WISE x SuperCOSMOS photometric redshift catalog: 20 million galaxies over 3pi steradians
M. Bilicki, J.A. Peacock, T.H. Jarrett, M.E. Cluver, N. Maddox, M.J.I., Brown, E.N. Taylor, N.C. Hambly, A. Solarz, B.W. Holwerda, I. Baldry, J., Loveday, A. Moffett, A.M. Hopkins, S.P. Driver, M. Alpaslan, J., Bland-Hawthorn

TL;DR
This paper presents a new all-sky galaxy catalog of nearly 20 million galaxies with photometric redshifts, derived from cross-matching WISE and SuperCOSMOS data, enabling advanced 3D cosmology and survey pre-selection.
Contribution
The creation of a deep, wide-area galaxy catalog with accurate photometric redshifts over 3pi steradians, utilizing multiwavelength data and external spectroscopic training.
Findings
Catalog contains ~20 million galaxies with 95% purity and 90% completeness.
Photometric redshifts have a mean bias of ~10^{-3} and scatter of 0.033.
No significant variation in photo-z quality across the sky.
Abstract
We cross-match the two currently largest all-sky photometric catalogs, mid-infrared WISE and SuperCOSMOS scans of UKST/POSS-II photographic plates, to obtain a new galaxy sample that covers 3pi steradians. In order to characterize and purify the extragalactic dataset, we use external GAMA and SDSS spectroscopic information to define quasar and star loci in multicolor space, aiding the removal of contamination from our extended-source catalog. After appropriate data cleaning we obtain a deep wide-angle galaxy sample that is approximately 95% pure and 90% complete at high Galactic latitudes. The catalog contains close to 20 million galaxies over almost 70% of the sky, outside the Zone of Avoidance and other confused regions, with a mean surface density of over 650 sources per square degree. Using multiwavelength information from two optical and two mid-IR photometric bands, we derive…
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