The DEIMOS spectrograph for the Keck II Telescope: integration and testing

Faber, S. M.; Phillips, Andrew C.; Kibrick, Robert I.; Alcott, Barry; Allen, Steven L.; Burrous, J. A.; Cantrall, T.; Clarke, De A.; Coil, Alison L.; Cowley, David J.; Davis, Marc; Deich, William T. S.; Dietsch, Ken; Gilmore, D. K.; Harper, Carol Ann; Hilyard, David F.; Lewis, Jeff; McVeigh, Molly; Newman, Jeffrey A.; Osborne, Jack; Schiavon, Ricardo P.; Stover, R. J.; Tucker, Dean; Wallace, Vernon; Wei, Mingzhi; Wirth, Gregory D.; Wright, Christopher A.F.

doi:10.1117/12.460346

Cited by 657 publications

(106 citation statements)

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“…The galaxies in the K12 sample are located in the Extended Groth Strip. Spectra, from which the internal kinematics are measured, are from the DEEP2 survey (Newman et al 2013a) and were taken with the DEIMOS instrument (Faber et al 2003) on the Keck II telescope. The slits used were 1″ wide and the spectral resolution wasR 5000 (s = 26 instr km s −1 ).…”

Section: Deep2 Samplementioning

confidence: 99%

z ∼ 2: An Epoch of Disk Assembly

Simons

Kassin

Weiner

et al. 2017

ApJ

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We explore the evolution of the internal gas kinematics of star-forming galaxies from the peak of cosmic star formation atz 2 to today. Measurements of galaxy rotation velocity V rot , which quantify ordered motions, and gas velocity dispersion s g , which quantify disordered motions, are adopted from the DEEP2 and SIGMA surveys. This sample covers a continuous baseline in redshift over < < z 0.1 2.5, spanning 10 Gyr. At low redshift, nearly all sufficiently massive star-forming galaxies are rotationally supported (By z=2, 50% and 70% of galaxies are rotationally supported at low ( ) stellar mass, respectively. For, the percentage drops below 35% for all masses. From z=2 to now, galaxies exhibit remarkably smooth kinematic evolution on average. All galaxies tend toward rotational support with time, and higher-mass systems reach it earlier. This is largely due to a mass-independent decline in s g by a factor of 3 since z=2. Over the same time period, V rot increases by a factor of 1.5 in low-mass systems but does not evolve at high mass. These trends in V rot and s g are at a fixed stellar mass and therefore should not be interpreted as evolutionary tracks for galaxy populations. When populations are linked in time via abundance matching, s g declines as before and V rot strongly increases with time for all galaxy populations, enhancing the evolution in s V g rot . These results indicate that = z 2 is a period of disk assembly, during which strong rotational support is only just beginning to emerge.

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Section: Deep2 Samplementioning

confidence: 99%

z ∼ 2: An Epoch of Disk Assembly

Simons

Kassin

Weiner

et al. 2017

ApJ

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120

122

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“…Two masks targeting TriII potential member stars were observed during the night of 2015 September 17, with the DEep Imaging Multi-Object Spectrograph (DEIMOS) on KeckII (Faber et al 2003) under reasonably good conditions (0 7-1 0 seeing and ∼60% humidity; PI: Rich, program ID: 2015B_U064D). The LBC photometry used by Laevens et al (2015b) to confirm the discovery of the satellite was used to place slits on stars selected in the color-magnitude diagram (CMD) to follow the system's main sequence turn off (MSTO), sub-giant branch (SGB), and red giant branch (RGB).…”

Section: Observations and Datamentioning

confidence: 99%

Triangulum Ii: A Very Metal-Poor and Dynamically Hot Stellar System

Martín

Ibata

Collins

et al. 2016

ApJ

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We present a study of the recently discovered compact stellar system TriangulumII. From observations conducted with the DEIMOS spectrograph on KeckII, we obtained spectra for 13 member stars that follow the CMD features of this very faint stellar system and include two bright red giant branch stars. , placing TriII among the most metal-poor Milky Way dwarf galaxies. In addition, the spectra of the fainter member stars exhibit differences in their line widths that could be the indication of a metallicity dispersion in the system. All these properties paint a complex picture for TriII, whose nature and current state are largely speculative. The inferred metallicity properties of the system however lead us to favor a scenario in which TriII is a dwarf galaxy that is either disrupting or embedded in a stellar stream.

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“…Several current instruments use small-scale replication to achieve multiplex advantage. These include the DEIMOS 5 and VIMOS 6 imaging spectrographs with two and four copies of each, respectively, within single structures. The MUSE 7 instrument for ESO VLT will field-slice a 1 arcmin.…”

Section: Introductionmentioning

confidence: 99%

Design, construction, and performance of VIRUS-P: the prototype of a highly replicated integral-field spectrograph for HET

et al. 2008

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We describe the design, construction, and performance of VIRUS-P (Visible Integral-field Replicable Unit Spectrograph -Prototype), the prototype for 150+ identical fiber-fed integral field spectrographs for the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX ‡ ). VIRUS-P was commissioned in 2007, is in regular service on the McDonald Observatory 2.7 m Smith telescope, and offers the largest field of any integral field spectrograph. The 246-fiber IFU uses a densepak-type fiber bundle with a 1/3 fill factor. It is fed at f/3.65 through a telecentric, two-group dioptric focal reducer. The spectrograph's double-Schmidt optical design uses a volume phase holographic grating at the pupil between the articulating f/3.32 folded collimator and the f/1.33 cryogenic prime focus camera. High on-sky throughput is achieved with this catadioptric system by the use of high reflectivity dielectric coatings, which set the 340-670 nm bandwidth. VIRUS-P is gimbal-mounted on the telescope to allow short fibers for high UV throughput, while maintaining high mechanical stability. The instrument software and the 18 square arcmin field, fixed-offset guider provide rapid acquisition, guiding, and precision dithering to fill in the IFU field. Custom software yields Poisson noise limited, sky subtracted spectra. The design characteristics are described that achieved uniformly high image quality with low scattered light and fiber-to-fiber cross talk. System throughput exceeds requirements and peaks at 40%. The observing procedures are described, and example observations are given.

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The DEIMOS spectrograph for the Keck II Telescope: integration and testing

Cited by 657 publications

References 0 publications

z ∼ 2: An Epoch of Disk Assembly

z ∼ 2: An Epoch of Disk Assembly

Triangulum Ii: A Very Metal-Poor and Dynamically Hot Stellar System

Design, construction, and performance of VIRUS-P: the prototype of a highly replicated integral-field spectrograph for HET

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