CMB and SZ effect separation with Constrained Internal Linear Combinations
2010
The ‘Internal Linear Combination ’ (ILC) component separation method has been ex-tensively 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 re-constructing millimeter astrophysical emissions beyond the CMB alone. In particular, we construct a Constrained ILC to extract clean maps of both the CMB or the ther-mal Sunyaev Zeldovich (SZ) effect, with vanishing contamination from the other. The performance of the Constrained ILC is tested on simulations of Planck mission obser-vations, for which we successfully reconstruct independent estimates of the CMB and of the thermal SZ.