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Research at St Andrews

The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological implications of the Fourier space wedges of the final sample

Research output: Contribution to journalArticle

Author(s)

Jan Niklas Grieb, Ariel G. Sánchez, Salvador Salazar-Albornoz, Román Scoccimarro, Martín Crocce, Claudio Dalla Vecchia, Francesco Montesano, Héctor Gil-Marín, Ashley J. Ross, Florian Beutler, Sergio Rodríguez-Torres, Chia-Hsun Chuang, Francisco Prada, Francisco-Shu Kitaura, Antonio J. Cuesta, Daniel J. Eisenstein, Will J. Percival, Mariana Vargas-Magaña, Jeremy L. Tinker, Rita Tojeiro & 8 more Joel R. Brownstein, Claudia Maraston, Robert C. Nichol, Matthew D. Olmstead, Lado Samushia, Hee-Jong Seo, Alina Streblyanska, Gong-bo Zhao

School/Research organisations

Abstract

We extract cosmological information from the anisotropic power-spectrum measurements from the recently completed Baryon Oscillation Spectroscopic Survey (BOSS), extending the concept of clustering wedges to Fourier space. Making use of new fast-Fourier-transform-based estimators, we measure the power-spectrum clustering wedges of the BOSS sample by filtering out the information of Legendre multipoles ℓ > 4. Our modelling of these measurements is based on novel approaches to describe non-linear evolution, bias and redshift-space distortions, which we test using synthetic catalogues based on large-volume N-body simulations. We are able to include smaller scales than in previous analyses, resulting in tighter cosmological constraints. Using three overlapping redshift bins, we measure the angular-diameter distance, the Hubble parameter and the cosmic growth rate, and explore the cosmological implications of our full-shape clustering measurements in combination with cosmic microwave background and Type Ia supernova data. Assuming a Λ cold dark matter (ΛCDM) cosmology, we constrain the matter density to ΩM=0.311+0.009/−0.010 and the Hubble parameter to H0=67.6+0.7/−0.6kms−1 Mpc−1, at a confidence level of 68 per cent. We also allow for non-standard dark energy models and modifications of the growth rate, finding good agreement with the ΛCDM paradigm. For example, we constrain the equation-of-state parameter to w=−1.019+0.048/−0.039. This paper is part of a set that analyses the final galaxy-clustering data set from BOSS. The measurements and likelihoods presented here are combined with others in Alam et al. to produce the final cosmological constraints from BOSS.
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Original languageEnglish
Pages (from-to)2085-2112
JournalMonthly Notices of the Royal Astronomical Society
Volume467
Issue number2
Early online date4 Jan 2017
DOIs
Publication statusPublished - Jan 2017

    Research areas

  • Cosmology: observations, Cosmological parameters, Dark energy, Large-scale structure of Universe

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