Cosmological constraints from applying SHAM to rescaled cosmological simulations

Simha, V; Cole, S

doi:10.1093/mnras/stt1643

Cosmological constraints from applying SHAM to rescaled cosmological simulations

Simha, V; Cole, S

Authors

V Simha

Professor Shaun Cole shaun.cole@durham.ac.uk
Director of the Institute for Computational Cosmology

Abstract

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.

Citation

Simha, V., & Cole, S. (2013). Cosmological constraints from applying SHAM to rescaled cosmological simulations. Monthly Notices of the Royal Astronomical Society, 436(2), 1142-1151. https://doi.org/10.1093/mnras/stt1643

Journal Article Type	Article
Publication Date	Dec 1, 2013
Deposit Date	Oct 4, 2013
Publicly Available Date	Oct 15, 2013
Journal	Monthly Notices of the Royal Astronomical Society
Print ISSN	0035-8711
Electronic ISSN	1365-2966
Publisher	Royal Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	436
Issue	2
Pages	1142-1151
DOI	https://doi.org/10.1093/mnras/stt1643
Keywords	Methods, Numerical, Galaxies, Haloes, Cosmological parameters, Large-scale structure of Universe.

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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.