159 articles – 2000 Notices  [english version]
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Monthly Notices of the Royal Astronomical Society 418 (2011) 467-476
Foreground component separation with generalized Internal Linear Combination
M. Remazeilles1, J. Delabrouille1, J.-F. Cardoso1, 2

The 'Internal Linear Combination' (ILC) component separation method has been extensively used to extract a single component, the cosmic microwave background (CMB), from the WMAP multifrequency data. We generalize the ILC approach for separating other millimetre astrophysical emissions. We construct in particular a multidimensional ILC filter, which can be used, for instance, to estimate the diffuse emission of a complex component originating from multiple correlated emissions, such as the total emission of the Galactic interstellar medium. The performance of such generalized ILC methods, implemented on a needlet frame, is tested on simulations of Planck mission observations, for which we successfully reconstruct a low-noise estimate of emission from astrophysical foregrounds with vanishing CMB and Sunyaev-Zel'dovich contamination.
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
2 :  LTCI - Laboratoire Traitement et Communication de l'Information [Paris]
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique
methods: data analysis – ISM: general – cosmic background radiation