Some doubts on the validity of the foreground Galactic contribution subtraction from microwave anisotropies
arXiv:0708.4133 · doi:10.1007/s12036-007-0008-4
Abstract
The Galactic foreground contamination in CMBR anisotropies, especially from the dust component, is not easily separable from the cosmological or extragalactic component. In this paper, some doubts will be raised concerning the validity of the methods used to date to remove Galactic dust emission in order to show that none of them achieves its goal. First, I review the recent bibliography on the topic and discuss critically the methods of foreground subtraction: the cross-correlation with templates, analysis assuming the spectral shape of the Galactic components, the "maximum entropy method", "internal linear combination", and "wavelet-based high resolution fitting of internal templates". Second, I analyse the galactic latitude dependence from WMAP data. The frequency dependence is discussed with the data in the available literature. The result is that all methods of subtracting the Galactic contamination are inaccurate. The galactic latitude dependence analysis or the frequency dependence of the anisotropies in the range 50-250 GHz put a constraint on the maximum Galactic contribution in the power spectrum to be less than a ~10% (68% C. L.) for a ~1 degree scale, and possibly higher for larger scales. The origin of most of the signal in the CMBR anisotropies is not Galactic. In any case, the subtraction of the Galaxy is not accurate enough to allow a "precision Cosmology"; other sources of contamination (extragalactic, solar system) are also present.
24 pages, 1 figure, accepted to be published in J. Astrophys. Astr
References in corpus (65)
- Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
- Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
- First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
- First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Foreground Emission
- A measurement by BOOMERANG of multiple peaks in the angular power spectrum of the cosmic microwave background
- DASI First Results: A Measurement of the Cosmic Microwave Background Angular Power Spectrum
- Asymmetries in the CMB anisotropy field
- Extrapolation of Galactic Dust Emission at 100 Microns to CMBR Frequencies Using FIRAS
- Detection of non-Gaussianity in the WMAP 1-year data using spherical wavelets
- Diffuse Galactic Emission from Spinning Dust Grains
- A correlation of the cosmic microwave sky with large scale structure
- Determination of the Cosmic Distance Scale from Sunyaev-Zel'dovich Effect and Chandra X-ray Measurements of High Redshift Galaxy Clusters
- Testing the cosmological principle of isotropy: local power spectrum estimates of the WMAP data
- On the large-angle anomalies of the microwave sky
- Old stellar Galactic disc in near-plane regions according to 2MASS: scales, cut-off, flare and warp
- On Foreground Removal from the Wilkinson Microwave Anisotropy Probe Data by an Internal Linear Combination Method: Limitations and Implications
- An Anomalous Component of Galactic Emission
- Magnetic Dipole Microwave Emission from Dust Grains
- Non-Gaussian Signatures in the Temperature Fluctuation Observed by the Wilkinson Microwave Anisotropy Probe
- Non-Gaussianity of the derived maps from the first-year WMAP data
- Evidence for non-Gaussianity in the COBE DMR Four Year Sky Maps
- Galactic microwave emission at degree angular scales
- Evidence for Scale-Scale Correlations in the Cosmic Microwave Background Radiation
- Detection of anomalous microwave emission in the Perseus molecular cloud with the COSMOSOMAS experiment
- The Axis of Evil revisited
- Cross-correlation of WMAP 3rd year and the SDSS DR4 galaxy survey: new evidence for Dark Energy
- Cross-correlation of Tenerife data with Galactic templates - evidence for spinning dust?
- Phase Correlations in Cosmic Microwave Background Temperature Maps
- Microwave ISM Emission in the Green Bank Galactic Plane Survey: Evidence for Spinning Dust
- Galactic emission at 19 GHz
- in the Sky ? Microwave Anisotropies from Cosmic Defects
- Mapping the large-scale anisotropy in the WMAP data
- Inhomogeneities in the Microwave Background Radiation interpreted within the framework of the Quasi-Steady State Cosmology
- A New Spin on Galactic Dust
- Correlating anomalies of the microwave sky: The Good, the Evil and the Axis
- New non-Gaussian feature in COBE-DMR Four Year Maps
- On the CMB large-scales angular correlations
- A high-significance detection of non-Gaussianity in the WMAP 3-year data using directional spherical wavelets
- Removing real-world foregrounds from CMB maps
- The CMB temperature power spectrum from an improved analysis of the Archeops data
- Foreground Subtraction of Cosmic Microwave Background Maps using WI-FIT (Wavelet based hIgh resolution Fitting of Internal Templates)
- The Sunyaev-Zel'dovich effect in a sample of 31 clusters - a comparison between the X-ray predicted and WMAP observed CMB temperature decrement
- Anomalies in the low CMB multipoles and extended foregrounds
- High latitude Galactic dust emission in the BOOMERanG maps
- Testing Gaussian random hypothesis with the cosmic microwave background temperature anisotropies in the three-year WMAP data
- A Scaling Index Analysis of the WMAP three year data: Signatures of non-Gaussianities and Asymmetries in the CMB
- The Tenerife Cosmic Microwave Background Maps: Observations and First Analysis
- Non-Gaussianity in the WMAP data using the peak-peak correlation function
- Cosmological parameters and the WMAP data revisited
- Anomalous radio emission from dust in the Helix
- A Broadband Study of Galactic Dust Emission
- Blank field submm sources, failed stars, and the dark matter
- On dust-correlated Galactic emission in the Tenerife data
- Small-scale structure of the galactic cirrus emission
- Observations of the Cosmic Microwave Background and Galactic Foregrounds at 12-17 GHz with the COSMOSOMAS Experiment
- Non-Gaussianity due to Possible Residual Foreground Signals in WMAP 1st-year Data Using Spherical Wavelet Approaches
- The Inner Galaxy resolved at IJK using DENIS data
- Non-Gaussianity in the Very Small Array CMB maps with Smooth-Goodness-of-fit tests
- Correlations from Galactic foregrounds in the 1-year Wilkinson Microwave Anisotropy Probe WMAP data
- On the absence of gravitational lensing of the cosmic microwave background
- Cross-correlation between WMAP and 2MASS: non-Gaussianity induced by SZ effect
- Foreground contamination of the WMAP CMB maps from the perspective of the matched circle test
- Cross-Correlation analysis of WMAP and EGRET in Wavelet Space
- Fluctuations of K-band galaxy counts
- The Galactic dust as a foreground to Cosmic Microwave Background maps
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