journal. 2021, 921 (1): 32. Bibcode:2021ApJ...921...32J. S2CID 235624056. arXiv:2106.12656 . doi:10.3847/1538-4357/ac1869 .

[forbes-4] ESA's Gaia Spacecraft Spots Ghost Galaxy Lurking In Milky Way's Outskirts. Forbes. [November 20, 2018].

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