A computationally efficient approach for calculating galaxytwo-point correlations
A computationally efficient approach for calculating galaxytwo-point correlations
复制标题
一种计算星系两点相关性的高效计算方法
DOI：
10.1093/mnras/sty1812
复制
发表时间：
2016
影响因子：
4.8
通讯作者：
O. Hindrichs
中科院分区：
文献类型：
--
作者：
R. Demina;S. Cheong;S. BenZvi;O. Hindrichs
我们对宇宙学中大尺度结构分析中常用的两点关联函数的计算进行了改进。通过将观测到的星系分布与均匀填充的随机星表的分布进行对比，构造了两点关联函数的估计器。利用随机星系在红移中的分布与角位置无关的假设，我们可以用概率图上的快速积分来代替成对组合学。该方法在提高计算精度的同时，大大减少了计算时间。它还允许仅在计算成本最低的最后阶段引入宇宙学参数，这在探索这些参数的各种选择时很有帮助。
We developed a modification to the calculation of the two-point correlation function commonly used in the analysis of large scale structure in cosmology. An estimator of the two-point correlation function is constructed by contrasting the observed distribution of galaxies with that of a uniformly populated random catalog. Using the assumption that the distribution of random galaxies in redshift is independent of angular position allows us to replace pairwise combinatorics with fast integration over probability maps. The new method significantly reduces the computation time while simultaneously increasing the precision of the calculation. It also allows to introduce cosmological parameters only at the last and least computationally expensive stage, which is helpful when exploring various choices for these parameters.
DOI：
10.1111/j.1365-2966.2012.22066.x
发表时间：
2012-12-01
影响因子：
4.8
作者：
Anderson, Lauren;Aubourg, Eric;Zhao, Gong-Bo
通讯作者：
Zhao, Gong-Bo