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25 April 2024

» arxiv » astro-ph/0401249

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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 Scranton ; Michael A. Strauss ; Istvan Szapudi ; Max Tegmark ; Michael S. Vogeley ; David H. Weinberg ; Idit Zehavi ; for the SDSS Collaboration ;
Date:	13 Dec 2003
Journal:	Astrophys.J. 607 (2004) 655-660
Subject:	astro-ph
Abstract:	We present estimates of cosmological parameters from the application of the Karhunen-Loeve transform to the analysis of the 3D power spectrum of density fluctuations using Sloan Digital Sky Survey galaxy redshifts. We use Omega_mh and f_b = Omega_b/Omega_m to describe the shape of the power spectrum, sigma8 for the (linearly extrapolated) normalization, and beta to parametrize linear theory redshift space distortions. On scales k < 0.16 h/Mpc, our maximum likelihood values are Omega_mh = 0.264 +/-0.043, f_b = 0.286 +/- 0.065, sigma8 = 0.966 +/- 0.048, and beta = 0.45 +/- 0.12. When we take a prior on Omega_b from WMAP, we find Omega_mh = 0.207 +/- 0.030, which is in excellent agreement with WMAP and 2dF. This indicates that we have reasonably measured the gross shape of the power spectrum but we have difficulty breaking the degeneracy between Omega_mh and f_b because the baryon oscillations are not resolved in the current spectroscopic survey window function.
Source:	arXiv, astro-ph/0401249
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