The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: single-probe measurements from DR12 galaxy clustering -- towards an accurate model

Chia-Hsun Chuang, Marcos Pellejero-Ibanez, Sergio Rodríguez-Torres, Ashley J. Ross, Gong-bo Zhao, Yuting Wang, Antonio J. Cuesta, J. A. Rubiño-Martín, Francisco Prada, Shadab Alam, Florian Beutler, Daniel J. Eisenstein, Héctor Gil-Marín, Jan Niklas Grieb, Shirley Ho, Francisco-Shu Kitaura, Will J. Percival, Graziano Rossi, Salvador Salazar-Albornoz, Lado SamushiaAriel G. Sánchez, Siddharth Satpathy, Anže Slosar, Jeremy L. Tinker, Rita Tojeiro, Mariana Vargas-Magaña, Jose A Vazquez, Joel R. Brownstein, Robert C Nichol, Matthew D Olmstead

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Abstract

We analyse the broad-range shape of the monopole and quadrupole correlation functions of the BOSS Data Release 12 (DR12) CMASS and LOWZ galaxy sample to obtain constraints on the Hubble expansion rate H(z), the angular-diameter distance DA(z), the normalised growth rate ƒ(z8(z), and the physical matter density Ωmh2. We adopt wide and flat priors on all model parameters in order to ensure the results are those of a 'single-probe' galaxy clustering analysis. We also marginalise over three nuisance terms that account for potential observational systematics affecting the measured monopole. However, such Monte Carlo Markov Chain analysis is computationally expensive for advanced theoretical models, thus we develop a new methodology to speed up our analysis. We obtain {DA(z)r s,fid/r sMpc, H(z)r s/r s,fid kms-1 Mpc-1, ƒ(z) σ8(z), Ωmh2} = {956 ± 28 , 75.0 ± 4.0, 0.397 ± 0.073, 0.143 ± 0.017} at z=0.32 and {1421 ± 23, 96.7 ± 2.7, 0.497 ± 0.058, 0.137 ± 0.015} at z=0.59 where r s is the comoving sound horizon at the drag epoch and r s,fid =147.66Mpc for the fiducial cosmology in this study. In addition, we divide the galaxy sample into four redshift bins to increase the sensitivity of redshift evolution. However, we do not find improvements in terms of constraining dark energy model parameters. Combining our measurements with Planck data, we obtain Ωm =0.306 ± 0.009, H 0=67.9 ± 0.7kms-1Mpc-1, and σ8=0.815 ± 0.009 assuming ΛCDM; Ωk=0.000 ± 0.003 assuming oCDM; w=-1.01 ± 0.06 assuming wCDM; and w0=-0.95 ± 0.22 and wa=-0.22 ± 0.63 assuming w0wa CDM. Our results show no tension with the flat ΛCDM cosmological paradigm. This paper is part of a set that analyses the final galaxy clustering dataset from BOSS.
Original languageEnglish
Pages (from-to)2370–2390
JournalMonthly Notices of the Royal Astronomical Society
Volume471
Issue number2
Early online date30 Jun 2017
DOIs
Publication statusPublished - Oct 2017

Keywords

  • astro-ph.CO

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