发现局域宇宙中罕见的矮星系群

Sanjaya Paudel, Cristiano G. Sabiu, Suk-Jin Yoon, Pierre-Alain Duc, Jaewon Yoo and Oliver Müller
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引用次数: 0

摘要

我们报告发现了一个罕见的由五个矮星系组成的孤立星系群,它们位于 z = 0.0086 (D = 36 Mpc)。所有成员星系都是正在形成恒星的、蓝色的、富含气体的星系,其 g - r 指数在 0.2 到 0.6 等之间,其中两个星系显示出正在发生相互作用的迹象。该星系群中质量最大的成员的恒星质量是小麦哲伦云恒星质量的一半,星系群成员恒星质量的中位数为 7.87 × 107M☉。得出的该星系群的总动力质量为 Mdyn = 6.02 × 1010M☉,而其总重子质量(恒星质量 + H i)为 2.6 × 109M☉,因此动力质量与重子质量比为 23。观测到的成员星系的空间范围是 154 kpc,它们的相对视线速度跨度在 75 km s-1 以内。利用暗能量光谱仪早期发布的数据提供的空间分辨光学光谱,我们发现该星系群的三个成员具有共同的旋转方向。鉴于该星系群及其成员星系的这些独特性质,我们讨论了这样一个星系在矮星系群的形成和演化以及检验大尺度结构形成理论中可能具有的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Discovery of a Rare Group of Dwarf Galaxies in the Local Universe
We report the discovery of a rare isolated group of five dwarf galaxies located at z = 0.0086 (D = 36 Mpc). All member galaxies are star forming, blue, and gas rich, with g − r indices ranging from 0.2 to 0.6 mag, and two of them show signs of ongoing mutual interaction. The most massive member of the group has a stellar mass that is half of the Small Magellanic Cloud stellar mass, and the median stellar mass of the group members is 7.87 × 107M☉. The derived total dynamical mass of the group is Mdyn = 6.02 × 1010M☉, whereas its total baryonic mass (stellar + H i) is 2.6 × 109M☉, which gives us the dynamical to baryonic mass ratio of 23. Interestingly, all galaxies found in the group are aligned along a straight line in the plane of the sky. The observed spatial extent of the member galaxies is 154 kpc, and their relative line-of-sight velocity span is within 75 km s−1. Using the spatially resolved optical spectra provided by the Dark Energy Spectroscopic Instrument early data release, we find that three group members share a common rotational direction. With these unique properties of the group and its member galaxies, we discuss the possible importance of such a system in the formation and evolution of dwarf galaxy groups and in testing the theory of large-scale structure formation.
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