Cosmological parameters from eigenmode analysis of sloan digital sky survey galaxy redshifts

Adrian C. Pope, Takahiko Matsubara, Alexander S. Szalay, Michael R. Blanton, Daniel J. Eisenstein, Jim Gray, Bhuvnesh Jain, Neta A. Bahcall, Jon Brinkmann, Tamas Budavari, Andrew J. Connolly, Joshua A. Frieman, James E. Gunn, David Johnston, Stephen M. Kent, Robert H. Lupton, Avery Meiksin, Robert C. Nichol, Donald P. Schneider, Ryan ScrantonMichael A. Strauss, Istvan Szapudi, Max Tegmark, Michael S. Vogeley, David H. Weinberg, Idit Zehavi

    Research output: Contribution to journalArticlepeer-review


    We present estimates of cosmological parameters from the application of the Karhunen-Loève transform to the analysis of the three-dimensional power spectrum of density fluctuations using Sloan Digital Sky Survey galaxy redshifts. We use Ωmh and fb = Ωb/ Ωm to describe the shape of the power spectrum, σ8gL for the (linearly extrapolated) normalization, and β to parameterize linear theory redshift-space distortions. On scales k ≲ 0.16 h Mpc-1, our maximum likelihood values are Ωmh = 0.264 ± 0.043, fb = 0.286 ± 0.065, σ8gL = 0.966 ± 0.048, and β= 0.45 ± 0.12. When we take a prior on Ωb from the Wilkinson Micro-wave Anisotropy Probe (WMAP), we find Ωmh = 0.207 ± 0.030, which is in excellent agreement with WMAP and the Two-Degree Field. This indicates that we have reasonably measured the gross shape of the power spectrum, but we have difficulty breaking the degeneracy between Ωmh and fb, because the baryon oscillations are not resolved in the current spectroscopic survey window function.

    Original languageEnglish (US)
    Pages (from-to)655-660
    Number of pages6
    JournalAstrophysical Journal
    Issue number2 I
    StatePublished - Jun 1 2004


    • Cosmological parameters
    • Cosmology: theory
    • Galaxies: distances and redshifts
    • Large-scale structure of universe
    • Methods: statistical

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science


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