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29 March 2024
 
  » arxiv » astro-ph/0608632

 Article overview


Cosmological Constraints from the SDSS Luminous Red Galaxies
M Tegmark ; D Eisenstein ; M Strauss ; D Weinberg ; M Blanton ; J Frieman ; M Fukugita ; J Gunn ; A Hamilton ; G Knapp ; R Nichol ; J Ostriker ; N Padmanabhan ; W Percival ; D Schlegel ; D Schneider ; R Scoccimarro ; U Seljak ; H Seo ; M Swanson ; A Szalay ; M Vogeley ; J Yoo ; I Zehavi ; K Abazajian ; S Anderson ; J Annis ; N Bahcall ; B Bassett ; A Berlind ; J Brinkmann ; T Budavari ; F Castander ; A Connolly ; I Csabai ; M Doi ; D Finkbeiner ; B Gillespie ; K Glazebrook ; G Hennessy ; D Hogg ; Z Ivezic ; B Jain ; D Johnston ; S Kent ; D Lamb ; B Lee ; H Lin ; J Loveday ; R Lupton ; J Munn ; K Pan ; C Park ; J Peoples ; J Pier ; A Pope ; M Richmond ; C Rockosi ; R Scranton ; R Sheth ; A Stebbins ; C Stoughton ; I Szapudi ; D Tucker ; D Vanden Berk ; B Yanny ; D York ;
Date 29 Aug 2006
AbstractWe measure the large-scale real-space power spectrum P(k) using luminous red galaxies (LRGs) in the Sloan Digital Sky Survey (SDSS) and use this measurement to sharpen constraints on cosmological parameters from the Wilkinson Microwave Anisotropy Probe (WMAP). We employ a matrix-based power spectrum estimation method using Pseudo-Karhunen-Loeve eigenmodes, producing uncorrelated minimum-variance measurements in 20 k-bands of both the clustering power and its anisotropy due to redshift-space distortions, with narrow and well-behaved window functions in the range 0.01h/Mpc < k < 0.2h/Mpc. Our results provide a striking confirmation of the predicted large-scale LCDM power spectrum. Combining only SDSS LRG and WMAP data places robust constraints on many cosmological parameters that complement prior analyses of multiple data sets. For flat LCDM models, our LRG measurements complement WMAP by sharpening the constraints on the matter density, the neutrino density and the tensor amplitude by about a factor of two, giving Omega_m=0.24+-0.02 (1 sigma), sum m_nu < 0.9 eV (95%) and r<0.3 (95%). Baryon oscillations are clearly detected and provide a robust measurement of the comoving distance to the median survey redshift z=0.35 independent of curvature and dark energy properties. For LCDM, our power spectrum measurement improves the evidence for spatial flatness, sharpening the curvature constraint Omega=1.05+-0.05 from WMAP alone to Omega_tot=1.003+-0.010. All these constraints are essentially independent of scales k>0.1h/Mpc and associated nonlinear complications, yet agree well with more aggressive analyses where nonlinear modeling is crucial. (Abridged)
Source arXiv, astro-ph/0608632
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