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Title: The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: baryon acoustic oscillations in the Data Releases 10 and 11 Galaxy samples
Author: Anderson, Lauren
Aubourg, Eric
Bailey, Stephen
Beutler, Florian
Bhardwaj, Vaishali
Blanton, Michael R.
Bolton, Adam S.
Brinkmann, Jon
Brownstein, Joel R.
Burden, Angela
Chuang, Chia-Hsun
Cuesta, Antonio J.
Dawson, Kyle S.
Eisenstein, Daniel J.
Escoffier, Stephanie
Gunn, James E.
Guo, H.
Ho, Shirley
Honscheid, Klaus
Howlett, Cullan
Kirkby, David
Lupton, Robert H.
Manera, Marc
Maraston, Claudia
McBride, Cameron K.
Mena, O.
Montesano, Francesco
Nichol, Robert C.
Nuza, Sebastián E.
Olmstead, Matthew D.
Padmanabhan, Nikhil
Palanque-Delabrouille, N.
Parejko, John
Percival, W.J.
Petitjean, Patrick
Prada, Francisco
Price-Whelan, Adrian M.
Reid, Beth
Roe, Natalie A.
Verde, Licia
Keywords: Cosmologia
Observacions astronòmiques
Espectroscòpia de microones
Astronomical observations
Microwave spectroscopy
Issue Date: 22-Apr-2014
Publisher: Royal Astronomical Society
Abstract: We present a one per cent measurement of the cosmic distance scale from the detections of the baryon acoustic oscillations (BAO) in the clustering of galaxies from the Baryon Oscillation Spectroscopic Survey, which is part of the Sloan Digital Sky Survey III. Our results come from the Data Release 11 (DR11) sample, containing nearly one million galaxies and covering approximately 8500 square degrees and the redshift range 0.2 < z < 0.7. We also compare these results with those from the publicly released DR9 and DR10 samples. Assuming a concordance Lambda cold dark matter (LambdaCDM) cosmological model, the DR11 sample covers a volume of 13 Gpc3 and is the largest region of the Universe ever surveyed at this density. We measure the correlation function and power spectrum, including density-field reconstruction of the BAO feature. The acoustic features are detected at a significance of over 7sigma in both the correlation function and power spectrum. Fitting for the position of the acoustic features measures the distance relative to the sound horizon at the drag epoch, rd, which has a value of rd,fid = 149.28 Mpc in our fiducial cosmology. We find DV = (1264 ± 25 Mpc)(rd/rd,fid) at z = 0.32 and DV = (2056 ± 20 Mpc)(rd/rd,fid) at z = 0.57. At 1.0 per cent, this latter measure is the most precise distance constraint ever obtained from a galaxy survey. Separating the clustering along and transverse to the line of sight yields measurements at z = 0.57 of DA = (1421 ± 20 Mpc)(rd/rd,fid) and H = (96.8 ± 3.4 km s-1 Mpc-1)(rd,fid/rd). Our measurements of the distance scale are in good agreement with previous BAO measurements and with the predictions from cosmic microwave background data for a spatially flat CDM model with a cosmological constant.
Note: Reproducció del document publicat a:
It is part of: Monthly Notices of the Royal Astronomical Society, 2014, vol. 441, num. 1, p. 24-62
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ISSN: 0035-8711
Appears in Collections:Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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