Masking versus removing point sources in CMB data: the source corrected WMAP power spectrum from new extended catalogue

Abstract

In (Scodeller et al.) a new and extended point source catalogue obtained from the WMAP 7-year data was presented. It includes most of the sources included in the standard WMAP 7-year point source catalogues as well as a large number of new detections. Here we study the effects on the estimated CMB power spectrum when taking the newly detected point sources into consideration. We create point source masks for all the 2102 sources that we detected as well as a smaller one for the 665 sources detected in the Q, V and W bands. We also create WMAP7 maps with point sources subtracted in order to compare with the spectrum obtained with source masks. The extended point source masks and point source cleaned WMAP7 maps are made publicly available. Using the proper residual correction, we find that the CMB power spectrum obtained from the point source cleaned map without any source mask is fully consistent with the spectrum obtained from the masked map. We further find that the spectrum obtained masking all 2102 sources is consistent with the results obtained using the standard WMAP 7-year point source mask (KQ85y7). We also verify that the removal of point sources does not introduce any skewness.

26 pages and 11 figures; accepted version, published in ApJ

References in corpus (20)

• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Power Spectra and WMAP-Derived Parameters
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Angular Power Spectrum
• MASTER of the CMB Anisotropy Power Spectrum: A Fast Method for Statistical Analysis of Large and Complex CMB Data Sets
• The Microwave Anisotropy Probe (MAP) Mission
• Detection of non-Gaussianity in the WMAP 1-year data using spherical wavelets
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Galactic Foreground Emission
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Angular Power Spectra
• Predictions for high-frequency radio surveys of extragalactic sources
• Extragalactic Source Counts and Contributions to the Anisotropies of the Cosmic Microwave Background. Predictions for the Planck Surveyor mission
• Spherical Needlets for CMB Data Analysis
• High--frequency predictions for number counts and spectral properties of extragalactic radio sources. New evidences of a break at mm wavelengths in spectra of bright blazar sources
• Removing point sources from CMB maps
• Foreground Subtraction of Cosmic Microwave Background Maps using WI-FIT (Wavelet based hIgh resolution Fitting of Internal Templates)
• The effect of point sources on satellite observations of the cosmic microwave background
• The Planck Surveyor mission: astrophysical prospects
• Introducing Mexican needlets for CMB analysis: Issues for practical applications and comparison with standard needlets
• Detection of new point sources in WMAP 7 year data using internal templates and needlets
• A High-Accuracy Method for the Removal of Point Sources from Maps of the Cosmic Microwave Background

Cited by in corpus (3)

• Residual foreground contamination in the WMAP data and bias in non-Gaussianity estimation
• Sparse point-source removal for full-sky CMB experiments: application to WMAP 9-year data
• Mitigating point-source contamination in CMB polarization: a Generalized Point Spread Function fitting approach