Degree-scale anomalies in the CMB: localizing the first peak dip to a small patch of the north ecliptic sky
arXiv:1005.5389 · doi:10.1103/PhysRevD.83.083525
Abstract
Noticeable deviations from the prediction of the fiducial LCDM cosmology are found in the angular power spectrum of the CMB. Besides large-angle anomalies, the WMAP 1st year data revealed a dip in the power spectrum at l \sim 200, which seemed to disappear in the 3rd year and subsequent angular power spectra. Using the WMAP 1st, 3rd, and 5th year data as well as the 5 year coadded data, we study the intensity and spatial distribution of this feature in order to unveil its origin and its implications for the cosmological parameters. We show that in all WMAP data releases there is a substantial suppression of the first Doppler peak in a region near the north ecliptic pole.
8 pages, submitted to Phys. Rev. D
References in corpus (8)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- Three-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Temperature Analysis
- Hemispherical power asymmetry in the three-year Wilkinson Microwave Anisotropy Probe sky maps
- The Uncorrelated Universe: Statistical Anisotropy and the Vanishing Angular Correlation Function in WMAP Years 1-3
- Detection of primordial non-Gaussianity (fNL) in the WMAP 3-year data at above 99.5% confidence
- Optimal limits on f_{NL}^{local} from WMAP 5-year data
- Correlated isocurvature perturbations from mixed inflaton-curvaton decay
- A model-independent test for scale-dependent non-Gaussianities in the CMB