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| DEIMOS (spectrograph) | |
|---|---|
| Name | DEIMOS |
| Caption | The Keck II telescope housing DEIMOS at Mauna Kea |
| Organization | W. M. Keck Observatory |
| Location | Mauna Kea Observatory, Hawaiʻi |
| Aperture | 10 m (Keck II) |
| Type | Multi-object optical spectrograph |
| First light | 1999 |
DEIMOS (spectrograph) DEIMOS is a multi-object optical spectrograph installed on Keck II at the W. M. Keck Observatory on Mauna Kea. Designed for wide-field spectroscopy, DEIMOS has enabled major surveys and follow-up programs associated with institutions such as California Institute of Technology, Carnegie Institution for Science, University of California, Berkeley, Institute for Astronomy (University of Hawaiʻi), and collaborations including the Sloan Digital Sky Survey teams. DEIMOS has been central to observational programs tied to projects like the COSMOS field, the DEEP2 Redshift Survey, and follow-up of candidates from the Hubble Space Telescope, Chandra X-ray Observatory, and Spitzer Space Telescope.
DEIMOS was conceived through collaboration among researchers at Caltech, University of California, Santa Cruz, Keck Observatory, and instrument groups linked to the Jet Propulsion Laboratory and Palomar Observatory. Commissioned in the late 1990s, DEIMOS was optimized for faint-object spectroscopy across a large field-of-view on Keck II’s prime focus, enabling multiplexed observations of hundreds of targets drawn from imaging by Hubble Space Telescope, Subaru Telescope, and the Canada–France–Hawaii Telescope. The instrument has been used for programs addressing cosmology, galaxy evolution, stellar populations in the Local Group, and follow-up of transient alerts from facilities such as Palomar Transient Factory, Zwicky Transient Facility, and Large Synoptic Survey Telescope planning teams.
DEIMOS employs a refractive camera and a large collimator fed by a multi-slit mask system developed in partnership with engineering groups at Caltech and fabrication teams tied to Lockheed Martin contractors. The instrument’s optical train includes a large-volume grating turret capable of hosting gratings comparable to those used by instruments at Very Large Telescope and Gemini Observatory, and a mosaic charge-coupled device array similar to detectors used in projects at Lawrence Berkeley National Laboratory and Space Telescope Science Institute. The focal-plane mask mechanism supports custom slitmasks cut for surveys like DEEP2 Redshift Survey and programs associated with Sloan Digital Sky Survey science teams; masks were designed using astrometry from catalogs produced by Two Micron All Sky Survey and imaging from Hubble Space Telescope. Mechanical and thermal design drew on heritage from instruments at Palomar Observatory and design reviews involving staff from National Optical Astronomy Observatory.
DEIMOS operates in multi-object spectroscopy, long-slit spectroscopy, and nod-and-shuffle modes, with spectral resolutions and wavelength coverage tailored by grating choice used in common with instruments at Subaru Telescope and Very Large Telescope. Typical configurations match or exceed performance benchmarks from instruments such as LRIS on Keck I and FORS2 on Very Large Telescope, achieving spectral resolutions enabling velocity precision needed for programs linked to Sloan Digital Sky Survey science and investigations by teams from Princeton University and Harvard–Smithsonian Center for Astrophysics. DEIMOS’s sensitivity and field size made it a prime facility for redshift surveys, kinematic studies of galaxies tied to groups researched by Max Planck Institute for Astronomy teams, and stellar spectroscopy comparable to studies from Ritter Observatory and Mount Stromlo Observatory heritage.
DEIMOS was the primary instrument for the DEEP2 Redshift Survey, enabling constraints on galaxy evolution used by researchers at University of California, Davis, Stanford University, and University of Washington. DEIMOS spectra contributed to measurements of baryon acoustic oscillations and large-scale structure studied alongside data from Sloan Digital Sky Survey and 2dF Galaxy Redshift Survey teams. The instrument played a crucial role in identifying high-redshift galaxies in the COSMOS field and in spectroscopic confirmation of candidates from Hubble Space Telescope deep fields, supporting teams at Space Telescope Science Institute and European Southern Observatory collaborators. DEIMOS data advanced stellar archaeology in the Local Group, aiding studies by scientists affiliated with Carnegie Institution for Science, Max Planck Institute for Astronomy, and Cambridge University. DEIMOS follow-up observations were pivotal in transient and supernova classifications coordinated with groups at Lawrence Berkeley National Laboratory and University of California, Santa Cruz.
A dedicated data reduction pipeline, developed by instrument teams collaborating with researchers at California Institute of Technology and University of Toronto, provides two-dimensional rectification, sky subtraction, wavelength calibration, and 1D extraction compatible with products from the Hubble Space Telescope archive and survey catalogs used by Sloan Digital Sky Survey researchers. The pipeline integrates algorithms comparable to those in software from Space Telescope Science Institute and leverages calibration standards maintained by observatory staff from W. M. Keck Observatory and partnerships with National Optical Astronomy Observatory. Reduced DEIMOS datasets are formatted to interoperate with analysis tools used at institutions like Institute for Advanced Study and University of Chicago for kinematic modeling, stellar population synthesis, and cosmological analyses conducted by research consortia.
Since first light in 1999, DEIMOS has undergone upgrades coordinated with observatory engineering teams and instrument groups at Caltech and University of California, Santa Cruz. Detector upgrades and controller replacements were planned with vendors and labs linked to Lawrence Berkeley National Laboratory and Jet Propulsion Laboratory to maintain performance comparable to instruments at Gemini Observatory and Very Large Telescope. Operational scheduling, queue-mode observing, and survey campaigns were managed in coordination with staff at W. M. Keck Observatory and partner institutions including University of Hawaii, Carnegie Institution for Science, and California Institute of Technology; these efforts paralleled collaborative operations seen in projects led by European Southern Observatory and National Optical Astronomy Observatory. Continuous community use, instrument maintenance, and incorporation into multi-facility follow-up networks have kept DEIMOS central to observational programs through the 21st century.
Category:Spectrographs