Journal Article

Foreground influence on primordial non-Gaussianity estimates: needlet analysis of <i>WMAP</i> 5-year data

P. Cabella, D. Pietrobon, M. Veneziani, A. Balbi, R. Crittenden, G. de Gasperis, C. Quercellini and N. Vittorio

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 405, issue 2, pages 961-968
Published in print June 2010 | ISSN: 0035-8711
Published online June 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16542.x
Foreground influence on primordial non-Gaussianity estimates: needlet analysis of WMAP 5-year data

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We constrain the amplitude of primordial non-Gaussianity in the cosmic microwave background data taking into account the presence of foreground residuals in the maps. We generalize the needlet bispectrum estimator marginalizing over the amplitudes of thermal dust, free–free and synchrotron templates. We apply our procedure to Wilkinson Microwave Anisotropy Probe 5-year data, finding fNL= 38 ± 47 (1σ), while the analysis without marginalization provides fNL= 35 ± 42. Splitting the marginalization over each foreground separately, we found that the estimates of fNL are positively cross-correlated of 17 and 12 per cent with the dust and synchrotron, respectively, while a negative cross-correlation of about −10 per cent is found for the free–free component.

Keywords: methods: data analysis; cosmic background radiation; early Universe

Journal Article.  4539 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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