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

@article{Medeiros2005NonGaussianFR,
  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},
  year={2005},
  volume={367},
  pages={39-45}
}
  • J. MedeirosC. 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

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 &

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

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 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

A high-significance detection of non-Gaussianity in the WMAP 5-yr data using directional spherical wavelets

We repeat the directional spherical real Morlet wavelet analysis, used previously to detect non-Gaussianity in the Wilkinson Microwave Anisotropy Probe (WMAP) 1- and 3-yr data, on the WMAP 5-yr data.

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

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

Constraining Primordial Non-Gaussianities from the WMAP2 2-1 Cumulant Correlator Power Spectrum

We measure the 2-1 cumulant correlator power spectrum C, a degenerate bispectrum, from the second data release of the Wilkinson Microwave Anisotropy Probe (WMAP). Our high-resolution measurements

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

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

References

SHOWING 1-10 OF 39 REFERENCES

Low‐order multipole maps of cosmic microwave background anisotropy derived from WMAP

Recent analyses of the Wilkinson Microwave Anisotropy Probe (WMAP) data have suggested that the low-order multipoles of the cosmic microwave background (CMB) anisotropy distribution show

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.

High resolution foreground cleaned CMB map from WMAP

We perform an independent foreground analysis of the Wilkinson Microwave Anisotropy Probe (WMAP) maps to produce a cleaned cosmic microwave background (CMB) map (available online) useful for

Non-Gaussian signatures in the temperature fluctuation observed by the Wilkinson Microwave Anisotropy Probe

We present results from a test for the Gaussianity of the whole sky subdegree-scale cosmic microwave background (CMB) temperature anisotropy measured by the Wilkinson Microwave Anisotropy Probe

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

Assessing the effects of foregrounds and sky removal in WMAP

Many recent analyses have indicated that large scale Wilkinson Microwave Anisotropy Probe (WMAP) data display anomalies that appear inconsistent with the standard cosmological paradigm. However, the

The N-Point Correlation Functions of the First-Year Wilkinson Microwave Anisotropy Probe Sky Maps

We compute the two-, three- and four-point correlation functions from the Wilkinson Microwave Anisotropy Probe (WMAP) first-year data and compare these with a Monte Carlo ensemble of 5000

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

Tests for Non-Gaussian Statistics in the DMR Four-Year Sky Maps

We search the high-latitude portion of the COBE Differential Microwave Radiometer (DMR) 4 yr sky maps for evidence of a non-Gaussian temperature distribution in the cosmic microwave background. The

On the Non-Gaussianity Observed in the COBE Differential Microwave Radiometer Sky Maps

In this paper we pursue the origin of the non-Gaussianity determined by a bispectrum analysis of the COBE Differential Microwave Radiometer (DMR) 4 yr sky maps. The robustness of the statistic is