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| HST COSMOS | |
|---|---|
| Name | HST COSMOS |
| Type | Space-based extragalactic imaging survey |
| Operator | National Aeronautics and Space Administration (NASA), European Space Agency (ESA) |
| Spacecraft | Hubble Space Telescope |
| Instruments | Advanced Camera for Surveys, Wide Field Camera 3 |
| Launch | Space Shuttle Discovery (as part of HST servicing missions) |
| Start | 2003 |
| Wavelength | Optical, near-infrared, ultraviolet |
| Area | 2 square degrees |
HST COSMOS is a large, contiguous astronomical survey conducted with the Hubble Space Telescope concentrating on a two square degree field to investigate galaxy evolution, large-scale structure, and weak gravitational lensing. The project was coordinated by a consortium including institutions such as California Institute of Technology, University of Hawaii, National Optical Astronomy Observatory and involved collaborations with ground-based facilities like Subaru Telescope, Very Large Telescope, and space observatories including Spitzer Space Telescope and Chandra X-ray Observatory. The survey produced deep, high-resolution imaging that has been widely used in studies connecting galaxy morphology, environment, and dark matter.
The COSMOS field selection prioritized accessibility to observatories including Keck Observatory, Atacama Large Millimeter/submillimeter Array, Very Large Array, Gemini Observatory, and United Kingdom Infrared Telescope while avoiding bright sources such as Sirius and regions of high zodiacal light like those targeted by Infrared Astronomical Satellite. Key planning institutions included Space Telescope Science Institute, Jet Propulsion Laboratory, Max Planck Society, and teams led by scientists associated with Harvard University, Princeton University, University of California, Berkeley, and Johns Hopkins University. The dataset is notable for combining HST angular resolution from Advanced Camera for Surveys with multiwavelength coverage from GALEX, Herschel Space Observatory, and Fermi Gamma-ray Space Telescope.
COSMOS aimed to probe galaxy assembly across cosmic time, connect baryonic tracers to dark matter mapped by weak lensing, and characterize active galactic nuclei demographics. Scientific goals referenced frameworks and milestones like the Lambda-CDM model, comparisons with simulations from groups at Max Planck Institute for Astrophysics, and constraints complementary to surveys such as Sloan Digital Sky Survey, DEEP2 Galaxy Redshift Survey, and COMBO-17. Objectives involved synergy with spectroscopic programs at Keck Observatory (DEIMOS), Very Large Telescope (VIMOS), and redshift calibration using Subaru Prime Focus Spectrograph planning. The project interfaced with legacy projects like GOODS, CANDELS, AEGIS, and COSMOS-Web to provide broader context for structure growth, AGN feedback studies tied to objects observed by Chandra X-ray Observatory and XMM-Newton.
Primary imaging used the Advanced Camera for Surveys on Hubble Space Telescope supplemented by Wide Field Camera 3 near-infrared exposures. Ancillary data incorporated observations from Spitzer Space Telescope IRAC and MIPS channels, Chandra X-ray Observatory ACIS imaging, and millimeter data from Atacama Pathfinder Experiment and IRAM 30m Telescope. Radio continuum information came from the Very Large Array and Giant Metrewave Radio Telescope. Ground-based optical and near-infrared imaging were obtained with Subaru Telescope Suprime-Cam, Canada–France–Hawaii Telescope MegaCam, United Kingdom Infrared Telescope WFCAM, and spectroscopic follow-up used instruments at Keck Observatory, Very Large Telescope, and Magellan Telescopes. Photometric redshift calibration referenced templates and codes developed at Institute for Astronomy, ETH Zurich and groups at University of Edinburgh.
Image reduction and mosaicking utilized pipelines maintained at Space Telescope Science Institute with astrometric reference frames tied to catalogs such as Two Micron All Sky Survey and Sloan Digital Sky Survey. Photometric catalogs integrated measurements from GALEX, Spitzer Space Telescope, Herschel Space Observatory, and radio catalogs from VLA FIRST and NVSS to produce multiwavelength spectral energy distributions. Public data releases included source catalogs, photometric redshifts, morphological measurements using software from groups at Max Planck Institute for Astronomy, and weak lensing shear catalogs produced with algorithms developed by teams at University of Oxford and ETH Zurich. Ancillary value-added products included group and cluster catalogs comparable to those from XMM-Newton Cluster Survey and environmental metrics cross-matched with SDSS-like large-scale structure reconstructions.
Results spanned measurement of the evolution of galaxy sizes and morphologies, stellar mass assembly, AGN demographics, and mapping dark matter via weak lensing tomography. Papers connected COSMOS findings to theoretical work from groups such as IllustrisTNG teams, comparisons with predictions of the Millennium Simulation, and tests of feedback prescriptions informed by observations from Chandra X-ray Observatory and Spitzer Space Telescope. Studies identified protocluster candidates analogous to those in SSA22 and quantified cosmic shear signals compatible with constraints from Planck (spacecraft) and Atacama Cosmology Telescope. AGN demography work linked X-ray sources to optical hosts and radio galaxies studied at VLA, while star-formation histories were constrained using far-infrared data from Herschel Space Observatory and spectroscopic indicators from Keck Observatory and VLT.
COSMOS set a benchmark for wide, deep, high-resolution extragalactic surveys and influenced the design of later programs like Euclid (spacecraft), Nancy Grace Roman Space Telescope, and ground-based efforts such as LSST (Vera C. Rubin Observatory). The survey’s multiwavelength database fostered collaborations across institutions including Caltech, NOAO, STScI, and international partners at CNRS, Max Planck Society, and National Astronomical Observatory of Japan. COSMOS-derived catalogs have been incorporated into meta-analyses with datasets from SDSS, GAMA, HSC Subaru Strategic Program, and have informed cosmological parameter estimation in concert with measurements from Planck (spacecraft) and large-scale structure surveys. Its imaging legacy continues to support studies in galaxy evolution, environment-driven processes, and dark matter mapping.
Category:Astronomical surveys