期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 423, 期 2, 页码 1474-1484出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2012.20971.x
关键词
cosmology: observations; distance scale; large-scale structure of Universe
资金
- DOE [DE-FG02-04ER41305]
- Alfred P. Sloan Foundation
- National Aeronautics and Space Administration
- National Science Fondation
- U.S. Department of Energy
- Japanese Monbukagakusho
- Max Planck Society
- University of Chicago
- Fermilab
- Institute for Advanced Study
- Japan Participation Group
- Johns Hopkins University
- Los Alamos National Laboratory
- Max-Planck-Institute for Astronomy (MPIA)
- Max-Planck-Institute for Astrophysics (MPA)
- New Mexico State University
- University of Pittsburgh
- Princeton University
- United States Naval Observatory
- University of Washington
We measure the effective distance to z= 0.35, DV(0.35) from the overall shape of the spherically averaged two-point correlation function (2PCF) of the Sloan Digital Sky Survey (SDSS) data release 7 luminous red galaxy sample. We find DV(0.35)=1428+74-73 without assuming a dark energy model or a flat Universe. We find that the derived measurement of (the ratio of the sound horizon at the drag epoch to the effective distance to z= 0.35) is more tightly constrained and more robust with respect to possible systematic effects. It is also nearly uncorrelated with . Combining our results with the cosmic microwave background and supernova data, we obtain and w=-1.010+0.046-0.045 (assuming a constant dark energy equation of state). We use LasDamas SDSS mock catalogues to compute the covariance matrix of the correlation function and investigate the use of lognormal catalogues as an alternative. We find that the input correlation function can be accurately recovered from lognormal catalogues, although they give larger errors on all scales (especially on small scales) compared to the mock catalogues derived from cosmological N-body simulations.
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