UKIRT Infrared Deep Sky Survey

UKIRT Infrared Deep Sky Survey
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Name	UKIRT Infrared Deep Sky Survey
Acronym	UKIDSS
Telescope	United Kingdom Infrared Telescope
Location	Mauna Kea
Country	United Kingdom
Instrument	Wide Field Camera (WFCAM)
Wavelength	Near-infrared
Started	2005
Completed	2012

UKIRT Infrared Deep Sky Survey is a large-scale near-infrared sky survey conducted with the United Kingdom Infrared Telescope on Mauna Kea, designed to map broad swaths of the northern sky to unprecedented depth. The program combined instruments, calibration pipelines, and observing programs to support studies across stellar astrophysics, extragalactic astronomy, and cosmology, producing catalogues and image archives used by projects associated with institutions such as the University of Cambridge, University of Oxford, Imperial College London, University of Edinburgh, and the Science and Technology Facilities Council. UKIDSS engaged collaborations including the Wide Field Camera team, staff at the Joint Astronomy Centre, and researchers linked to the Royal Astronomical Society and the European Southern Observatory.

Overview

The survey was executed on the United Kingdom Infrared Telescope using the Wide Field Camera instrument to obtain images in the J, H, and K bands across multiple survey components: the Large Area Survey, the Deep Extragalactic Survey, the Galactic Plane Survey, the Galactic Clusters Survey, and the Ultra Deep Survey. It complemented contemporaneous programmes such as the Sloan Digital Sky Survey, Two Micron All Sky Survey, Spitzer Space Telescope legacy fields, the Hubble Space Telescope deep fields, and surveys by the Subaru Telescope and Canada-France-Hawaii Telescope. The initiative interfaced with projects at the Institute of Astronomy, Cambridge, Centre for Astrophysics Research, University of Hertfordshire, and the Max Planck Institute for Astronomy.

Survey Design and Instrumentation

UKIDSS used the 3.8-m United Kingdom Infrared Telescope on Mauna Kea fitted with WFCAM to exploit a 0.21 square degree instantaneous field of view formed by four detectors. The instrument design drew on detector technology from groups at the Jet Propulsion Laboratory, the European Space Agency, and detector labs connected to the UK Astronomy Technology Centre. Survey filters and photometric systems were tied to standards maintained by teams at the Space Telescope Science Institute and by calibrations referencing catalogues from the Two Micron All Sky Survey and the Sloan Digital Sky Survey. The collaboration included scientists affiliated with the University of Hawaiʻi, University of Leicester, University of Cambridge Institute of Astronomy, and technical staff from the Science and Technology Facilities Council.

Observing Strategy and Data Processing

Observations were scheduled to optimize seeing and photometric conditions at Mauna Kea, coordinated through the Joint Astronomy Centre and observatory staff tied to the Institute for Astronomy, University of Hawaii. The survey strategy adopted-tiered depth: wide coverage via the Large Area Survey, intermediate-depth mapping via the Galactic Plane Survey and Galactic Clusters Survey, and targeted deep fields via the Deep Extragalactic Survey and Ultra Deep Survey aligned with fields observed by Chandra X-ray Observatory, Spitzer Space Telescope, and the Subaru Deep Field. Data processing pipelines were developed alongside teams at the Cambridge Astronomy Survey Unit, the Wide Field Astronomy Unit, and computing groups at the University of Durham and Queen Mary University of London, implementing astrometric solutions tied to the Two Micron All Sky Survey and photometric cross-calibration with the Sloan Digital Sky Survey photometric system.

Scientific Results and Discoveries

UKIDSS produced large catalogues that enabled discovery and characterization of low-temperature brown dwarfs, high-redshift quasars, and obscured star formation in the Galactic plane, often in synergy with follow-up at the Keck Observatory, Gemini Observatory, Very Large Telescope, and the Atacama Large Millimeter/submillimeter Array. The survey contributed to identification of T and Y dwarfs that were spectroscopically classified with instruments at the NASA Infrared Telescope Facility and Subaru Telescope, and to the discovery of quasars at redshifts z > 6 confirmed with spectra from the European Southern Observatory facilities and the Keck Observatory. UKIDSS results informed studies of stellar initial mass functions in clusters observed with the Spitzer Space Telescope and the Hubble Space Telescope, and measurements of galaxy evolution linked to datasets from the COSMOS project, the DEEP2 Redshift Survey, and the VIMOS VLT Deep Survey.

Data Releases and Access

Survey data were delivered through staged data releases coordinated by the Wide Field Astronomy Unit and the Cambridge Astronomy Survey Unit, integrated into archives accessed via the WFCAM Science Archive and cross-matched with catalogues from the Sloan Digital Sky Survey, the Two Micron All Sky Survey, and the VISTA Public Surveys. Data distribution engaged nodes at the Centre de Données astronomiques de Strasbourg and infrastructure supported by the Astrophysics Research Institute, Liverpool John Moores University and the Science and Technology Facilities Council. Public releases enabled usage by researchers at institutions including the University of California, Berkeley, Harvard-Smithsonian Center for Astrophysics, Max Planck Institute for Extraterrestrial Physics, and the Australian National University.

Legacy and Impact

UKIDSS legacy includes legacy catalogues and calibrated images that underpin follow-up science with facilities such as the James Webb Space Telescope, the Euclid mission, and the Large Synoptic Survey Telescope (now Vera C. Rubin Observatory). The survey fostered collaborations across the Royal Astronomical Society, the International Astronomical Union, and national observatories, training researchers at the University of Cambridge, University of Oxford, Imperial College London, and Queen Mary University of London. Its datasets remain a reference for studies of brown dwarfs, high-redshift quasars, Galactic structure, and galaxy evolution, and influenced instrumentation programs at the United Kingdom Astronomy Technology Centre and survey planning at the European Southern Observatory and National Optical Astronomy Observatory.

Category:Astronomical surveys