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| CNOC2 Redshift Survey | |
|---|---|
| Name | CNOC2 Redshift Survey |
| Area | 1.5 deg^2 |
| Epochs | 1990s |
| Wavelength | Optical |
| Status | Completed |
CNOC2 Redshift Survey The CNOC2 Redshift Survey was a wide-field spectroscopic redshift survey conducted in the 1990s to measure galaxy redshifts, luminosity functions, and large-scale structure at intermediate redshifts. The project combined imaging and multiobject spectroscopy to study galaxy evolution, clustering, and environment, producing a publicly used dataset that informed work on galaxy formation, dark matter, and cosmological parameters.
The survey targeted intermediate-redshift galaxies to quantify the evolution of the galaxy luminosity function and clustering amplitude using spectroscopic redshifts, photometric selection, and statistical corrections. Principal goals connected observational programs led by academic groups associated with institutions such as University of Toronto, University of British Columbia, McMaster University, and collaborations with observatories like Canada–France–Hawaii Telescope and European Southern Observatory. The team placed emphasis on comparisons with contemporaneous projects including Sloan Digital Sky Survey, 2dF Galaxy Redshift Survey, DEEP2 Redshift Survey, and WiggleZ Dark Energy Survey to cross-calibrate measurements of large-scale structure, luminosity evolution, and galaxy bias.
The CNOC2 strategy employed multi-band imaging for target selection, followed by multiobject spectroscopy with masks patterned after techniques used in projects such as Canada–France Redshift Survey and instrumentation developments linked to CFHT MOS. Fields were chosen in widely separated sky regions to minimize cosmic variance, drawing on astrometric ties to reference catalogs like USNO catalog and photometric calibrations anchored to standards used in Hubble Space Telescope programs and ground-based surveys. Observing campaigns leveraged observing proposals coordinated with time allocation committees at facilities associated with Mauna Kea Observatories, and integrated observing practices developed in parallel with surveys such as Las Campanas Redshift Survey.
Raw spectroscopic frames were processed with reduction pipelines influenced by software traditions from projects like IRAF and data analysis workflows comparable to those used by Beijing–Arizona Sky Survey practitioners. Wavelength calibration used arc-lamp references similar to approaches at Kitt Peak National Observatory, while sky subtraction and 1D extraction mirrored methods adopted in high-throughput surveys including Sloan Digital Sky Survey. Final catalogs provided redshift quality flags, spectral classifications, and multi-band photometry enabling cross-matches with catalogs from missions such as Two Micron All Sky Survey and imaging datasets utilized by teams working on Canada-France-Hawaii Legacy Survey.
CNOC2 produced measurements of the galaxy luminosity function evolution that informed theoretical models developed in the context of Lambda-CDM structure formation and semi-analytic models from groups associated with Max Planck Institute for Astrophysics and Institute for Advanced Study. Clustering measurements constrained the evolution of bias, complementing results from SDSS analyses and cosmological parameter studies influenced by Wilkinson Microwave Anisotropy Probe and Planck (spacecraft). Studies using CNOC2 data addressed the role of environment in galaxy evolution, connecting to work on morphologies and star-formation rates explored by teams at Space Telescope Science Institute and in surveys like COSMOS (survey). Results also contributed to understanding of galaxy groups and the halo occupation distribution, linking to theoretical frameworks from Silk (astrophysicist), Peebles (astronomer), and models developed at University of California, Berkeley.
Observations used multiobject spectrographs and wide-field imagers on telescopes operated by observatories including Canada–France–Hawaii Telescope, with instrumentation heritage related to multi-slit systems employed at facilities such as Keck Observatory and W. M. Keck Observatory. Calibration and observing support drew on practices established at Mauna Kea Observatories and in instrumentation projects associated with National Research Council (Canada), while data analysis infrastructure reflected computational resources typical of groups at Perimeter Institute and university computing centers. The survey’s instrumental choices paralleled developments in fiber-fed and slit-mask spectroscopy exemplified by 2dF and DEIMOS systems.
The CNOC2 dataset became a reference for studies of intermediate-redshift galaxy populations, cited alongside major surveys such as Sloan Digital Sky Survey, 2dF Galaxy Redshift Survey, DEEP2 Redshift Survey, and VVDS (VIMOS VLT Deep Survey). Its catalogs were used to test models from groups at Max Planck Institute for Astrophysics, compare clustering results with cosmic microwave background constraints from WMAP and Planck (spacecraft), and inform follow-up programs with facilities like Subaru Telescope and Gemini Observatory. The survey influenced survey design and target-selection strategies in subsequent projects run by institutions including University of Toronto and University of British Columbia, and its legacy persists in studies of galaxy evolution, environment, and halo occupation that continue in collaborations linked to Institute for Astronomy, University of Hawaii and international consortia.
Category:Redshift surveys