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17 July 2017 λ = 2.4 to 5  μm spectroscopy with the James Webb Space Telescope NIRCam instrument
Thomas P. Greene, Douglas M. Kelly, John Stansberry, Jarron M. Leisenring, Everett A. Schlawin, Eiichi Egami, Laurie Chu, Klaus W. Hodapp, Marcia J. Rieke
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Funded by: NASA James Webb Space Telescope, NASA Terrestrial Hydrology Program
Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 3, Issue 3, 035001 (July 2017). https://doi.org/10.1117/1.JATIS.3.3.035001
Abstract
The James Webb Space Telescope near-infrared camera (JWST NIRCam) has two 2.′2×2.′2 fields of view that can be observed with either imaging or spectroscopic modes. Either of two R∼1500 grisms with orthogonal dispersion directions can be used for slitless spectroscopy over λ=2.4 to 5.0  μm in each module, and shorter wavelength observations of the same fields can be obtained simultaneously. We describe the design drivers and parameters of the grisms and present the latest predicted spectroscopic sensitivities, saturation limits, resolving powers, and wavelength coverage values. Simultaneous short wavelength (0.6 to 2.3  μm) imaging observations of the 2.4 to 5.0  μm spectroscopic field can be performed in one of several different filter bands, either infocus or defocused via weak lenses internal to the NIRCam. The grisms are available for single-object time-series spectroscopy and wide-field multiobject slitless spectroscopy modes in the first cycle of JWST observations. We present and discuss operational considerations including subarray sizes and data volume limits. Potential scientific uses of the grisms are illustrated with simulated observations of deep extragalactic fields, dark clouds, and transiting exoplanets. Information needed to plan observations using these spectroscopic modes is also provided.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Thomas P. Greene, Douglas M. Kelly, John Stansberry, Jarron M. Leisenring, Everett A. Schlawin, Eiichi Egami, Laurie Chu, Klaus W. Hodapp, and Marcia J. Rieke "λ = 2.4 to 5  μm spectroscopy with the James Webb Space Telescope NIRCam instrument," Journal of Astronomical Telescopes, Instruments, and Systems 3(3), 035001 (17 July 2017). https://doi.org/10.1117/1.JATIS.3.3.035001
Received: 28 March 2017; Accepted: 21 June 2017; Published: 17 July 2017
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KEYWORDS
James Webb Space Telescope
Spectroscopy
Spectroscopes
Imaging spectroscopy
Cameras
Field spectroscopy
Image filtering
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