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Chuang, Chia-Hsun; Pellejero-Ibanez, Marcos; Rodriguez-Torres, Sergio; Ross, Ashley J.; Zhao, Gong-bo; Wang, Yuting; Cuesta, Antonio J.; Rubino-Martin, J. A.; Prada, Francisco; Alam, Shadab; Beutler, Florian; Eisenstein, Daniel J.; Gil-Marin, Hector; Grieb, Jan Niklas; Ho, Shirley; Kitaura, Francisco-Shu; Percival, Will J.; Rossi, Graziano; Salazar-Albornoz, Salvador; Samushia, Lado; Sanchez, Ariel G.; Satpathy, Siddharth; Slosar, Anze; Thomas, Daniel; Tinker, Jeremy L.; Tojeiro, Rita; Vargas-Magana, Mariana; Vazquez, Jose A.; Brownstein, Joel R.; Nichol, Robert C.; Olmstead, Matthew D. (2017): The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: single-probe measurements from DR12 galaxy clustering - towards an accurate model. In: Monthly Notices of the Royal Astronomical Society, Vol. 471, No. 2: pp. 2370-2390
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Abstract

We analyse the broad-range shape of the monopole and quadrupole correlation functions of the Baryon Oscillation Spectroscopic Survey Data Release 12 (DR12) CMASS and LOWZ galaxy sample to obtain constraints on the Hubble expansion rate H(z), the angular-diameter distance D-A(z), the normalized growth rate f(z) sigma(8)(z) and the physical matter density Omega(m) h(2). 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 marginalize 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. We develop a new methodology to speed up the analysis. Using the range 40 h(-1) Mpc < s < 180 h(-1) Mpc, we obtain {DA(z) r(s,fid)/ r(s) (Mpc), H(z) r(s)/r(s),(fid) km s(-1) Mpc(-1), f(z)sigma 8(z)Omega(m)h(2)} = {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) = 147.66 Mpc for the fiducial cosmology used in this study. Combining our measurements with Planck data, we obtain Omega(m) = 0.306 +/- 0.009, H-0 = 67.9 +/- 0.7 kms(-1) Mpc(-1) and sigma(8) = 0.815 +/- 0.009 assuming Lambda cold dark matter (CDM);Omega(k) = 0.000 +/- 0.003 and w= -1.02 +/- 0.08 assuming owCDM. Our results show no tension with the flat Lambda CDM cosmological paradigm. This paper is part of a set that analyses the final galaxy clustering data set from Baryon Oscillation Spectroscopic Survey.