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| Keck/DEIMOS | |
|---|---|
| Name | DEIMOS |
| Location | W. M. Keck Observatory, Mauna Kea |
| Operator | California Institute of Technology; University of California |
| Aperture | 10-meter (Keck II) |
| Type | Multi-object spectrograph |
| First light | 1999 |
Keck/DEIMOS The Deep Extragalactic Imaging Multi-Object Spectrograph is a high-throughput, high-resolution facility instrument deployed at the W. M. Keck Observatory on Mauna Kea and operated by the California Institute of Technology and the University of California. Designed for faint-object spectroscopy, it has supported investigations spanning extragalactic astronomy, cosmology, and stellar populations, contributing to projects associated with the Hubble Space Telescope, Sloan Digital Sky Survey, and the Very Large Telescope. DEIMOS has been integral to surveys linked to the COSMOS field, GOODS, and the Canada–France–Hawaii Telescope Legacy Survey.
DEIMOS was commissioned on the Keck II telescope to enable multiplexed spectroscopy for targets discovered by instruments such as the Hubble Space Telescope Advanced Camera for Surveys, the Subaru Telescope Suprime-Cam, and the Canada–France–Hawaii Telescope MegaCam. The instrument serves programs involving the Sloan Digital Sky Survey, the Two Micron All Sky Survey, the Spitzer Space Telescope, the Chandra X-ray Observatory, and the European Southern Observatory follow-ups. DEIMOS has been used in studies related to the Cosmic Microwave Background measurements by the Wilkinson Microwave Anisotropy Probe, baryon acoustic oscillations analyses comparable to work from the Baryon Oscillation Spectroscopic Survey, and high-redshift galaxy confirmation for surveys like GOODS-N and the Hubble Ultra Deep Field.
DEIMOS employs a large collimator, a mosaic CCD focal plane, and a high-dispersion grating assembly inspired by spectrographs developed at institutions such as the Keck Observatory Instrument Development Group, the Lawrence Berkeley National Laboratory, and the W. M. Keck Observatory partners. The focal plane mosaic comprises multiple CCDs comparable to detectors used on the Subaru Telescope or the Gran Telescopio Canarias, providing wide wavelength coverage for optical programs aligned with the Gemini Observatory instruments and the European Southern Observatory spectrographs. Opto-mechanical elements reflect engineering approaches similar to the Gemini Multi-Object Spectrograph, the European Space Agency detector planning, and instrumentation techniques from the Space Telescope Science Institute. DEIMOS supports slitmasks patterned with designs used in projects like the GOODS survey and the COSMOS legacy program.
DEIMOS offers multi-object spectroscopy with hundreds of slits per mask, long-slit modes, and nod-and-shuffle techniques comparable to modes used on the Anglo-Australian Telescope and the Magellan Telescopes. Gratings and order-sorting filters permit spectral resolutions used in velocity dispersion studies akin to those from the Sloan Digital Sky Survey and kinematic projects associated with the European Southern Observatory. The instrument enables programs targeting Lyman-break galaxies identified by Hubble surveys, Type Ia supernovae follow-ups coordinated with the Supernova Cosmology Project, and stellar archaeology campaigns related to the Gaia mission and the Apache Point Observatory Galactic Evolution Experiment.
DEIMOS has been central to landmark surveys and results including redshift surveys that informed dark energy constraints similar to those from the Baryon Oscillation Spectroscopic Survey, studies of galaxy evolution connected to Hubble Deep Field analyses, and mass assembly work paralleling results from the COSMOS and GOODS collaborations. Instrument data have been used in projects related to the Supernova Cosmology Project, the High-Z Supernova Search Team, the Planck mission interpretations, and galactic archaeology investigations complementary to results from the Sloan Digital Sky Survey and the Gaia Data Release. Notable science includes confirmation of high-redshift galaxies from surveys like the Hubble Ultra Deep Field, metallicity gradients studies comparable to research at the European Southern Observatory, and kinematic mapping that complements observations from the Atacama Large Millimeter/submillimeter Array and the Very Large Telescope.
Data from DEIMOS are processed through pipelines developed by teams associated with the Keck Observatory, the California Institute of Technology, and the University of California, following reduction philosophies similar to those behind the Sloan Digital Sky Survey and the Space Telescope Science Institute calibration frameworks. Pipeline stages handle bias subtraction, flat-fielding, wavelength calibration using arc lamps analogous to Th–Ar lamps used at other observatories, sky subtraction techniques comparable to methods employed at the Anglo-Australian Telescope, and extraction algorithms inspired by software from the Gemini Observatory and the European Southern Observatory. Reduced products have been integrated into catalogs used alongside datasets from the Hubble Space Telescope, Chandra X-ray Observatory, Spitzer Space Telescope, and the Herschel Space Observatory.
Wavelength calibration and spectrophotometric standards for DEIMOS have relied on methods established by institutions like the National Optical Astronomy Observatory, the Space Telescope Science Institute, and the European Southern Observatory. Performance metrics such as spectral resolution, throughput, and signal-to-noise benchmarks are routinely compared to instruments on the Subaru Telescope, the Very Large Telescope, and the Gemini Observatory. Cross-calibration efforts have been performed in coordination with programs from the Sloan Digital Sky Survey, the Two Micron All Sky Survey, and the Pan-STARRS project to ensure consistency in redshift catalogs and flux measurements used by the Hubble and Spitzer communities.
Since first light in 1999, DEIMOS operations have been managed within the institutional framework of the W. M. Keck Observatory partners, including the California Institute of Technology, the University of California system, and contributions from instrument teams with ties to Lawrence Berkeley National Laboratory. Upgrades and maintenance have followed patterns seen in instrument lifecycle programs at the European Southern Observatory, the Subaru Telescope, and the Gemini Observatory, with improvements to CCDs, electronics, and software to remain competitive with facilities such as the Very Large Telescope and the Thirty Meter Telescope planning studies. DEIMOS continues to support legacy surveys and new programs that overlap with missions including the Hubble Space Telescope, James Webb Space Telescope, Euclid, and the Vera C. Rubin Observatory.
Category:Keck Observatory instruments