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We construct cosmic microwave background lensing mass maps using data fromthe 2014 and 2015 seasons of observations with the Atacama Cosmology Telescope(ACT). These maps cover 2100 square degrees of sky and overlap with a widevariety of optical surveys. The maps are signal dominated on large scales andhave fidelity such that their correlation with the cosmic infrared backgroundis clearly visible by eye. We also create lensing maps with thermalSunyaev-Zel'dovich contamination removed using a novel cleaning procedure thatonly slightly degrades the lensing signal-to-noise ratio. The cross-spectrumbetween the cleaned lensing map and the BOSS CMASS galaxy sample is detected at$10$-$\sigma$ significance, with an amplitude of $A=1.02 \pm 0.10$ relative tothe Planck best-fit LCDM cosmological model with fiducial linear galaxy bias.Our measurement lays the foundation for lensing cross-correlation science withcurrent ACT data and beyond.

The Atacama Cosmology Telescope: A CMB lensing mass map over 2100 square degrees of sky and its cross-correlation with BOSS-CMASS galaxies