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.

Cabella, P., Pietrobon, D., Veneziani, M., Balbi, A., Crittenden, R., DE GASPERIS, G., et al. (2010). Foreground influence on primordial non-Gaussianity estimates: needlet analysis of WMAP 5-year data. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 405(2), 961-968 [10.1111/j.1365-2966.2010.16542.x].

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

CABELLA, PAOLO;BALBI, AMEDEO;DE GASPERIS, GIANCARLO;QUERCELLINI, CLAUDIA;VITTORIO, NICOLA
2010-06-01

Abstract

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.
giu-2010
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/05 - ASTRONOMIA E ASTROFISICA
English
Con Impact Factor ISI
Cabella, P., Pietrobon, D., Veneziani, M., Balbi, A., Crittenden, R., DE GASPERIS, G., et al. (2010). Foreground influence on primordial non-Gaussianity estimates: needlet analysis of WMAP 5-year data. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 405(2), 961-968 [10.1111/j.1365-2966.2010.16542.x].
Cabella, P; Pietrobon, D; Veneziani, M; Balbi, A; Crittenden, R; DE GASPERIS, G; Quercellini, C; Vittorio, N
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/15296
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