UKIDSS

UKIDSS
Name	UKIDSS
Caption	United Kingdom Infrared Deep Sky Survey
Organization	University of Cambridge, Institute of Astronomy, Cambridge, Wide Field Camera, United Kingdom Astronomical Technology Centre, Cambridge Astronomical Survey Unit
Country	United Kingdom
Established	2005
Wavelength	Near-infrared
Telescope	United Kingdom Infrared Telescope
Instruments	WFCAM

UKIDSS is the United Kingdom Infrared Deep Sky Survey, a large near-infrared astronomical survey executed with the United Kingdom Infrared Telescope on Mauna Kea, managed by teams at the University of Cambridge and the Cambridge Astronomical Survey Unit. It produced multi-year imaging and catalogues that have been used across projects involving facilities such as Hubble Space Telescope, Spitzer Space Telescope, Sloan Digital Sky Survey, Two Micron All Sky Survey, and Gaia. The survey underpins studies that connect objects named in programs at European Southern Observatory, National Optical-Infrared Astronomy Research Laboratory, and instruments like Gemini Observatory and Subaru Telescope.

Overview

UKIDSS was conceived to complement surveys including Two Micron All Sky Survey and Sloan Digital Sky Survey by providing deeper, wide-area near-infrared coverage with WFCAM on the United Kingdom Infrared Telescope. The project coordinated science goals shared by principal investigators affiliated with Royal Observatory, Edinburgh, University of Hawaii, Imperial College London, University of Oxford, and University of Edinburgh. It defined survey components inspired by earlier efforts such as Palomar Observatory Sky Survey and later compared to programmes like VISTA Hemisphere Survey and Pan-STARRS. The management involved stakeholders from Science and Technology Facilities Council and collaboration with archive centres like Cambridge Astronomical Survey Unit and Wide Field Astronomy Unit.

Survey Design and Instrumentation

The instrument WFCAM was developed by teams at the United Kingdom Infrared Telescope, UK Astronomy Technology Centre, and partners including Institute of Astronomy, Cambridge and installed on the United Kingdom Infrared Telescope. The optical design and detector choice reflect engineering lineage tracing to projects at Laboratoire d'Astrophysique de Marseille and techniques used at Cerro Tololo Inter-American Observatory. Filters matched standards used by Two Micron All Sky Survey to enable cross-calibration with catalogues from Sloan Digital Sky Survey, Gaia, and Spitzer Space Telescope. Survey design divided observing time into components patterned after concepts from COSMOS (survey), DEEP2 Redshift Survey, UKIRT Infrared Deep Sky Survey Large Area Survey, and strategies analogous to those of CFHT Legacy Survey and DES Science Verification.

Observational Programs and Data Releases

UKIDSS executed several observational programs, each with defined footprints and depth similar in intent to programmes such as UltraVISTA, VIDEO Survey, WIRCam Deep Survey, and UKIDSS Ultra Deep Survey. Data releases (DRs) were scheduled and coordinated with archives at Cambridge Astronomical Survey Unit and compared to release practices of Sloan Digital Sky Survey DRs and Gaia data products. Observing campaigns referenced fields often used by COSMOS (survey), Lockman Hole, Chandra Deep Field South, Sloan Great Wall, and Hubble Deep Field follow-ups, enabling synergy with teams at National Radio Astronomy Observatory, Max Planck Institute for Astronomy, and California Institute of Technology.

Data Processing and Archive

Data reduction pipelines were implemented drawing on techniques from Cambridge Astronomical Survey Unit and software traditions used in projects at European Southern Observatory and Space Telescope Science Institute. Archive products were ingested into databases similar to those at Sloan Digital Sky Survey and interoperable with services offered by Centre de Données astronomiques de Strasbourg and NASA/IPAC. Quality control procedures involved experts from University of Cambridge, University of Edinburgh, and Leiden Observatory, and cross-matching routines referenced catalogues such as Two Micron All Sky Survey, Sloan Digital Sky Survey, Gaia, and AllWISE to produce reliable photometry and astrometry for follow-up by facilities like Gemini Observatory and Subaru Telescope.

Scientific Results and Discoveries

UKIDSS enabled discoveries spanning stellar, Galactic, and extragalactic astrophysics by providing deep near-infrared data used in studies connected to objects and programmes including Brown dwarfs, T dwarf, L dwarf, and searches related to the first stars and reionization. It contributed to the discovery and characterization of cool objects linked to work at European Southern Observatory and follow-up spectroscopy at Keck Observatory and Gemini Observatory. Galaxy evolution studies made use of UKIDSS data in tandem with surveys such as COSMOS (survey), DEEP2 Redshift Survey, UltraVISTA, CANDELS, and GOODS. Cosmological analyses cross-referenced UKIDSS catalogues with measurements from Planck (spacecraft), WMAP, and redshift surveys including BOSS and 6dF Galaxy Survey. Stellar population and structure research connected to projects at Galactic Archaeology with HERMES and APOGEE benefited from UKIDSS fields overlapping with programmes by European Space Agency and national observatories. The survey’s photometric redshift efforts complemented methodologies developed by teams at Max Planck Institute for Astrophysics and Institut d'Astrophysique de Paris.

Collaborations and Legacy

UKIDSS involved collaborations among institutions like University of Cambridge, Institute of Astronomy, Cambridge, United Kingdom Astronomy Technology Centre, Science and Technology Facilities Council, University of Edinburgh, Imperial College London, University of Oxford, and international partners including University of Hawaii, Max Planck Institute for Astronomy, California Institute of Technology, and Jet Propulsion Laboratory. Its legacy persists in archives used by follow-up campaigns with Hubble Space Telescope, James Webb Space Telescope, ALMA, and ground-based facilities at European Southern Observatory and National Optical-Infrared Astronomy Research Laboratory. UKIDSS datasets continue to be cited alongside catalogues from Two Micron All Sky Survey, Sloan Digital Sky Survey, Gaia, WISE, and Pan-STARRS in contemporary research and drive proposals submitted to observatories such as Gemini Observatory and Keck Observatory.

Category:Astronomical surveys