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Measurements of H(z) and D_A(z) from the Two-Dimensional Two-Point Correlation Function of Sloan Digital Sky Survey Luminous Red Galaxies | | Chia-Hsun Chuang
; Yun Wang
; | | Date: |
10 Feb 2011 | | Abstract: | We present a method for measuring the Hubble parameter, H(z), and angular
diameter distance, D_A(z), from the two-dimensional two-point correlation
function, and validate it using LasDamas mock galaxy catalogs. We find that
volume-limited galaxy samples are required to derive unbiased estimates.
Applying our method to the volume-limited sample of luminous red galaxies
(LRGs) from the Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7), we find
H(z=0.26)=H(0.26)=78.2_{-4.3}^{+4.2} km s^{-1} Mpc^{-1},
D_A(z=0.26)=D_A(0.26)=916_{-45}^{+46} Mpc, linear redshift space distortion
parameter eta=0.495_{-0.084}^{+0.086}, and matter density Omega_m
h^2=0.114_{-0.015}^{+0.014}, without assuming a dark energy model or a flat
Universe. We give the mean and covariance matrix of {H(0.26), D_A(0.26), eta,
Omega_m h^2, Omega_b h^2, n_s} derived from the SDSS DR7 LRGs; these can be
used to combine with cosmic microwave background and any other cosmological
data sets to constrain dark energy. Our results represent the first
measurements of H(z) and D_A(z) from galaxy clustering data. Our work has
significant implications for future surveys in establishing the feasibility of
measuring both H(z) and D_A(z) from galaxy clustering data, and the requirement
of volume-limited galaxy samples in deriving unbiased estimates. | | Source: | arXiv, 1102.2251 | | Services: | Forum | Review | PDF | Favorites | |
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