2013MNRAS.428.3487H

We use a quadratic estimator with Karhunen-Loéve (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 an ∼ 53.7 square degree area out to ℓ = 1600 to determine the SDSS DR7 angular power spectrum to high multipoles. We perform a χ2 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-fitting cosmological parameters of Ωm = 0.267±0.038 and Ωb = 0.045 ± 0.012. We find an overall linear bias of b = 1.075±0.056, an early-type bias of be = 1.727±0.065 and a late-type bias of bl = 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).