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The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: baryon acoustic oscillations in the Data Release 9 spectroscopic galaxy sample Anderson, Lauren Aubourg, Eric Bailey, Stephen Bizyaev, Dmitry Blanton, Michael R. Bolton, Adam S. Brinkmann, Jon Brownstein, Joel R. Burden, Angela Cuesta, Antonio J. Da Costa, Luiz A. N. Dawson, Kyle S. Putter, Roland de Eisenstein, Daniel J. Gunn, James E. Guo, Hong Hamilton, Jean-Christophe Harding, Paul Ho, Shirley Honscheid, Klaus Kazin, Eyal A. Kirkby, David Kneib, Jean-Paul Labatie, Antoine Loomis, Craig Lupton, Robert H. Malanushenko, Elena Malanushenko, Viktor Mandelbaum, Rachel Manera, Marc Maraston, Claudia McBride, Cameron K. Mehta, Kushal T. Mena, Olga Montesano, Francesco Muna, Demetri Nichol, Robert C. Nuza, Sebastián E. Olmstead, Matthew D. O Verde, Licia Energia fosca (Astronomia) Cosmologia Mesurament de les distàncies Astrofísica Observacions astronòmiques Dark energy (Astronomy) Cosmology Measurement of distances Astrophysics Astronomical observations We present measurements of galaxy clustering from the Baryon Oscillation Spectroscopic Survey (BOSS), which is part of the Sloan Digital Sky Survey III (SDSS-III). These use the Data Release 9 (DR9) CMASS sample, which contains 264 283 massive galaxies covering 3275 square degrees with an effective redshift z = 0.57 and redshift range 0.43 < z < 0.7. Assuming a concordance LambdaCDM cosmological model, this sample covers an effective volume of 2.2 Gpc3, and represents the largest sample of the Universe ever surveyed at this density, n¯≈3×10-4 h-3 Mpc 3. We measure the angle-averaged galaxy correlation function and power spectrum, including density-field reconstruction of the baryon acoustic oscillation (BAO) feature. The acoustic features are detected at a significance of 5sigma in both the correlation function and power spectrum. Combining with the SDSS-II luminous red galaxy sample, the detection significance increases to 6.7sigma. Fitting for the position of the acoustic features measures the distance to z = 0.57 relative to the sound horizon DV/rs = 13.67 ± 0.22 at z = 0.57. Assuming a fiducial sound horizon of 153.19 Mpc, which matches cosmic microwave background constraints, this corresponds to a distance DV (z = 0.57) = 2094 ± 34 Mpc. At 1.7 per cent, this is the most precise distance constraint ever obtained from a galaxy survey. We place this result alongside previous BAO measurements in a cosmological distance ladder and find excellent agreement with the current supernova measurements. We use these distance measurements to constrain various cosmological models, finding continuing support for a flat Universe with a cosmological constant. 2017-02-17T08:45:49Z 2017-02-17T08:45:49Z 2013-01-29 2017-02-16T16:05:38Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.1111/j.1365-2966.2012.22066.x Monthly Notices of the Royal Astronomical Society, 2013, vol. 427, num. 4, p. 3435-3467 https://doi.org/10.1111/j.1365-2966.2012.22066.x (c) Anderson, Lauren et al., 2013 info:eu-repo/semantics/openAccess Royal Astronomical Society Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))