The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey : cosmological analysis of the DR12 galaxy sample
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We present cosmological results from the final galaxy clustering data set of the Baryon Oscillation Spectroscopic Survey, part of the Sloan Digital Sky Survey III. Our combined galaxy sample comprises 1.2 million massive galaxies over an effective area of 9329 deg2 and volume of 18.7 Gpc3, divided into three partially overlapping redshift slices centred at effective redshifts 0.38, 0.51, and 0.61. We measure the angular diameter distance DM and Hubble parameter H from the baryon acoustic oscillation (BAO) method, in combination with a cosmic microwave background prior on the sound horizon scale,. after applying reconstruction to reduce non-linear effects on the BAO feature. Using the anisotropic clustering of the pre-reconstruction density field, we measure the product DMH from the Alcock-Paczynski (AP) effect and the growth of structure, quantified by ƒσ8(z), from redshift-space distortions (RSD). We combine individual measurements presented in seven companion papers into a set of consensus values and likelihoods, obtaining constraints that are tighter and more robust than those from any one method; in particular, the AP measurement from sub-BAO scales sharpens constraints from post-reconstruction BAO by breaking degeneracy between DM and H. Combined with Planck 2015 cosmic microwave background measurements, our distance scale measurements simultaneously imply curvature ΩK = 0.0003 ± 0.0026 and a dark energy equation of state parameter w = −1.01 ± 0.06, in strong affirmation of the spatially flat cold dark matter model with a cosmological constant (ΛCDM). Our RSD measurements of ƒσ8, at 6 per cent precision, are similarly consistent with this model. When combined with supernova Ia data, we find H0 = 67.3 ± 1.0 km s−1 Mpc−1 even for our most general dark energy model, in tension with some direct measurements. Adding extra relativistic species as a degree of freedom loosens the constraint only slightly, to H0 = 67.8 ± 1.2 km s−1 Mpc−1. Assuming flat ΛCDM we find Ωm = 0.310 ± 0.005 and H0 = 67.6 ± 0.5 km s−1 Mpc−1, and we find a 95% upper limit of 0.16 eV/c2 on the neutrino mass sum.
Alam , S , Ata , M , Bailey , S , Beutler , F , Bizyaev , D , Blazek , J A , Bolton , A S , Brownstein , J R , Burden , A , Chuang , C-H , Comparat , J , Cuesta , A J , Dawson , K S , Eisenstein , D J , Escoffier , S , Gil-Marín , H , Grieb , J N , Hand , N , Ho , S , Kinemuchi , K , Kirkby , D , Kitaura , F , Malanushenko , E , Malanushenko , V , Maraston , C , McBride , C K , Nichol , R C , Olmstead , M D , Oravetz , D , Padmanabhan , N , Palanque-Delabrouille , N , Pan , K , Pellejero-Ibanez , M , Percival , W J , Petitjean , P , Prada , F , Price-Whelan , A M , Reid , B A , Rodríguez-Torres , S A , Roe , N A , Ross , A J , Ross , N P , Rossi , G , Rubiño-Martín , J A , Saito , S , Salazar-Albornoz , S , Samushia , L , Sánchez , A G , Satpathy , S , Schlegel , D J , Schneider , D P , Scóccola , C G , Seo , H-J , Sheldon , E S , Simmons , A , Slosar , A , Strauss , M A , Swanson , M E C , Thomas , D , Tinker , J L , Tojeiro , R , Vargas Magaña , M , Vazquez , J A , Verde , L , Wake , D A , Wang , Y , Weinberg , D H , White , M , Wood-Vasey , W M , Yèche , C , Zehavi , I , Zhai , Z & Zhao , G-B 2017 , ' The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey : cosmological analysis of the DR12 galaxy sample ' Monthly Notices of the Royal Astronomical Society , vol 470 , no. 3 , pp. 2617-2652 . DOI: 10.1093/mnras/stx721
Monthly Notices of the Royal Astronomical Society
© 2017, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at academic.oup.com/mnras / https://doi.org/10.1093/mnras/stx721
RT acknowledges support from the Science and Technology Facilities Council via an Ernest Rutherford Fellowship (grant number ST/K004719/1).
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