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Catalogues of isolated galaxies, isolated pairs, and isolated triplets in the local Universe

机译:本地宇宙中孤立星系,孤立对和孤立三胞胎的目录

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Context. The construction of catalogues of galaxies and the a posteriori study of galaxy properties in relation to their environment have been hampered by scarce redshift information. The new 3-dimensional (3D) surveys permit small, faint, physically bound satellites to be distinguished from a background-projected galaxy population, giving a more comprehensive 3D picture of the surroundings. Aims. We aim to provide representative samples of isolated galaxies, isolated pairs, and isolated triplets for testing galaxy evolution and secular processes in low density regions of the local Universe, as well as to characterise their local and large-scale environments. Methods. We used spectroscopic data from the tenth data release of the Sloan Digital Sky Survey (SDSS-DR10) to automatically and homogeneously compile catalogues of 3702 isolated galaxies, 1240 isolated pairs, and 315 isolated triplets in the local Universe (z ≤ 0.080). To quantify the effects of their local and large-scale environments, we computed the projected density and the tidal strength for the brightest galaxy in each sample. Results. We find evidence of isolated pairs and isolated triplets that are physically bound at projected separations up to d ≤ 450?kpc with radial velocity difference Δν ≤ 160?km?s-1, where the effect of the companion typically accounts for more than 98% of the total tidal strength affecting the central galaxy. For galaxies in the catalogues, we provide their positions, redshifts, and degrees of relation with their physical and large-scale environments. The catalogues are publicly available to the scientific community. Conclusions. For isolated galaxies, isolated pairs, and isolated triplets, there is no difference in their degree of interaction with the large-scale structure (up to 5?Mpc), which may suggest that they have a common origin in their formation and evolution. We find that most of them belong to the outer parts of filaments, walls, and clusters, and generally differ from the void population of galaxies.
机译:上下文。稀少的红移信息阻碍了星系目录的构建以及与环境有关的星系性质的后验研究。新的3维(3D)测量技术可以将小型,微弱,物理绑定的卫星与背景投影的银河种群区分开来,从而为周围环境提供更全面的3D图像。目的我们旨在提供具有代表性的孤立星系,孤立星对和孤立三胞胎样本,以测试本地宇宙低密度区域中的星系演化和世俗过程,以及表征其本地和大规模环境。方法。我们使用了来自斯隆数字天空调查(SDSS-DR10)的第十次数据发布的光谱数据,自动并均匀地编制了本地宇宙中3702个孤立星系,1240个孤立星对和315个孤立三胞胎的目录(z≤0.080)。为了量化其局部和大规模环境的影响,我们计算了每个样本中最亮的星系的投影密度和潮汐强度。结果。我们找到了孤立对和孤立三胞胎的证据,这些孤立对和孤立三胞胎在投影间隔达d≤450?kpc的情况下物理结合,径向速度差Δν≤160?km?s-1,其中伴星的影响通常占98%以上影响中央星系的总潮汐强度对于目录中的星系,我们提供了它们的位置,红移以及与它们的物理环境和大规模环境的关联度。这些目录向科学界公开提供。结论。对于孤立的星系,孤立的对和孤立的三胞胎,它们与大型结构(高达5?Mpc)的相互作用程度没有差异,这可能表明它们在形成和演化中具有共同的起源。我们发现它们大多数属于细丝,壁和星团的外部​​,并且通常不同于星系的空人口。

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