Foreground component separation with generalized internal linear combination

Mathieu Remazeilles, Jacques Delabrouille, Jean-Francois Cardoso

Research output: Contribution to journalArticlepeer-review


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.
Original languageEnglish
Pages (from-to)467–476
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Publication statusPublished - 10 Nov 2011


  • methods: data analysis
  • ISM: general
  • cosmic background radiation


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