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The 3D Power Spectrum from Angular Clustering of Galaxies in Early SDSS Data
Preprint   Open access

The 3D Power Spectrum from Angular Clustering of Galaxies in Early SDSS Data

Scott Dodelson, Vijay K Narayanan, Max Tegmark, Ryan Scranton, Tamas Budavari, Andrew Connolly, Istvan Csabai, Daniel Eisenstein, Joshua A Frieman, James E Gunn, …
ArXiv.org
20 Jul 2001
DOI: https://doi.org/10.48550/arxiv.astro-ph/0107421
url
https://doi.org/10.48550/arxiv.astro-ph/0107421View
Preprint (Author's original)arXiv.org - Non-exclusive license to distribute,  Open

Abstract

Physics - Astrophysics of Galaxies Physics - Cosmology and Nongalactic Astrophysics Physics - Earth and Planetary Astrophysics Physics - High Energy Astrophysical Phenomena Physics - Instrumentation and Methods for Astrophysics Physics - Solar and Stellar Astrophysics
Astrophys.J.572:140-156,2001 Early photometric data from the Sloan Digital Sky Survey (SDSS) contain angular positions for 1.5 million galaxies. In companion papers, the angular correlation function $w(\theta)$ and 2D power spectrum $C_l$ of these galaxies are presented. Here we invert Limber's equation to extract the 3D power spectrum from the angular results. We accomplish this using an estimate of $dn/dz$, the redshift distribution of galaxies in four different magnitude slices in the SDSS photometric catalog. The resulting 3D power spectrum estimates from $w(\theta)$ and $C_l$ agree with each other and with previous estimates over a range in wavenumbers $0.03 < k/{\rm h Mpc}^{-1} < 1$. The galaxies in the faintest magnitude bin ($21 < \rstar < 22$, which have median redshift $z_m=0.43$) are less clustered than the galaxies in the brightest magnitude bin ($18 < \rstar < 19$ with $z_m=0.17$), especially on scales where nonlinearities are important. The derived power spectrum agrees with that of Szalay et al. (2001) who go directly from the raw data to a parametric estimate of the power spectrum. The strongest constraints on the shape parameter $\Gamma$ come from the faintest galaxies (in the magnitude bin $21 < \rstar < 22$), from which we infer $\Gamma = 0.14^{+0.11}_{-0.06}$ (95% C.L.).

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