Journal Article

Large-scale traces of Solar system cold dust on cosmic microwave background anisotropies

M. Maris, C. Burigana, A. Gruppuso, F. Finelli and J. M. Diego

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 3, pages 2546-2552
Published in print August 2011 | ISSN: 0035-8711
Published online August 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18879.x
Large-scale traces of Solar system cold dust on cosmic microwave background anisotropies

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We explore the microwave anisotropies on 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 diffuse emission. Its amplitude is constrained in the far–IR by the COBE data and is compatible with simulations found in the literature. We analyse 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 on some cosmological parameters characterizing the spectrum of primordial density perturbations, relevant for on-going and future cosmic microwave background anisotropy experiments, is found.

Keywords: interplanetary medium; zodiacal dust; cosmic background radiation

Journal Article.  5683 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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