高阶3D Voronoi曲面细分识别孤立星系、星系对和星系三重体
High-order 3D Voronoi tessellation for identifying Isolated galaxies, Pairs and Triplets
摘要：
提出了一种基于高阶三维Voronoi曲面的几何方法来识别单星系、星系对和三星系。这种方法可以选择不同环境中的小星系群和孤立星系，并找到孤立系。使用了SDSS DR 5光谱巡天中体积有限的星系样本。我们的结论是，在这样小的群体，如对和三胞胎的分离光度清楚地观察到：在孤立的对和三胞胎的星系平均两倍以上的亮度比孤立的星系。我们考虑了不同系统中的暗物质含量。孤立对的质光比中值为12 M_sol/L_sol，孤立三重态的质光比中值为44 M_sol/L_sol，最紧密的三重态的质光比中值为7（8）M_sol/L_sol。我们还发现，在更密集的环境中的系统有更大的均方根速度和质光比。
英文摘要：
Geometric method based on the high-order 3D Voronoi tessellation is proposed for identifying the single galaxies, pairs and triplets. This approach allows to select small galaxy groups and isolated galaxies in different environment and find the isolated systems. The volume-limited sample of galaxies from the SDSS DR5 spectroscopic survey was used. We conclude that in such small groups as pairs and triplets the segregation by luminosity is clearly observed: galaxies in the isolated pairs and triplets are on average two times more luminous than isolated galaxies. We consider the dark matter content in different systems. The median values of mass-to-luminosity ratio are 12 M_sol/L_sol for the isolated pairs and 44 M_sol/L_sol for the isolated triplets; 7 (8) M_sol/L_sol for the most compact pairs (triplets). We found also that systems in the denser environment have greater rms velocity and mass-to-luminosity ratio.
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