Planck 2018 results
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Fig. 24.


Impact of the thermal SZ (tSZ) on the temperature-only lensing reconstruction spectrum at 143 GHz. We show the fractional difference between several reconstruction power spectra based on a 143 GHz full-sky simulation and the input lensing potential power spectrum (where the simulation includes tSZ and CMB, and Gaussian noise generated according to the 143-GHz channel pixel variance map). Without any masking, the contamination appears predominantly as a large point-source trispectrum contribution (orange). The point-source correction is quite effective at reducing this term below L ≃ 400, with visible residual contamination at higher L (green). After applying a fsky = 0.997 cluster mask (red), the differences from the power reconstructed in the reference CMB-only simulation with no masking (blue) are further reduced to a small fraction of a standard deviation in all bin. The left panel shows the conservative multipole range and the right panel the higher lensing multipoles.

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