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| Canada-France Imaging Survey | |
|---|---|
| Name | Canada-France Imaging Survey |
| Location | Mauna Kea Observatory, Hawaii |
| Established | 2017 |
| Telescope type | Wide-field imaging survey |
Canada-France Imaging Survey is a wide-field astronomical imaging program led by the Canada-France-Hawaii Telescope consortium with contributions from international institutes including the National Research Council (Canada), Institut National des Sciences de l'Univers, and teams associated with the University of Toronto, Institut d'Astrophysique de Paris, and the University of British Columbia. The survey aimed to produce deep, multi-band optical imaging over large sky areas to support studies ranging from dark matter mapping to galaxy evolution, and provided data products used by projects such as the Sloan Digital Sky Survey, the Dark Energy Survey, and follow-up programs at the Subaru Telescope and Gemini Observatory.
The project conducted deep imaging using the Canada-France-Hawaii Telescope at Mauna Kea Observatory with instrumentation development influenced by teams from the National Research Council (Canada), the Conseil National de la Recherche Scientifique, and the European Southern Observatory. Survey goals included providing precise photometry and astrometry to complement datasets from the Pan-STARRS project, the Gaia mission, and the Hubble Space Telescope legacy fields, supporting science cases in weak gravitational lensing, large-scale structure, and stellar population studies in the Milky Way halo. The collaboration brought together scientists from the University of Victoria, McGill University, CNRS, University of Cambridge, and the Max Planck Society.
CFIS utilized the wide-field imaging camera installed on the Canada-France-Hawaii Telescope, incorporating optical designs and detectors influenced by developments at the European Southern Observatory and detector teams from the Lawrence Berkeley National Laboratory. The observing program featured custom filter sets coordinated with calibration efforts tied to the Gaia photometric system, and engineering collaboration with the National Research Council (Canada) and instrumentation groups at the University of Hawaii. Instrument performance characterization referenced heritage from the CFHT Legacy Survey, the Sloan Digital Sky Survey, and the Dark Energy Camera initiatives.
Data reduction pipelines were developed drawing on algorithms and software practices used by the Sloan Digital Sky Survey, the Pan-STARRS collaboration, and the Hubble Space Telescope archive teams, with astrometric calibration tied to Gaia catalogs and photometric standards linked to the SDSS photometric system. The survey produced multiband coadds, image catalogs, and value-added products such as photometric redshift catalogs used by scientists at the University of Toronto, McGill University, the Institut d'Astrophysique de Paris, and the Max Planck Institute for Astronomy. Data releases were coordinated to facilitate cross-matching with archives from the Dark Energy Survey, the Large Synoptic Survey Telescope preparatory programs, and spectroscopic facilities including the Sloan Digital Sky Survey spectrographs and the W. M. Keck Observatory.
CFIS enabled studies of stellar streams and substructure in the Milky Way halo that connected to discoveries from the Gaia mission and follow-up spectroscopy at the Anglo-Australian Telescope and the William Herschel Telescope, revealing signatures consistent with past accretion events similar to those inferred in analyses of the Gaia-Enceladus merger and the Sagittarius Dwarf Spheroidal Galaxy. Galaxy evolution studies using CFIS photometry complemented surveys such as the COSMOS field campaigns and the CANDELS program, providing constraints on star formation histories, mass assembly, and stellar population gradients comparable to work by teams at the Space Telescope Science Institute and the University of California, Berkeley. Weak lensing measurements from CFIS supported cosmological parameter estimation in synergy with results from the Dark Energy Survey and theoretical frameworks developed by groups at the Institute for Advanced Study and the Perimeter Institute.
Management of the project involved coordination among national and institutional partners, including the Canada-France-Hawaii Telescope, the National Research Council (Canada), CNRS, the University of Toronto, and partner groups at the University of Cambridge and the Max Planck Society. Scientific working groups were organized around themes such as stellar archaeology, weak lensing, and galaxy evolution, involving researchers affiliated with the Institut d'Astrophysique de Paris, the University of British Columbia, the University of Victoria, and instrumentation teams connected to the Lawrence Berkeley National Laboratory and the European Southern Observatory.
The survey adopted an observing strategy optimized for depth and image quality at the Mauna Kea Observatory site, scheduling observations to exploit the best seeing conditions and to complement footprint coverage of the Pan-STARRS and Sloan Digital Sky Survey footprints. Coverage prioritized high-latitude fields to map the Milky Way halo and extragalactic fields overlapping with the COSMOS and CANDELS survey regions, enabling joint analyses with the Hubble Space Telescope archive, the Spitzer Space Telescope legacy datasets, and spectroscopic surveys executed at the W. M. Keck Observatory and the Anglo-Australian Telescope.
The survey left a legacy of calibrated imaging and catalogs that augmented archives maintained by the Canadian Astronomy Data Centre, the Centre de Données astronomiques de Strasbourg, and data portals used by researchers at the Space Telescope Science Institute and the European Southern Observatory. CFIS-enabled datasets continue to inform studies tied to the Gaia mission, the Dark Energy Survey, and preparatory science for the Vera C. Rubin Observatory and its Legacy Survey of Space and Time, serving communities at institutions such as the University of Toronto, the Max Planck Institute for Astronomy, the University of Cambridge, and the Institut d'Astrophysique de Paris.
Category:Astronomical surveys