Correlations from Galactic foregrounds in the 1-year Wilkinson Microwave Anisotropy Probe WMAP data

Abstract

We study a specific correlation in spherical harmonic multipole domain for cosmic microwave background (CMB) analysis. This group of correlation between Δl=4n, n=1,2... is caused by symmetric signal in the Galactic coordinate system. An estimator targeting such correlation therefore helps remove the localized bright point-like sources in the Galactic plane and the strong diffused component down to the CMB level. We use 3 toy models to illustrate the significance of these correlations and apply this estimator on some derived CMB maps with foreground residuals. In addition, we show that our proposed estimator significantly damp the phase correlations caused by Galactic foregrounds. This investigation provides the understanding of mode correlations caused by Galactic foregrounds, which is useful for paving the way for foreground cleaning methods for the CMB.

References in corpus (21)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Foreground Emission
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Angular Power Spectrum
• A high resolution foreground cleaned CMB map from WMAP
• The Microwave Anisotropy Probe (MAP) Mission
• Is the low-l microwave background cosmic?
• A method for subtracting foregrounds from multi-frequency CMB sky maps
• On Foreground Removal from the Wilkinson Microwave Anisotropy Probe Data by an Internal Linear Combination Method: Limitations and Implications
• Non-Gaussianity of the derived maps from the first-year WMAP data
• Gauss--Legendre Sky Pixelization (GLESP) for CMB maps
• Removing point sources from CMB maps
• Phase Correlations in Cosmic Microwave Background Temperature Maps
• Phase Information and the Evolution of Cosmological Density Perturbations
• Primordial magnetic field and non-Gaussianity of the 1-year Wilkinson Microwave Anisotropy Probe (WMAP) data
• Phase cross-correlation of the WMAP ILC map and foregrounds
• Return mapping of phases and the analysis of the gravitational clustering hierarchy
• Phase Mapping as a Powerful Diagnostic of Primordial Non-Gaussianity
• Cross-correlation of the CMB and foregrounds phases derived from the WMAP data
• The Importance of Fourier Phases for the Morphology of Gravitational Clustering
• An adaptive filter for the PLANCK Compact Source Catalogue construction
• Auto and cross correlation of phases of the whole-sky CMB and foreground maps from the 1-year WMAP data

Cited by in corpus (10)

• Imprints of Relic Gravitational Waves in Cosmic Microwave Background Radiation
• Tests and problems of the standard model in Cosmology
• Cleaned Three-Year WMAP CMB Map: Magnitude of the Quadrupole and Alignment of Large Scale Modes
• The impact of Galactic synchrotron emission on CMB anisotropy measurements. I. Angular power spectrum analysis of total intensity all-sky surveys
• Testing Gaussian random hypothesis with the cosmic microwave background temperature anisotropies in the three-year WMAP data
• Genus Topology of the Cosmic Microwave Background from the WMAP 3-Year Data
• The One-dimensional Fourier Representation and Large Angular Scale Foreground Contamination in the 3-year Wilkinson Microwave Anisotropy Probe data
• Peculiarities of phases of the WMAP quadrupole
• Some doubts on the validity of the foreground Galactic contribution subtraction from microwave anisotropies
• Symmetry of the CMB sky as a new test of its statistical isotropy. Non Cosmological Octupole?