Galaxy and Mass Assembly (GAMA): fine filaments of galaxies detected within voids
Galaxy and Mass Assembly (GAMA): fine filaments of galaxies detected within voids
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星系和质量组装（GAMA）：在空隙中检测到星系的细丝
DOI：
10.1093/mnrasl/slu019
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Alpaslan M
中科院分区：
文献类型：
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作者：
Alpaslan M
根据星系和质量大会（GAMA）调查的数据，我们报告了我们称之为星系“卷须”的结构的发现：植根于细丝并终止于邻近细丝或空隙的连贯的、薄的星系链。卷须平均包含6个星系，跨度为10h - 1Mpc。我们使用所谓的线相关函数来证明卷须代表真实的结构而不是偶然的排列。我们表明，在斯隆数字巡天（第7次数据发布巡天）中发现的空洞与伽马伽马区域重叠，其中包含大量星系，主要属于卷须。这意味着空洞的大小在很大程度上取决于测量的数量密度和灵敏度极限。我们警告说，在低密度区域的星系，可能被定义为“空洞星系”，将有局部星系数密度，这取决于这样的观测极限，可能比那些可以直接测量的要高。
Based on data from the Galaxy and Mass Assembly (GAMA) survey, we report on the discovery of structures that we refer to as ‘tendrils’ of galaxies: coherent, thin chains of galaxies that are rooted in filaments and terminate in neighbouring filaments or voids. On average, tendrils contain six galaxies and span 10h−1Mpc. We use the so-called line correlation function to prove that tendrils represent real structures rather than accidental alignments. We show that voids found in the Sloan Digital Sky Survey, 7th data release survey that overlap with GAMA regions contain a large number of galaxies, primarily belonging to tendrils. This implies that void sizes are strongly dependent on the number density and sensitivity limits of a survey. We caution that galaxies in low-density regions, which may be defined as ‘void galaxies,’ will have local galaxy number densities that depend on such observational limits and are likely higher than those can be directly measured.