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The Angular Power Spectrum of Galaxies from Early SDSS Data
Preprint   Open access

The Angular Power Spectrum of Galaxies from Early SDSS Data

Max Tegmark, Scott Dodelson, Daniel Eisenstein, Vijay Narayanan, Roman Scoccimarro, Ryan Scranton, Michael Strauss, Andrew Connolly, Joshua A Frieman, James E Gunn, …
ArXiv.org
20 Jul 2001
DOI: https://doi.org/10.48550/arxiv.astro-ph/0107418
url
https://doi.org/10.48550/arxiv.astro-ph/0107418View
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.571:191-205,2002 We compute the angular power spectrum C_l from 1.5 million galaxies in early SDSS data on large angular scales, l<600. The data set covers about 160 square degrees, with a characteristic depth of order 1 Gpc/h in the faintest (21<r<22) of our four magnitude bins. Cosmological interpretations of these results are presented in a companion paper by Dodelson et al (2001). The data in all four magnitude bins are consistent with a simple flat ``concordance'' model with nonlinear evolution and linear bias factors of order unity. Nonlinear evolution is particularly evident for the brightest galaxies. A series of tests suggest that systematic errors related to seeing, reddening, etc., are negligible, which bodes well for the sixtyfold larger sample that the SDSS is currently collecting. Uncorrelated error bars and well-behaved window functions make our measurements a convenient starting point for cosmological model fitting.

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