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Astrophysics > Cosmology and Nongalactic Astrophysics

arXiv:1611.09892 (astro-ph)
[Submitted on 29 Nov 2016 (v1), last revised 19 Dec 2017 (this version, v3)]

Title:A Computationally Efficient Approach for Calculating Galaxy Two-Point Correlations

Authors:Regina Demina, Sanha Cheong, Segev BenZvi, Otto Hindrichs
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Abstract: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.
Comments: 8 pages, 10 figures
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Cite as: arXiv:1611.09892 [astro-ph.CO]
  (or arXiv:1611.09892v3 [astro-ph.CO] for this version)
  https://doi.org/10.48550/arXiv.1611.09892

Submission history

From: Sanha Cheong [view email]
[v1] Tue, 29 Nov 2016 21:31:46 UTC (294 KB)
[v2] Tue, 23 May 2017 21:55:36 UTC (1,988 KB)
[v3] Tue, 19 Dec 2017 00:17:10 UTC (834 KB)
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