Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 419, Issue 2, Pages 1689-1694Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2011.19832.x
Keywords
methods: data analysis; cosmological parameters; dark energy; large-scale structure of Universe
Categories
Funding
- Alfred P. Sloan Foundation
- National Science Foundation
- US Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society and the Higher Education Funding Council for England
- American Museum of Natural History
- Astrophysical Institute Potsdam
- University of Basel
- University of Cambridge
- Case Western Reserve University
- University of Chicago
- Drexel University
- Fermilab
- Institute for Advanced Study
- Japan Participation Group
- Johns Hopkins University
- Joint Institute for Nuclear Astrophysics
- Kavli Institute for Particle Astrophysics and Cosmology
- Korean Scientist Group
- Chinese Academy of Sciences (LAMOST)
- Los Alamos National Laboratory
- Max-Planck-Institute for Astronomy (MPIA)
- Max-Planck-Institute for Astrophysics (MPA)
- New Mexico State University
- Ohio State University
- University of Pittsburgh
- University of Portsmouth
- Princeton University
- United States Naval Observatory
- University of Washington
- Spanish Ministry of Science and Innovation (MICINN) [AYA2009-13936-C06-01, AYA2009-13936-C06-03, AYA2009-13936-C06-04]
- Consolider Ingenio-2010 programme [CSD2007-00060]
- European Commissions Marie Curie Initial Training Network CosmoComp [PITN-GA-2009-238356]
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A new determination of the sound horizon scale in angular coordinates is presented. It makes use of similar to 0.6 x 106 luminous red galaxies, selected from the Sloan Digital Sky Survey imaging data, with photometric redshifts. The analysis covers a redshift interval that goes from z= 0.5 to 0.6. We find evidence of the baryon acoustic oscillation (BAO) signal at the similar to 2.3s confidence level, with a value of 0BAO(z= 0.55) = (390 +/- 038), including systematic errors. To our understanding, this is the first direct measurement of the angular BAO scale in the galaxy distribution and it is in agreement with previous BAO measurements. We also show how radial determinations of the BAO scale can break the degeneracy in the measurement of cosmological parameters when they are combined with BAO angular measurements. The result is also in good agreement with the 7-year Wilkinson Microscopy Anisotropy Probe (WMAP7) best-fitting cosmology. We obtain a value of w0=-1.03 +/- 0.16 for the equation of state parameter of the dark energy, or OM= 0.26 +/- 0.04 for the matter density, when the other parameters are fixed. We have also tested the sensitivity of current BAO measurements to a time-varying dark energy equation of state, finding wa= 0.06 +/- 0.22 if we fix all the other parameters to the WMAP7 best-fitting cosmology.
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