Journal
ASTRONOMY & ASTROPHYSICS
Volume 552, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201220724
Keywords
cosmology: observations; dark energy; large-scale structure of Universe; cosmological parameters
Categories
Funding
- Alfred P. Sloan Foundation
- National Science Foundation
- US Department of Energy Office of Science
- Agence Nationale de la Recherche [ANR-08-BLAN-0222]
- European Union Seventh Framework Programme (FP7) [PIIF-GA-2011-301665]
- University of Arizona
- Brazilian Participation Group
- Brookhaven National Laboratory
- University of Cambridge
- Carnegie Mellon University
- University of Florida
- French Participation Group
- German Participation Group
- Harvard University
- Instituto de Astrofisica de Canarias
- Michigan State/Notre Dame/JINA Participation Group
- Johns Hopkins University
- Lawrence Berkeley National Laboratory
- Max Planck Institute for Astrophysics
- Max Planck Institute for Extraterrestrial Physics
- New Mexico State University
- New York University
- Ohio State University
- Pennsylvania State University
- University of Portsmouth
- Princeton University
- Spanish Participation Group
- University of Tokyo
- University of Utah
- Vanderbilt University
- University of Virginia
- University of Washington
- Yale University
- ICREA Funding Source: Custom
- STFC [ST/K00090X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K00090X/1] Funding Source: researchfish
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1202963] Funding Source: National Science Foundation
- Agence Nationale de la Recherche (ANR) [ANR-08-BLAN-0222] Funding Source: Agence Nationale de la Recherche (ANR)
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We report a detection of the baryon acoustic oscillation (BAO) feature in the three-dimensional correlation function of the transmitted flux fraction in the Ly alpha forest of high-redshift quasars. The study uses 48 640 quasars in the redshift range 2.1 <= z <= 3.5 from the Baryon Oscillation Spectroscopic Survey (BOSS) of the third generation of the Sloan Digital Sky Survey (SDSS-III). At a mean redshift z = 2.3, we measure the monopole and quadrupole components of the correlation function for separations in the range 20 h(-1) Mpc < r < 200 h(-1) Mpc. A peak in the correlation function is seen at a separation equal to (1.01 +/- 0.03) times the distance expected for the BAO peak within a concordance Lambda CDM cosmology. This first detection of the BAO peak at high redshift, when the universe was strongly matter dominated, results in constraints on the angular diameter distance D-A and the expansion rate H at z = 2.3 that, combined with priors on H-0 and the baryon density, require the existence of dark energy. Combined with constraints derived from cosmic microwave background observations, this result implies H(z = 2.3) = (224 +/- 8) km s(-1) Mpc(-1), indicating that the time derivative of the cosmological scale parameter (a) over dot = H(z = 2.3)/(1 + z) is significantly greater than that measured with BAO at z similar to 0.5. This demonstrates that the expansion was decelerating in the range 0.7 < z < 2.3, as expected from the matter domination during this epoch. Combined with measurements of H-0, one sees the pattern of deceleration followed by acceleration characteristic of a dark-energy dominated universe.
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