Omar tells us about the excellent quality lensing map he’s produced with the Atacama Cosmology Telescope collaboration. You honestly won’t believe how well this lensing map correlates with the cosmic infrared background (sorry about the clickbait). The map will be incredibly useful to cross-correlate with any dataset of tracers inside the relatively large window of ACT observations.

Omar also explains how he and the collaboration, for the first time, removed the annoying thermal Sunyaev–Zeldovich contamination that ordinarily produces a ~10% bias in sigma8 (and thus any other cosmological parameter correlated with sigma8).

Paper: https://arxiv.org/abs/2004.01139
Omar: http://www.damtp.cam.ac.uk/person/od261
Map page on NASA LAMBDA: https://lambda.gsfc.nasa.gov/product/act/act_dr4_derived_maps_get.cfm