蜻蜓44星系是后发座星系团中的一个超稀疏星系[2][3][4]。根据观测其旋转速度判断其质量为一万亿太阳质量，约和银河系的质量相同。这也和周围观测到的90个球状星团一致。不过此星系发出的光只有银河系的1%[5]。该星系由蜻蜓望远镜头阵列（Dragonfly Telephoto Array）发现[6]。
2016年8月时，科学家指出蜻蜓44星系几乎完全是由暗物质组成[7][8][9]。
- ^ 1.0 1.1 1.2 Van Dokkum, Pieter; et al. Spectroscopic confirmation of the existence of large, diffuse galaxies in the coma cluster. The Astrophysical Journal Letters. 1 May 2015 [1 September 2016]. （原始内容存档于2021-03-30）.
- ^ Scientists discover the fluffiest galaxies. phys.org. 14 May 2015 [2016-08-31]. （原始内容存档于2016-08-26）.
- ^ Van Dokkum, Pieter; et al. Forty-seven milky way-sized, extremely diffuse galaxies in the Coma-Cluster. The Astrophysical Journal Letters. 7 January 2015 [31 August 2016]. （原始内容存档于2017-06-06）.
- ^ Dragonfly 44: Ultra-Diffuse Galaxy Made Mostly of Dark Matter. Aug 2016. [2016-08-31]. （原始内容存档于2020-11-12）.
- ^ Crosswell, Ken. The Milky Way’s dark twin revealed. Nature News. 26 July 2016 [30 July 2016]. （原始内容存档于2016-10-13）.
- ^ Rachel Feltman. A new class of galaxy has been discovered, one made almost entirely of dark matter. Washington Post. 25 August 2016 [2016-11-01]. （原始内容存档于2020-12-02）.
- ^ Van Dokkum, Pieter; et al. A High Stellar Velocity Dispersion and ~100 Globular Clusters For The Ultra-Diffuse Galaxy Dragonfly 44. The Astrophysical Journal Letters. 25 August 2016 [27 August 2016]. （原始内容存档于2019-08-30）.
- ^ Hall, Shannon. Ghost galaxy is 99.99 per cent dark matter with almost no stars. New Scientist. 25 August 2016 [27 August 2016]. （原始内容存档于2019-04-11）.
- ^ Feltman, Rachael. A new class of galaxy has been discovered, one made almost entirely of dark matter. The Washington Post. 26 August 2016 [26 August 2016]. （原始内容存档于2018-04-02）.
