The Angular Power Spectrum of Galaxies from Early SDSS Data
Abstract
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.
Keywords
Cite
@article{arxiv.astro-ph/0107418,
title = {The Angular Power Spectrum of Galaxies from Early SDSS Data},
author = {SDSS Collaboration and Max Tegmark and Scott Dodelson and Daniel Eisenstein and Vijay Narayanan and Roman Scoccimarro and Ryan Scranton and Michael Strauss and Andrew Connolly and Joshua A. Frieman and James E. Gunn and Lam Hui and Bhuvnesh Jain and David Johnston and Stephen Kent and Jon Loveday and Robert C. Nichol and Liam O'Connell and Ravi K. Sheth and Albert Stebbins and Alexander S. Szalay and Istvan Szapudi and Michael S. Vogeley and Idit Zehavi},
journal= {arXiv preprint arXiv:astro-ph/0107418},
year = {2009}
}
Comments
Replaced to match accepted ApJ version (14 pages). Data, window functions etc available at http://www.hep.upenn.edu/~max/sdss.html or from max@physics.upenn.edu