Non-Gaussian foreground residuals of the WMAP first-year maps

  title={Non-Gaussian foreground residuals of the WMAP first-year maps},
  author={Jo{\~a}o R. Medeiros and Carlo R. Contaldi},
  journal={Monthly Notices of the Royal Astronomical Society},
  • J. Medeiros, C. Contaldi
  • Published 30 October 2005
  • Environmental Science
  • Monthly Notices of the Royal Astronomical Society
We investigate the effect of foreground residuals in the WMAP (Wilkinson Microwave Anisotropy Probe) data by adding foreground contamination to Gaussian ensembles of cosmic microwave background (CMB) signal and noise maps. We evaluate a set of non-Gaussian estimators on the contaminated ensembles to determine with what accuracy any residual in the data can be constrained using higher-order statistics. We apply the estimators to the raw and cleaned Q-, V- and W-band first-year maps. The… 

Figures and Tables from this paper

Principal components of CMB non-Gaussianity

The skew-spectrum statistic introduced by Munshi & Heavens (2010) has recently been used in studies of non-Gaussianity from diverse cosmological data sets including the detection of primary and

New approaches to probing Minkowski functionals

We generalize the concept of the ordinary skew-spectrum to probe the effect of non-Gaussianity on the morphology of cosmic microwave background (CMB) maps in several domains: in real space (where

Non-Gaussianity in large-scale structure and Minkowski functionals

Minkowski functionals (MFs) are topological statistics that have become one of many standard tools used for investigating the statistical properties of cosmological random fields. They have found

From weak lensing to non-Gaussianity via Minkowski functionals

We present a new harmonic-domain-based approach for extracting morphological information, in the form of Minkowski functionals (MFs), from weak-lensing convergence maps. Using a perturbative

Primordial non-Gaussianity from a joint analysis of the cosmic microwave background temperature and polarization

We explore a systematic approach to the analysis of primordial non-Gaussianity using fluctuations in the temperature and polarization of the cosmic microwave background (CMB). Following Munshi &

Adiabatic versus isocurvature non-Gaussianity

We study the extent to which one can distinguish primordial non-Gaussianity (NG) arising from adiabatic and isocurvature perturbations. We make a joint analysis of different NG models based on

A new approach to probing primordial non-Gaussianity

This work constructs a new statistic, the bispectrum-related power spectrum, which is constructed from a map of the cosmic microwave background, and presents unbiased non-Gaussianity estimators optimized for partial sky coverage and inhomogeneous noise associated with realistic scan strategies, but which retain the ability to assess foreground contamination.

New optimized estimators for the primordial trispectrum

Cosmic microwave background studies of non-Gaussianity involving higher order multispectra can distinguish between early universe theories that predict nearly identical power spectra. However, the

Cosmic microwave background alignment in multi-connected universes

The low multipoles of the cosmic microwave background (CMB) anisotropy possess some strange properties such as the alignment of the quadrupole and the octopole, and the extreme planarity or the

CMB multipole measurements in the presence of foregrounds

Most analysis of cosmic microwave background spherical harmonic coefficients ${a}_{\ensuremath{\ell}m}$ has focused on estimating the power spectrum



New Non-Gaussian Feature in COBE-DMR 4 Year Maps

A strong non-Gaussian signal is found in the "interscale" components of the bispectrum: their observed values concentrate close to zero instead of displaying the scatter expected from Gaussian maps.

First-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results

We present full-sky microwave maps in five frequency bands (23-94 GHz) from the Wilkinson Microwave Anisotropy Probe (WMAP) first-year sky survey. Calibration errors are less than 0.5%, and the low

First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Foreground Emission

The WMAP mission has mapped the full sky to determine the geometry, content, and evolution of the universe. Full sky maps are made in five microwave frequency bands to separate the temperature

Cubic anomalies in the Wilkinson Microwave Anisotropy Probe

We perform a frequentist analysis of the bispectrum of the Wilkinson Microwave Anisotropy Probe first-year data. We find clear signal domination up to l 200, with overall consistency with

Measurement of the Cosmic Microwave Background Bispectrum on the COBE DMR Sky Maps

We measure the angular bispectrum of the cosmic microwave background (CMB) radiation anisotropy from the COBE Differential Microwave Radiometer (DMR) 4 yr sky maps. The angular bispectrum is the

Asymmetries in the Cosmic Microwave Background Anisotropy Field

We report on the results from two independent but complementary statistical analyses of the Wilkinson Microwave Anisotropy Probe (WMAP) first-year data, based on the power spectrum and N-point

On Foreground Removal from the Wilkinson Microwave Anisotropy Probe Data by an Internal Linear Combination Method: Limitations and Implications

We study the Internal Linear Combination (ILC) method presented by the Wilkinson Microwave Anisotropy Probe (WMAP) science team, with the goal of determining whether it may be used for cosmological

Cosmic Microwave Background Polarization Experiments

We discuss the analysis of polarization experiments with particular emphasis on those that measure the Stokes parameters in a ring on the sky. We discuss the ability of these experiments to separate

The statistical significance of the low cosmic microwave background mulitipoles

The Wilkinson Microwave Anisotropy Probe (WMAP) has measured lower amplitudes for the temperature quadrupole and octopole anisotropies than expected in the best fitting (concordance) A-dominated cold

The Wiener-Filtered COBE DMR Data and Predictions for the Tenerife Experiment

We apply a Wiener filter to the two-year COBE DMR data. The resulting sky map has significantly reduced noise levels compared to the raw data: the most prominent hot and cold spots are significant at