A computationally efficient approach for calculating galaxytwo-point correlations

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 po...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2018-10, Vol.480 (1), p.49-56
Main Authors: Demina, Regina, Cheong, Sanha, BenZvi, Segev, Hindrichs, Otto
Format: Article
Language:English
Subjects:
Astronomy & Astrophysics
ASTRONOMY AND ASTROPHYSICS
dark energy
distance scale
galaxies: statistics
large-scale structure of Universe
methods: data analysis
surveys
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Summary: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 catalogue. The assumption that the distribution of random galaxies in redshift is independent of angular position allows us to replace pair-wise combinatorics with fast integration over probability maps. The new method significantly reduces the computation time while simultaneously increasing the precision of the calculation. Also, it only requires cosmological parameters at the last and least computationally expensive stage, which allows for faster exploration of the parameter space.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/sty1812