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The cosmic infrared background (CIB) is gravitationally lensed. Aquadratic-estimator technique that is inherited from lensing analyses of thecosmic microwave background (CMB) can be applied to detect the CIB lensingeffects. However, the CIB fluctuations are intrinsically strongly non-Gaussian,making CIB lensing reconstruction highly biased. We perform numericalsimulations to estimate the intrinsic non-Gaussianity and establish across-correlation approach to precisely extract the CIB lensing signal from rawdata. We apply this technique to CIB data from the Planck satellite andcross-correlate the resulting lensing estimate with the CIB data, galaxy numbercounts and the CMB lensing potential. We detect an excess that is consistentwith a lensing contribution at $>4\sigma$.

An excess of non-Gaussian fluctuations in the cosmic infrared background consistent with gravitational lensing