CMB and SZ effect separation with Constrained Internal Linear Combinations

Details CMB and SZ effect separation with Constrained Internal Linear Combinations CMB and SZ effect separation with Constrained Internal Linear Combinations

2010-06-29

arxiv.org/abs/1006.5599v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

7 pages, 3 figures, submitted to MNRAS

Scientific paper

The `Internal Linear Combination' (ILC) component separation method has been extensively used on the data of the WMAP space mission, to extract a single component, the CMB, from the WMAP multifrequency data. We extend the ILC approach for reconstructing millimeter astrophysical emissions beyond the CMB alone. In particular, we construct a Constrained ILC to extract clean maps of both the CMB or the thermal Sunyaev Zeldovich (SZ) effect, with vanishing contamination from the other. The performance of the Constrained ILC is tested on simulations of Planck mission observations, for which we successfully reconstruct independent estimates of the CMB and of the thermal SZ.

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