UNIONS: The Ultraviolet Near-infrared Optical Northern Survey

作者：Stephen Gwyn, Alan W. McConnachie, Jean‐Charles Cuillandre, K. C. Chambers, E. A. Magnier, Thomas de Boer, Michael J. Hudson, Masamune Oguri, Hisanori Furusawa, H. Hildebrandt, R. G. Carlberg, Sara L. Ellison, Junko Furusawa, R. Gavazzi, Rodrigo Ibata, Y. Mellier, Ken Osato, H. Aussel, Lucie Baumont, Manuel Bayer, O. Boulade, Patrick Côté, David Chemaly, C. Daley, Pierre–Alain Duc, F. Durret, A. Ellien, S. Fabbro, Leonardo Ferreira, Itsna K. Fitriana, E. Le Floc’h, Yoshinobu Fudamoto, Hua Gao, L.W.K Goh, Tomotsugu Goto, Sacha Guerrini, Axel Guinot, V. Hénault-Brunet, F. Hammer, Yuichi Harikane, Kohei Hayashi, Nick Heesters, Kohei Ichikawa, M. Kilbinger, P. B. Kuzma, Qinxun Li, T.I Liaudat, Chien-Cheng Lin, Oliver Müller, Nicolas F. Martin, Yoshiki Matsuoka, G. E. Medina, Hironao Miyatake, Satoshi Miyazaki, Charlie T. Mpetha, Tohru Nagao, Julio F. Navarro, Masafumi Niwano, Itsuki Ogami, N. Okabe, Masafusa Onoue, Gregory S. H. Paek, Laura C. Parker, David R. Patton, Fabian Hervas Peters, S. Prunet, Rubén Sánchez-Janssen, M. Schultheis, Federico Sestito, Simon E. T. Smith, Jean‐Luc Starck, Else Starkenburg, Connor Stone, Christopher Storfer, Yoshihisa Suzuki, T. Erben, Salvatore Taibi, Guillaume F. Thomas, Yoshiki Toba, Hisakazu Uchiyama, D. Valls‐Gabaud, Kim A. Venn, Ludovic Van Waerbeke, R. J. Wainscoat, Scott Wilkinson, Anna Wittje, T. Yoshida, TianFang Zhang, Yuxing Zhong · 发表于：The Astronomical Journal · 年份：2025 · DOI：10.3847/1538-3881/ae03ab · 被引用次数：19 · 研究领域：Photocathodes and Microchannel Plates、Atmospheric Ozone and Climate、Calibration and Measurement Techniques

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 σ point source depth of the data, as measured within a 2″ 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 a major ground-based legacy survey for the northern hemisphere for the next decade, and it 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 Euclid space mission by providing the data necessary in the northern hemisphere for the calibration of the wavelength dependence of the Euclid point-spread function and derivation of photometric redshifts in the North Galactic Cap. This region contains the highest quality sky for 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 statu...