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II/363 The band-merged unWISE Catalog (Schlafly+, 2019)
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The unWISE Catalog: two billion infrared sources from five years of WISE
imaging.
Schlafly E.F., Meisner A.M., Green G.M.
<Astrophys. J. Suppl. Ser., 240, 30 (2019)>
=2019ApJS..240...30S
=2020yCat.2363....0S
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ADC_Keywords: Infrared sources ; Photometry, infrared ; Surveys
Mission_Name: WISE
Keywords: catalogs ; infrared: general ; surveys ; techniques: photometric
Abstract:
We present the unWISE Catalog, containing the positions and fluxes of
roughly 2 billion objects observed by the Wide-field Infrared Survey
Explorer (WISE) over the full sky. The unWISE Catalog has two
advantages over the existing WISE catalog (AllWISE): first, it is
based on significantly deeper imaging, and second, it features
improved modeling of crowded regions. The deeper imaging used in the
unWISE Catalog comes from the coaddition of all publicly available
3-5um WISE imaging, including that from the ongoing
NEOWISE-reactivation mission, thereby increasing the total exposure
time by a factor of 5 relative to AllWISE. At these depths, even at
high Galactic latitudes, many sources are blended with their
neighbors; accordingly, the unWISE analysis simultaneously fits
thousands of sources to obtain accurate photometry. Our new catalog
detects sources roughly 0.7mag fainter than the AllWISE catalog at
5sigma, and more accurately models millions of faint sources in the
Galactic plane, enabling a wealth of Galactic and extragalactic
science. In particular, relative to AllWISE, unWISE doubles the number
of galaxies detected between redshifts 0 and 1 and triples the number
between redshifts 1 and 2, cataloging more than half a billion
galaxies over the whole sky.
Description:
The unWISE Catalog analyzes the unWISE coadds of the WISE images to
detect two billion sources over the entire sky at 3.4 and 4.6microns.
The WISE point spread function has a full-width at half-maximum of
about 6", which coupled with the large number of sources means that
many sources significantly overlap with others. To accurately model
the photometry of these blended sources, the crowdsource (available on
GitHub) analysis pipeline was used to simultaneously determine the
positions and fluxes of all sources in the unWISE coadds. The greater
depth of the unWISE coadds relative to those from the first year of
the survey, combined with the crowdsource crowded-field modeling,
allow the unWISE catalog to detect roughly three times as many sources
as were detected in the AllWISE catalog.
Acknowledging WISE in publications:
Please include the following in any published material that makes use
of the WISE data products:
"This publication makes use of data products from the Wide-field
Infrared Survey Explorer, which is a joint project of the University of
California, Los Angeles, and the Jet Propulsion Laboratory/California
Institute of Technology, funded by the National Aeronautics and Space
Administration."
Please cite one or more of:
Lang, D., 2014, "unWISE: unblurred coadds of the WISE imaging"
Astronomical Journal, 147, 108.
Meisner, A.M., Lang, D., and Schlegel, D.J., 2017, "Full-depth Coadds
of the WISE and First-year NEOWISE-Reactivation Images"
Astronomical Journal, 153, 38.
Meisner, A.M., Lang, D., and Schlegel, D.J., 2017, "Deep Full-sky
Coadds from Three Years of WISE and NEOWISE Observations"
Astronomical Journal, 154, 161.