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Cosmological constraints from applying SHAM to rescaled cosmological simulations.

Simha, V. and Cole, Shaun (2013) 'Cosmological constraints from applying SHAM to rescaled cosmological simulations.', Monthly notices of the Royal Astronomical Society., 436 (2). pp. 1142-1151.


We place constraints on the matter density of the Universe and the amplitude of clustering using measurements of the galaxy two-point correlation function from the Sloan Digital Sky Survey (SDSS). We generate model predictions for different cosmologies by populating rescaled N-body simulations with galaxies using the subhalo abundance matching (SHAM) technique. We find ΩM = 0.29 ± 0.03 and σ8 = 0.86 ± 0.04 at 68 per cent confidence by fitting the observed two-point galaxy correlation function of galaxies brighter than Mr = -18 in a volume-limited sample of galaxies obtained by the SDSS. We discuss and quantify potential sources of systematic error and conclude that while there is scope for improving its robustness, the technique presented in this paper provides a powerful low-redshift constraint on the cosmological parameters that is complementary to other commonly used methods.

Item Type:Article
Keywords:Methods, Numerical, Galaxies, Haloes, Cosmological parameters, Large-scale structure of Universe.
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Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society © 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:No date available
Date deposited:15 October 2013
Date of first online publication:December 2013
Date first made open access:No date available

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