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| VLA-COSMOS | |
|---|---|
| Name | VLA-COSMOS |
| Type | Radio survey |
| Telescope | Karl G. Jansky Very Large Array |
| Field | COSMOS field |
| Frequency | 1.4 GHz |
| Area | 2 deg² (wide), 0.9 deg² (deep) |
| Startdate | 2004 |
| Completed | 2010 |
| Principal investigators | Naveen A. Reddy, Eric F. Bell, Cristina C. Popescu |
VLA-COSMOS is a deep radio imaging survey of the COSMOS field conducted with the Very Large Array that produced high-resolution 1.4 GHz maps used for studies of galaxy evolution, active galactic nuclei, and large-scale structure. The project coordinated observations with multiwavelength programs including Hubble Space Telescope, Spitzer Space Telescope, Chandra X-ray Observatory, and ground-based facilities to enable cross-identification and redshift studies. VLA-COSMOS data underpin analyses combining radio continuum, optical spectroscopy, and infrared photometry to probe star formation, Active Galactic Nucleus feedback, and cosmic magnetism.
The survey targeted the two-square-degree COSMOS field selected originally for deep imaging by the Hubble Space Telescope Advanced Camera for Surveys, aligning with projects led by teams including Nicolle R. Fuller, Scoville et al., and collaborators at institutions such as National Radio Astronomy Observatory, California Institute of Technology, Jet Propulsion Laboratory, and European Southern Observatory. Observing strategies built on precedents set by surveys like FIRST (survey), NVSS, and follow-up programs associated with Sloan Digital Sky Survey and DEEP2 Galaxy Redshift Survey. The VLA-COSMOS program was coordinated with spectroscopic campaigns at Keck Observatory, Subaru Telescope, and Very Large Telescope to exploit redshift catalogs from projects such as zCOSMOS and photometric redshifts from COSMOS2015.
The observational design comprised a Wide component covering ~2 deg² and a Deep component covering ~0.9 deg² using the Very Large Array in A and B configurations, leveraging capabilities developed during upgrades by NRAO and the Karl G. Jansky VLA project. Pointing patterns referenced astrometric standards tied to the International Celestial Reference Frame and calibration procedures using flux calibrators like 3C 286 and 3C 48. Integration times and uv-coverage were optimized to reach rms sensitivities comparable to other deep radio efforts such as GOODS-N and Lockman Hole while preserving angular resolution similar to images from Hubble Space Telescope and morphological catalogs from CANDELS.
Raw visibilities were processed using software packages maintained by National Radio Astronomy Observatory, including AIPS (software), CASA (software), and custom pipelines developed by survey teams affiliated with University of California, Berkeley, Max Planck Institute for Astronomy, Harvard-Smithsonian Center for Astrophysics, and University of Bologna. Imaging included multi-scale CLEANing, self-calibration referencing methods popularized in studies with the Atacama Large Millimeter/submillimeter Array and deconvolution approaches used in MERLIN analyses. Products released to the community included radio images, source catalogs, flux density measurements, spectral index estimates, and associated masks cross-matched with catalogs from Hubble Space Telescope, Spitzer, GALEX, XMM-Newton, and Chandra X-ray Observatory.
VLA-COSMOS enabled constraints on the radio luminosity function and cosmic star formation history by cross-referencing with spectroscopic samples from zCOSMOS and photometric compilations from COSMOS2015, building on methodologies used in studies by Madau and Dickinson. The data supported identification of radio-selected Active Galactic Nucleus populations distinguishing radio-loud and radio-quiet objects in context with optical classifications from Sloan Digital Sky Survey and X-ray properties from Chandra Deep Field South. Studies using VLA-COSMOS informed models of galaxy merger triggered activity in samples overlapping with CANDELS and morphological analyses associated with Hubble Space Telescope imaging, and constrained environmental effects by correlating radio sources with large-scale structure tracers from COSMOS-20 and filament reconstructions produced by teams at Princeton University and University of Zurich.
The survey served as a backbone for follow-up programs at facilities such as Atacama Large Millimeter/submillimeter Array, Plateau de Bure Interferometer, Subaru Telescope, Keck Observatory, Very Large Telescope, and space observatories including Herschel Space Observatory and Spitzer Space Telescope. Multiwavelength integration enabled spectral energy distribution fitting techniques advanced by groups at Max Planck Institute for Astronomy and University of Cambridge to derive stellar masses, dust properties, and star formation rates, complementing radio-inferred metrics used in synergy with ALMA continuum detections and CO line studies performed by teams from IRAM and NRAO.
VLA-COSMOS established benchmarks for wide-area, high-resolution radio surveys, influencing design choices for later initiatives such as surveys with the Square Kilometre Array, ASKAP EMU, and LOFAR deep fields, and informed pipeline development by institutions like CSIRO and ASTRON. The dataset has been cited by consortia including COSMOS Collaboration, promoted interoperable archives at NASA/IPAC, and contributed to machine-learning source classification efforts led by groups at MIT and Stanford University. Its legacy persists in the role it played connecting radio continuum science to multiwavelength cosmological probes developed at Brookhaven National Laboratory, Lawrence Berkeley National Laboratory, and international university partners.
Category:Radio astronomy surveys