双鱼座I (矮星系)

双鱼座I矮星系
观测资料（J2000 历元）
星座	双鱼座
赤经	01h 03m 56.6s
赤纬	+21° 53′ 41″
距离	260 kly（80 kpc）
绝对星等 (V)	−10.35
特征
类型	dIrr/dSph
角直径 (V)	~1°
其他名称
	双鱼座高密度区、 Psc I、 PGC 3792、LEDA 3792。
	参见：星系、星系列表

双鱼座I （Psc I）或双鱼座高密度区（Pisces Overdensity）是在银河系的银晕内的恒星丛集，也可能是一个发育不全的矮椭球星系^[7]。它坐落在双鱼座，并且在2009年分析的史隆数位巡天资料中发现分布著天琴座RR变星^[2]。这个星系距离太阳大约8万秒差距，并以75公里/秒朝向太阳移动^[4]。

双鱼座I是银河系最黯淡的卫星星系之一^[7]，质量大约是10⁵太阳质量^[2]。然而，它的角直径很大，有好几度（大约1,000秒差距），可能是在被引力约束的星系和未被引力约束的星系之间过渡状态的系统^[4]。双鱼座I的位置接近大麦哲伦云所在的平面，两者之间可能存在著关联 ^[2]。

参考资料[编辑]

^ ^1.0 ^1.1 Karachentsev ID, et al. A Catalog of Neighboring Galaxies. Astronomical Journal. 2004, 127 (4): 2031–2068. Bibcode:2004AJ....127.2031K. doi:10.1086/382905.
^ ^2.0 ^2.1 ^2.2 ^2.3 ^2.4 Watkins, L. L.; et al, Substructure revealed by RR Lyraes in SDSS Stripe 82, Monthly Notices of the Royal Astronomical Society, 2009, 398 (4): 1757–70, Bibcode:2009MNRAS.398.1757W, arXiv:0906.0498 , doi:10.1111/j.1365-2966.2009.15242.x.
^ ^3.0 ^3.1 Boyer, Martha L; Skillman, Evan D; Van Loon, Jacco Th; Gehrz, Robert D; Woodward, Charles E. Aspitzerstudy of Asymptotic Giant Branch Stars. Iii. Dust Production and Gas Return in Local Group Dwarf Irregular Galaxies. The Astrophysical Journal. 2009, 697 (2): 1993. Bibcode:2009ApJ...697.1993B. arXiv:0903.3871 . doi:10.1088/0004-637X/697/2/1993.
^ ^4.0 ^4.1 ^4.2 Kollmeier, Juna A.; et al, Spectroscopic Confirmation of the Pisces Overdensity, The Astrophysical Journal Letters, 2009, 705 (2): L158–L162, Bibcode:2009ApJ...705L.158K, arXiv:0908.1381 , doi:10.1088/0004-637X/705/2/L158.
^ ^5.0 ^5.1 [
http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NAME+Pisces+I
NAME Pisces I] 请检查|url=值 (帮助). SIMBAD. 斯特拉斯堡天文资料中心. [23 March 2018].
^ Object No. 1 - Pisces I. NASA/IPAC Extragalactic Database. [2018-09-10]. （原始内容存档于2019-12-12）.
^ ^7.0 ^7.1 Belokurov, V.; et al, Big fish, small fish: Two New Ultra-Faint Satellites of the Milky Way, The Astrophysical Journal Letters, 2010, 712: L103–106, Bibcode:2010ApJ...712L.103B, arXiv:1002.0504 , doi:10.1088/2041-8205/712/1/L103.

[Karachentsev2004-1] 1.0 ^1.1 Karachentsev ID, et al. A Catalog of Neighboring Galaxies. Astronomical Journal. 2004, 127 (4): 2031–2068. Bibcode:2004AJ....127.2031K. doi:10.1086/382905.

[Watkins2009-2] 2.0 ^2.1 ^2.2 ^2.3 ^2.4 Watkins, L. L.; et al, Substructure revealed by RR Lyraes in SDSS Stripe 82, Monthly Notices of the Royal Astronomical Society, 2009, 398 (4): 1757–70, Bibcode:2009MNRAS.398.1757W, arXiv:0906.0498 , doi:10.1111/j.1365-2966.2009.15242.x.

[Boyer2009-3] 3.0 ^3.1 Boyer, Martha L; Skillman, Evan D; Van Loon, Jacco Th; Gehrz, Robert D; Woodward, Charles E. Aspitzerstudy of Asymptotic Giant Branch Stars. Iii. Dust Production and Gas Return in Local Group Dwarf Irregular Galaxies. The Astrophysical Journal. 2009, 697 (2): 1993. Bibcode:2009ApJ...697.1993B. arXiv:0903.3871 . doi:10.1088/0004-637X/697/2/1993.

[Kollmeier2009-4] 4.0 ^4.1 ^4.2 Kollmeier, Juna A.; et al, Spectroscopic Confirmation of the Pisces Overdensity, The Astrophysical Journal Letters, 2009, 705 (2): L158–L162, Bibcode:2009ApJ...705L.158K, arXiv:0908.1381 , doi:10.1088/0004-637X/705/2/L158.

[SIMBAD-5] 5.0 ^5.1 [
http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NAME+Pisces+I
NAME Pisces I] 请检查|url=值 (帮助). SIMBAD. 斯特拉斯堡天文资料中心. [23 March 2018].

[NED-6] Object No. 1 - Pisces I. NASA/IPAC Extragalactic Database. [2018-09-10]. （原始内容存档于2019-12-12）.

[Belokurov2010-7] 7.0 ^7.1 Belokurov, V.; et al, Big fish, small fish: Two New Ultra-Faint Satellites of the Milky Way, The Astrophysical Journal Letters, 2010, 712: L103–106, Bibcode:2010ApJ...712L.103B, arXiv:1002.0504 , doi:10.1088/2041-8205/712/1/L103.

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