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Foreground component separation with generalized Internal Linear Combination

M. Remazeilles 1 J. Delabrouille 2 J.-F. Cardoso 1, 3
2 APC-Gravitation - APC - Gravitation
APC (UMR_7164) - AstroParticule et Cosmologie, AEI - Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut )
Abstract : 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.
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Submitted on : Tuesday, June 19, 2012 - 4:14:29 PM
Last modification on : Thursday, November 18, 2021 - 3:57:17 AM

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M. Remazeilles, J. Delabrouille, J.-F. Cardoso. Foreground component separation with generalized Internal Linear Combination. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2011, 418, pp.467-476. ⟨10.1111/J.1365-2966.2011.19497.X⟩. ⟨in2p3-00709890⟩



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