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

Meisner, A. M.; Lang, D.; Schlegel, D. J.

doi:10.3847/1538-3881/aa894e

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

Journal Article · Tue Sep 26 00:00:00 EDT 2017 · Astronomical Journal (Online)

DOI:https://doi.org/10.3847/1538-3881/aa894e· OSTI ID:1421811

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Univ. of California, Berkeley, CA (United States). Berkeley Center for Cosmological Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of Toronto, ON (Canada). Dept. of Astronomy & Astrophysics and Dunlap Inst.; Univ. of Waterloo, ON (Canada). Dept. Physics & Astronomy
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Here, we have reprocessed over 100 terabytes of single-exposure Wide-field Infrared Survey Explorer (WISE)/NEOWISE images to create the deepest ever full-sky maps at 3-5 microns. We include 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 typically incorporate ~3× more input frames than those 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. We describe newly introduced processing steps aimed at leveraging added redundancy to remove artifacts, with the intent of facilitating uniform target selection and searches for rare/exotic objects (e.g., high-redshift quasars and distant galaxy clusters). Forced photometry depths achieved with these coadds extend 0.56 (0.46) magnitudes deeper in W1 (W2) than is possible with only pre-hibernation WISE imaging.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Aeronautic and Space Administration (NASA)

DOE Contract Number:: AC02-05CH11231

OSTI ID:: 1421811

Journal Information:: Astronomical Journal (Online), Journal Name: Astronomical Journal (Online) Journal Issue: 4 Vol. 154; ISSN 1538-3881

Publisher:: IOP Publishing - AAAS

Country of Publication:: United States

Language:: English

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