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Title:
Baryon acoustic oscillations in the Sloan Digital Sky Survey Data Release 7 galaxy sample
Authors:
Percival, Will J.; Reid, Beth A.; Eisenstein, Daniel J.; Bahcall, Neta A.; Budavari, Tamas; Frieman, Joshua A.; Fukugita, Masataka; Gunn, James E.; Ivezić, Željko; Knapp, Gillian R.; Kron, Richard G.; Loveday, Jon; Lupton, Robert H.; McKay, Timothy A.; Meiksin, Avery; Nichol, Robert C.; Pope, Adrian C.; Schlegel, David J.; Schneider, Donald P.; Spergel, David N.; Stoughton, Chris; Strauss, Michael A.; Szalay, Alexander S.; Tegmark, Max; Vogeley, Michael S.; Weinberg, David H.; York, Donald G.; Zehavi, Idit
Affiliation:
AA(Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama building, Portsmouth P01 3FX), AB(Institute of Space Sciences (CSIC-IEEC), UAB, Barcelona 08193, Spain; Institute for Sciences of the Cosmos (ICC), University of Barcelona, Barcelona 08028, Spain; Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA), AC(Steward Observatory, University of Arizona, 933 N. Cherry Ave., Tucson, AZ 85121, USA), AD(Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA), AE(Department of Physics and Astronomy, The Johns Hopkins University, 3701 San Martin Drive, Baltimore, MD 21218, USA), AF(Particle Astrophysics Center, Fermilab, PO Box 500, Batavia, IL 60510, USA; Kavli Institute for Cosmological Physics, Department of Astronomy & Astrophysics, University of Chicago, Chicago, IL 60637, USA), AG(Institute for Cosmic Ray Research, University of Tokyo, Kashiwa 277-8582, Japan), AH(Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA), AI(Department of Astronomy, University of Washington Box 351580, Seattle, WA 98195, USA), AJ(Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA), AK(Department of Astronomy and Astrophysics, The University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA), AL(Astronomy Centre, University of Sussex, Falmer, Brighton BN1 9QH), AM(Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA), AN(Departments of Physics and Astronomy, University of Michigan, Ann Arbor, MI 48109, USA), AO(SUPA; Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ), AP(Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama building, Portsmouth P01 3FX), AQ(Los Alamos National Laboratory, PO Box 1663, Los Alamos, NM 87545, USA), AR(Lawrence Berkeley National Lab, 1 Cyclotron Road, MS 50R5032, Berkeley, CA 94720, USA), AS(Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802, USA), AT(Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA; Princeton Center for Theoretical Science, Princeton University, Jadwin Hall, Princeton, NJ 08542, USA), AU(Fermilab, PO Box 500, Batavia, IL 60510, USA), AV(Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA), AW(Department of Physics and Astronomy, The Johns Hopkins University, 3701 San Martin Drive, Baltimore, MD 21218, USA), AX(Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA), AY(Department of Physics, Drexel University, Philadelphia, PA 19104, USA), AZ(Department of Astronomy, The Ohio State University, Columbus, OH 43210, USA), BA(Department of Astronomy and Astrophysics, The University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA; Enrico Fermi Institute, University of Chicago, Chicago, IL 60637, USA), BB(Department of Astronomy, Case Western Reserve University, Cleveland, OH 44106, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 401, Issue 4, pp. 2148-2168. (MNRAS Homepage)
Publication Date:
02/2010
Origin:
MNRAS
MNRAS Keywords:
cosmology: observations, distance scale, large-scale structure of Universe
Abstract Copyright:
(c) Journal compilation © 2010 RAS
DOI:
10.1111/j.1365-2966.2009.15812.x
Bibliographic Code:
2010MNRAS.401.2148P

Abstract

ABSTRACT The spectroscopic Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) galaxy sample represents the final set of galaxies observed using the original SDSS target selection criteria. We analyse the clustering of galaxies within this sample, including both the luminous red galaxy and main samples, and also include the 2-degree Field Galaxy Redshift Survey data. In total, this sample comprises 893319 galaxies over 9100deg2. Baryon acoustic oscillations (BAO) are observed in power spectra measured for different slices in redshift; this allows us to constrain the distance-redshift relation at multiple epochs. We achieve a distance measure at redshift z = 0.275, of rs(zd)/DV(0.275) = 0.1390 +/- 0.0037 (2.7 per cent accuracy), where rs(zd) is the comoving sound horizon at the baryon-drag epoch, DV(z) ≡ [(1 + z)2D2Acz/H(z)]1/3, DA(z) is the angular diameter distance and H(z) is the Hubble parameter. We find an almost independent constraint on the ratio of distances DV(0.35)/DV(0.2) = 1.736 +/- 0.065, which is consistent at the 1.1σ level with the best-fitting Λ cold dark matter model obtained when combining our z = 0.275 distance constraint with the Wilkinson Microwave Anisotropy Probe 5-year (WMAP5) data. The offset is similar to that found in previous analyses of the SDSS DR5 sample, but the discrepancy is now of lower significance, a change caused by a revised error analysis and a change in the methodology adopted, as well as the addition of more data. Using WMAP5 constraints on Ωbh2 and Ωch2, and combining our BAO distance measurements with those from the Union supernova sample, places a tight constraint on Ωm = 0.286 +/- 0.018 and H0 = 68.2 +/- 2.2kms-1Mpc-1 that is robust to allowing Ωk ≠ 0 and w ≠ -1. This result is independent of the behaviour of dark energy at redshifts greater than those probed by the BAO and supernova measurements. Combining these data sets with the full WMAP5 likelihood constraints provides tight constraints on both Ωk = -0.006 +/- 0.008 and w = -0.97 +/- 0.10 for a constant dark energy equation of state.
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