unWISE Coadds: The Five-year Data Set
A. M. Meisner, D. Lang, E. F. Schlafly, D. J. Schlegel

TL;DR
This paper introduces five-year, full-sky coadded infrared maps from WISE/NEOWISE data, significantly deeper than previous releases, enabling detection of fainter sources and long-term variability studies.
Contribution
The paper presents the deepest all-sky infrared maps at 3-5 microns, combining five years of data with improved processing for astrometry and artifact removal, and introduces time-resolved coadds for motion analysis.
Findings
Deep five-year coadds are twice as sensitive as AllWISE.
New time-resolved coadds enable variability and motion measurements.
Processed maps are used for target selection in DESI and future missions.
Abstract
We present full-sky coadded maps created by uniformly combining the first five years of Wide-field Infrared Survey Explorer (WISE) and NEOWISE imaging at 3.4 microns (W1) and 4.6 microns (W2). By incorporating both pre-hibernation WISE exposures from 2010-2011 and the first four years (2013-2017) of post-hibernation exposures from the NEOWISE-Reactivation mission, we are able to provide W1/W2 coadds that span a 15 times longer time baseline and are substantially deeper than the standard AllWISE data products. Our new five-year "full-depth" coadds are now the deepest ever all-sky maps at 3-5 microns, permitting detection of sources ~2 times (~0.7 mag) fainter than AllWISE at 5 sigma significance. We additionally present an updated set of "time-resolved" W1/W2 coadds, which separately stack each of ~10 sky passes at each inertial sky location, enabling motion and variability measurements…
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