1607.05733
A first demonstration of CIB delousing
Larsen, Challinor, Sherwin, Mak
Delensing ins an increasingly important technique to reverse the gravitational lensing of the CMB and thus reveal primordial signals the lensing may obscure. Present a first demonstration of delousing on Planck temperature maps using CIB. Reversing the lensing deflections in Planck CMB temperature maps using a linear combination of the 545 and 857 GHz maps as a lensing tracer, find that the lensing effects in the temperature power spectrum are reduced in a manner consistent with theoretical expectations. In particular, the characteristic sharpening of the acoustic peaks of the temperature power spectrum resulting from successful delensing is detected at a significance of 16 sigma, with an amplitude of A_delens=1.12±0.07 relative to the expected value of unity. This first demonstration on data of CIB delensing, and of delensing techniques in general, is significant because lensing removal will soon be essential for achieving high-precision constraints on inflationary B-mode polarization.
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