Measuring D_A and H at z=0.35 from the SDSS DR7 LRGs using baryon acoustic oscillations

Citation:

Xu X, Cuesta AJ, Padmanabhan N, Eisenstein DJ, McBride CK. Measuring D_A and H at z=0.35 from the SDSS DR7 LRGs using baryon acoustic oscillations. ArXiv e-prints. 2012;1206 :6732.

Abstract:

We present measurements of the angular diameter distance D_A(z) and theHubble parameter H(z) at z=0.35 using the anisotropy of the baryonacoustic oscillation (BAO) signal measured in the galaxy clusteringdistribution of the Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7)Luminous Red Galaxies (LRG) sample. Our work is the first to applydensity-field reconstruction to an anisotropic analysis of the acousticpeak. Reconstruction partially removes the effects of non-linearevolution and redshift-space distortions in order to sharpen theacoustic signal. We present the theoretical framework behind theanisotropic BAO signal and give a detailed account of the fitting modelwe use to extract this signal from the data. Our method focuses only onthe acoustic peak anisotropy, rather than the more model-dependentanisotropic information from the broadband power. We test the robustnessof our analysis methods on 160 LasDamas DR7 mock catalogues and find

Notes:

29 pages, 21 figures, submitted to MNRAS

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