Galaxy And Mass Assembly (GAMA): the large-scale structure of galaxies and comparison to mock universes
Galaxy And Mass Assembly (GAMA): the large-scale structure of galaxies and comparison to mock universes
复制标题
星系和质量组装（GAMA）：星系的大尺度结构以及与模拟宇宙的比较
DOI：
10.1093/mnras/stt2136
复制
发表时间：
2014
影响因子：
4.8
通讯作者：
Alpaslan M
中科院分区：
文献类型：
--
作者：
Alpaslan M
从45542个星系和6000个z ≤ 0.213的星系群的有限体积样本中，我们使用了一种改进的最小生成树算法来识别和分类星系和质量大会（GAMA）调查中的大尺度结构。利用星系群，我们在三个赤道GAMA场中识别出643个长度达200 h −1Mpc的暗条，每个暗条平均包含8个星系群。通过分析不属于星系群的星系，我们发现了一个完全由星系组成的较小相干结构的次级群体，被称为“卷须”，它们似乎将细丝连接在一起，或渗透到空隙中，通常测量长度约为10h−1Mpc，平均包含6个星系。最后，我们还能够识别孤立的空星系群。通过在GAMA模拟星系表上运行该算法，我们比较了观测数据和模拟数据之间的大尺度结构特征，发现模拟细丝非常好地再现了观测数据。这提供了一个探针的高阶分布统计没有捕获的常用的两点相关函数。
From a volume-limited sample of 45 542 galaxies and 6000 groups withz≤ 0.213, we use an adapted minimal spanning tree algorithm to identify and classify large-scale structures within the Galaxy And Mass Assembly (GAMA) survey. Using galaxy groups, we identify 643 filaments across the three equatorial GAMA fields that span up to 200h−1Mpc in length, each with an average of eight groups within them. By analysing galaxies not belonging to groups, we identify a secondary population of smaller coherent structures composed entirely of galaxies, dubbed ‘tendrils’ that appear to link filaments together, or penetrate into voids, generally measuring around 10h−1Mpc in length and containing on average six galaxies. Finally, we are also able to identify a population of isolated void galaxies. By running this algorithm on GAMA mock galaxy catalogues, we compare the characteristics of large-scale structure between observed and mock data, finding that mock filaments reproduce observed ones extremely well. This provides a probe of higher order distribution statistics not captured by the popularly used two-point correlation function.