Foreground component separation with generalized Internal Linear Combination

Details Foreground component separation with generalized Internal Linear Combination Foreground component separation with generalized Internal Linear Combination

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mnras.418..467r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 418, Issue 1, pp. 467-476.

Astronomy and Astrophysics

Astronomy

Methods: Data Analysis, Ism: General, Cosmic Background Radiation

Scientific paper

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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