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Title: The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: baryon acoustic oscillations in the Data Release 9 spectroscopic galaxy sample
Author: Anderson, Lauren
Aubourg, Eric
Bailey, Stephen
Bizyaev, Dimitry
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, O.
Montesano, Francesco
Muna, D.
Nichol, Robert C.
Nuza, Sebastián E.
Olmstead, Matthew D.
Verde, Licia
Keywords: Energia fosca (Astronomia)
Mesurament de les distàncies
Observacions astronòmiques
Dark energy (Astronomy)
Measurement of distances
Astronomical observations
Issue Date: 29-Jan-2013
Publisher: Royal Astronomical Society
Abstract: 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.
Note: Reproducció del document publicat a:
It is part of: Monthly Notices of the Royal Astronomical Society, 2013, vol. 427, num. 4, p. 3435-3467
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ISSN: 0035-8711
Appears in Collections:Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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