MOSFIRE: a multi-object near-infrared spectrograph and imager for the Keck Observatory

McLean, Ian S.; Steidel, Charles C.; Matthews, K.; Adkins, Sean M.

doi:10.1117/12.788142

Cited by 42 publications

(30 citation statements)

References 4 publications

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“…A longslit spectrum was also acquired at a position angle of 35 degrees, with a total exposure time of 2400 s in the blue arm and 2200 s in the red arm. We also acquired near-infrared imaging using the Multi-Object Spectrograph For Infrared Exploration (MOSFIRE; McLean et al 2012) on 2014-10-01 using the same telescope, in the K s and J bands. In addition, on 2015-07-23 we acquired a further 600 s of imaging with GTC/OSIRIS in the i-band, and we obtained deep FOcal Reducer/low dispersion Spectrograph 2 (FORS2) R-band imaging from the VLT archive (originally published in Greiner et al 2015a).…”

Section: Late Time Imaging and Spectral Observationsmentioning

confidence: 99%

Gas inflow and outflow in an interacting high-redshift galaxy

Wiseman

Perley

Schady

et al. 2017

A&A

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We reveal multiple components of an interacting galaxy system at z ≈ 3.35 through a detailed analysis of the exquisite high-resolution Keck/HIRES spectrum of the afterglow of a gamma-ray burst (GRB). Through Voigt-profile fitting of absorption lines from the Lyman-series, we constrain the neutral hydrogen column density to N H i ≤ 10 18.35 cm −2 for the densest of four distinct systems at the host redshift of GRB 080810, among the lowest N H i ever observed in a GRB host, despite the line of sight passing within a projected 5 kpc of the galaxy centres. By detailed analysis of the corresponding metal absorption lines, we derive chemical, ionic and kinematic properties of the individual absorbing systems, and thus build a picture of the host as a whole. Striking differences between the systems imply that the line of sight passes through several phases of gas: the star-forming regions of the GRB host; enriched material in the form of a galactic outflow; the hot and ionised halo of a second, interacting galaxy falling towards the host at a line-of-sight velocity of 700 km s −1 ; and a cool, metal-poor cloud which may represent one of the best candidates yet for the inflow of metal-poor gas from the intergalactic medium.

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Section: Late Time Imaging and Spectral Observationsmentioning

confidence: 99%

Gas inflow and outflow in an interacting high-redshift galaxy

Wiseman

Perley

Schady

et al. 2017

A&A

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“…We observed GJ 3470 on UT 2013-04-08 with the Keck I telescope using the new MOSFIRE multi-object spectrograph (McLean et al 2008(McLean et al , 2010Kulas et al 2012). MOSFIRE is a near-infrared multi-object spectrograph located on a rotatable mount at the Keck I Cassegrain focus.…”

Section: Observationsmentioning

confidence: 99%

Warm ice giant GJ 3470b

Crossfield

Barman

Hansen

et al. 2013

A&A

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We report our spectroscopic investigation of the transiting ice giant GJ 3470b's atmospheric transmission, and the first results of extrasolar planet observations from the new Keck/MOSFIRE spectrograph. We measure a planet/star radius ratio of 0.0789in a bandpass from 2.09-2.36 µm and in six narrower bands across this wavelength range. When combined with existing broadband photometry, these measurements rule out cloud-free atmospheres in chemical equilibrium assuming either solar abundances (5.4σ confidence) or a moderate level of metal enrichment (50× solar abundances, 3.8σ), confirming previous results that such models are not representative for cool, low-mass, externally irradiated extrasolar planets. Current measurements are consistent with a flat transmission spectrum, which suggests that the atmosphere is explained by high-altitude clouds and haze, disequilibrium chemistry, unexpected abundance patterns, or the atmosphere is extremely metal-rich ( > ∼ 200× solar). Because GJ 3470b's low bulk density sets an upper limit on the planet's atmospheric enrichment of < ∼ 300× solar, the atmospheric mean molecular weight must be < ∼ 9. Thus, if the atmosphere is cloud-free its spectral features should be detectable with future observations. Transit observations at shorter wavelengths will provide the best opportunity to discriminate between plausible scenarios. We obtained optical spectroscopy with the GMOS spectrograph, but these observations exhibit large systematic uncertainties owing to thin, persistent cirrus conditions. Finally, we also provide the first detailed look at the steps necessary for well-calibrated MOSFIRE observations, and provide advice for future observations with this instrument.

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“…MOSFIRE is funded in part by the Telescope System Instrumentation Program (TSIP), operated by AURA and funded by the National Science Foundation and by a private donation to WMKO by Gordon and Betty Moore. In this paper we update the instrument design 2 and describe its implementation through construction prior to telescope commissioning.…”

Section: Introductionmentioning

confidence: 99%

Design and development of MOSFIRE: the multi-object spectrometer for infrared exploration at the Keck Observatory

et al. 2010

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MOSFIRE is a unique multi-object spectrometer and imager for the Cassegrain focus of the 10 m Keck 1 telescope. A refractive optical design provides near-IR (0.97 to 2.45 μm) multi-object spectroscopy over a 6.14' x 6.14' field of view with a resolving power of R~3,270 for a 0.7" slit width (2.9 pixels in the dispersion direction), or imaging over a field of view of 6.8' diameter with 0.18" per pixel sampling. A single diffraction grating can be set at two fixed angles, and order-sorting filters provide spectra that cover the K, H, J or Y bands by selecting 3rd, 4 th , 5 th or 6 th order respectively. A folding flat following the field lens is equipped with piezo transducers to provide tip/tilt control for flexure compensation at the 0.1 pixel level. A special feature of MOSFIRE is that its multiplex advantage of up to 46 slits is achieved using a cryogenic Configurable Slit Unit or CSU developed in collaboration with the Swiss Centre for Electronics and Micro Technology (CSEM). The CSU is reconfigurable under remote control in less than 5 minutes without any thermal cycling of the instrument. Slits are formed by moving opposable bars from both sides of the focal plane. An individual slit has a length of 7.1" but bar positions can be aligned to make longer slits. When masking bars are removed to their full extent and the grating is changed to a mirror, MOSFIRE becomes a wide-field imager. Using a single, ASIC-driven, 2K x 2K H2-RG HgCdTe array from Teledyne Imaging Sensors with exceptionally low dark current and low noise, MOSFIRE will be extremely sensitive and ideal for a wide range of science applications. This paper describes the design and testing of the instrument prior to delivery later in 2010.

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MOSFIRE: a multi-object near-infrared spectrograph and imager for the Keck Observatory

Cited by 42 publications

References 4 publications

Gas inflow and outflow in an interacting high-redshift galaxy

Gas inflow and outflow in an interacting high-redshift galaxy

Warm ice giant GJ 3470b

Design and development of MOSFIRE: the multi-object spectrometer for infrared exploration at the Keck Observatory

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