The SDSS DR7 Galaxy Angular Power Spectrum: Volume-Limits and Galaxy Morphology
arXiv:1211.1420 · doi:10.1093/mnras/sts290
Abstract
We use a quadratic estimator with KL-compression to calculate the angular power spectrum of a volume-limited Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) galaxy sample out to l = 200. We also determine the angular power spectrum of selected subsamples with photometric redshifts z < 0.3 and 0.3 < z < 0.4 to examine the possible evolution of the angular power spectrum, as well as early-type and late-type galaxy subsamples to examine the relative linear bias. In addition, we calculate the angular power spectrum of the SDSS DR7 main galaxy sample in a ~ 53.7 square degree area out to l = 1600 to determine the SDSS DR7 angular power spectrum to high multipoles. We perform a χ^2 fit to compare the resulting angular power spectra to theoretical nonlinear angular power spectra to extract cosmological parameters and the linear bias. We find the best-fit cosmological parameters of Ω_m = 0.267 +- 0.038 and Ω_b = 0.045 +- 0.012. We find an overall linear bias of b = 1.075 +- 0.056, an early-type bias of b_e = 1.727 +- 0.065, and a late-type bias of b_l = 1.256 +- 0.051. Finally, we present evidence of a selective misclassification of late-type galaxies as stars by the SDSS photometric data reduction pipeline in areas of high stellar density (e.g., at low Galactic latitudes).
arXiv comment11 pages, 12 figures, accepted for publication in MNRAS
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