Large Scale Traces of Solar System Cold Dust on CMB Anisotropies

Abstract

We explore the microwave anisotropies at large angular scales produced by the emission from cold and large dust grains, expected to exist in the outer parts of the Solar System, using a simple toy model for this diuse emission. Its amplitude is constrained in the Far-IR by the COBE data and is compatible with simulations found in the literature. We analyze the templates derived after subtracting our model from the WMAP ILC 7 yr maps and investigate on the cosmological implications of such a possible foreground. The anomalies related to the low quadrupole of the angular power spectrum, the two-point correlation function, the parity and the excess of signal found in the ecliptic plane are significantly alleviated. An impact of this foreground for some cosmological parameters characterizing the spectrum of primordial density perturbations, relevant for on-going and future CMB anisotropy experiments, is found.

Issue 2.0, Accepted for pub. in MNRAS, Apr 8th, 2011, (sub. Oct 4th, 2010); 10 pages, 6 Figures, 1 table; pdflatex with mn2e, AMS, natbib, txfonts, graphicx

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• Parity Asymmetry in the CMBR Temperature Power Spectrum
• Is the CMB asymmetry due to the kinematic dipole?
• Directional dependence of CMB parity asymmetry
• An Estimator for statistical anisotropy from the CMB bispectrum
• Alignments of parity even/odd-only multipoles in CMB
• Pearson's random walk in the space of the CMB phases: evidence for parity asymmetry
• Can residuals of the Solar system foreground explain low multipole anomalies of the CMB ?
• Preferred axis of CMB parity asymmetry in the masked maps
• Recent developments in astrophysical and cosmological exploitation of microwave surveys