Deep Full-sky Coadds from Three Years of WISE and NEOWISE Observations

Understand

We have reprocessed over 100 terabytes of single-exposure WISE/NEOWISE images to create the deepest ever full-sky maps at 3-5 microns.

• We incorporate all publicly available W1 and W2 imaging - a total of ~8 million exposures in each band - from ~37 months of observations spanning 2010 January to 2015 December.
• Our coadds preserve the native WISE resolution and feature depth of coverage ~3 times greater than that of the AllWISE Atlas stacks.
• Our coadds are designed to enable deep forced photometry, in particular for the Dark Energy Camera Legacy Survey (DECaLS) and Mayall z-Band Legacy Survey (MzLS), both of which are being used to select targets for the Dark Energy Spectroscopic Instrument (DESI).