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UNIONS: The Ultraviolet Near-Infrared Optical Northern Survey
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abstract
The Ultraviolet Near-Infrared Optical Northern Survey (UNIONS) is a "collaboration of collaborations" that is using the Canada-France-Hawai'i Telescope, the Pan-STARRS telescopes, and the Subaru Observatory to obtain $ugriz$ images of a core survey region of 6250 deg$^2$ of the northern sky. The $10\sigma$ point source depth of the data, as measured within a 2-arcsecond diameter aperture, are $[u,g,r,i,z] = [23.7, 24.5, 24.2, 23.8, 23.3]$\ in AB magnitudes. UNIONS is addressing some of the most fundamental questions in astronomy, including the properties of dark matter, the growth of structure in the Universe from the very smallest galaxies to large-scale structure, and the assembly of the Milky Way. It is set to become the major ground-based legacy survey for the northern hemisphere for the next decade and provides an essential northern complement to the static-sky science of the Vera C. Rubin Observatory's Legacy Survey of Space and Time. UNIONS supports the core science mission of the {\it Euclid} space mission by providing the data necessary in the northern hemisphere for the calibration of the wavelength dependence of the {\it Euclid} point-spread function and derivation of photometric redshifts in the North Galactic Cap. This region contains the highest quality sky for {\it Euclid}, with low backgrounds from the zodiacal light, stellar density, extinction, and emission from Galactic cirrus. Here, we describe the UNIONS survey components, science goals, data products, and the current status of the overall program.
Forward citations
Cited by 4 Pith papers
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Assessing the large-scale angular clustering of UNIONS Lyman Break Galaxies via cross-correlations
UNIONS Lyman-break galaxy auto-clustering is unusable at large scales due to imaging systematics, but LBG x CMB-lensing and LBG x quasar cross-spectra are measured robustly, with amplitudes consistent with predictions.
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Galaxies OBserved as Low-luminosity Identified Nebulae (GOBLIN): a catalog of 43,000 high-probability dwarf galaxy candidates in the UNIONS survey
A machine-learning pipeline applied to the UNIONS survey identifies 42,965 high-probability dwarf galaxy candidates, released as the GOBLIN catalog.
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Characterizing the disruption of B\"ootes III: a missing link in the Galactic halo?
Extensive Gaia, CaHK, UNIONS, SDSS, and DELVE searches find no observational evidence that Boötes III is the progenitor of the Styx stream.
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Measuring satellite galaxy subhalo masses in redMaPPer clusters with UNIONS weak lensing data
A large UNIONS weak-lensing sample finds an increasing subhalo-to-stellar-mass ratio with cluster-centric radius in redMaPPer clusters, qualitatively confirming tidal stripping of satellite dark matter halos.
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