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The neighborhood function and its application to identifying large-scale structure in the comoving universe frame
Tan YP(覃一平)1,2,3; Lv LZ(吕连忠)2,3,4; Zhang FW(张富文)2,4; Zhang BB(张彬彬)2,4; Zhang J(张晋)2,4; Qin, YP (reprint author), Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL
2007-11-10
卷号669期号:2页码:692-713
DOI10.1086/521812
产权排序第2完成单位
收录类别SCI
关键词Cosmology : Observations Galaxies : Distances And Redshifts Galaxies : Statistics Large-scale Structure Of Universe Methods : Data Analysis
摘要In this paper a relative number density parameter, called the neighborhood function, is introduced so that the crowded nature of the neighborhood of individual sources can be described. With this parameter one can determine the probability of forming a cluster by chance. A method is proposed to identify large-scale structure in the cosmological comoving frame. The scale used to sort out clustered sources is determined by the mean local number density, and the sample adopted is required to have regular borders. The method is applied to a sample drawn from the Two Degree Field survey. We find from the analysis that the probability of forming the resulting large-scale structures by chance is very small, and the phenomenon of clustering is dominant in the local universe. Within a 3 sigma confidence level, a coherent cluster with a scale as large as 357h(-1)Mpc is identified from the sample. There exist some galaxies which are not affected by the gravitation of clusters, and hence are suspected to be at rest in the comoving frame of the universe. Voids are likely volumes within which very crowded sources are not present, and they are likely formed in embryo by fluctuations in the very early epochs of the universe. In addition, we find that large-scale structures are coral-like and are likely made up of smaller structures; sources with large values of the neighborhood function are mainly distributed within the structure of prominent clusters, and they form the framework of the large-scale structure.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000250760500004
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]GALAXY REDSHIFT SURVEY ; DIGITAL-SKY-SURVEY ; COLD DARK MATTER ; POWER-SPECTRUM ANALYSIS ; LYMAN-BREAK GALAXIES ; LOCAL SUPERCLUSTER ; INTERCLUSTER FILAMENTS ; DATA-RELEASE ; CATALOG ; PROTOCLUSTER
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/7017
专题星系研究组
通讯作者Qin, YP (reprint author), Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Peoples R China.
作者单位1.Center for Astrophysics, Guangzhou University, Guangzhou 510006, China
2.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
3.Physics Department, Guangxi University, Nanning 530004, China
4.Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
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GB/T 7714
Tan YP,Lv LZ,Zhang FW,et al. The neighborhood function and its application to identifying large-scale structure in the comoving universe frame[J]. ASTROPHYSICAL JOURNAL,2007,669(2):692-713.
APA Tan YP,Lv LZ,Zhang FW,Zhang BB,Zhang J,&Qin, YP .(2007).The neighborhood function and its application to identifying large-scale structure in the comoving universe frame.ASTROPHYSICAL JOURNAL,669(2),692-713.
MLA Tan YP,et al."The neighborhood function and its application to identifying large-scale structure in the comoving universe frame".ASTROPHYSICAL JOURNAL 669.2(2007):692-713.
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