Cluster analysis of massive datasets in astronomy
Cluster analysis of massive datasets in astronomy
复制标题
天文学海量数据集的聚类分析
DOI:
10.1007/s11222-007-9027-x
复制
发表时间:
2007
影响因子:
2.2
通讯作者:
M. Hendry
中科院分区:
文献类型:
--
作者:
Woncheol Jang;M. Hendry
Abstract
Clusters of galaxies are a useful proxy to trace the distribution of mass in the universe. By measuring the mass of clusters of galaxies on different scales, one can follow the evolution of the mass distribution (Martínez and Saar, Statistics of the Galaxy Distribution, 2002). It can be shown that finding galaxy clusters is equivalent to finding density contour clusters (Hartigan, Clustering Algorithms, 1975): connected components of the level set Sc≡{f>c} where f is a probability density function. Cuevas et al. (Can. J. Stat. 28, 367–382, 2000; Comput. Stat. Data Anal. 36, 441–459, 2001) proposed a nonparametric method for density contour clusters, attempting to find density contour clusters by the minimal spanning tree. While their algorithm is conceptually simple, it requires intensive computations for large datasets. We propose a more efficient clustering method based on their algorithm with the Fast Fourier Transform (FFT). The method is applied to a study of galaxy clustering on large astronomical sky survey data.