The Near-Infrared Spectrograph (NIRSpec) on the James Webb Space Telescope I. Overview of the instrument and its capabilities

Abstract

We provide an overview of the design and capabilities of the near-infrared spectrograph (NIRSpec) onboard the James Webb Space Telescope. NIRSpec is designed to be capable of carrying out low-resolution ($R=30-330$) prism spectroscopy over the wavelength range $0.6-5.3\mu$m and higher resolution ($R=500-1340$ or $R=1320-3600$) grating spectroscopy over $0.7-5.2\mu$m, both in single-object mode employing any one of five fixed slits, or a 3.1$\times$3.2 arcsec${}^2$ integral field unit, or in multiobject mode employing a novel programmable micro-shutter device covering a 3.6$\times$3.4~arcmin${}^2$ field of view. The all-reflective optical chain of NIRSpec and the performance of its different components are described, and some of the trade-offs made in designing the instrument are touched upon. The faint-end spectrophotometric sensitivity expected of NIRSpec, as well as its dependency on the energetic particle environment that its two detector arrays are likely to be subjected to in orbit are also discussed.

Accepted for publication in A&A. 22 pages, 19 figures

References in corpus (6)

• The James Webb Space Telescope
• The Hubble Ultra Deep Field
• The Near-Infrared Spectrograph (NIRSpec) on the James Webb Space Telescope II. Multi-object spectroscopy (MOS)
• The Near-Infrared Spectrograph (NIRSpec) on the James Webb Space Telescope III. Integral-field spectroscopy
• The Near-Infrared Spectrograph (NIRSpec) on the James Webb Space Telescope IV. Capabilities and predicted performance for exoplanet characterization
• Improved Reference Sampling and Subtraction: A Technique for Reducing the Read Noise of Near-infrared Detector Systems

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• Time-resolved JWST Retrieval Analysis of the Coldest Brown Dwarf: Temperature and Chemical Variations in WISE 0855-07
• An Estimate of the Impact of Reionization on Supermassive Black Hole Growth
• Multicolour Validation of Two Temperate Mini-Neptunes Around M-dwarf Habitable Zones
• Redshift ~2.7 is not special
• Analysing the flux stability of stellar calibrator candidates with TESS
• Optimizing the Roman Space Telescope High-Latitude Wide Area Survey for mitigating chromatic PSF effects on shear measurement
• JWST NIRSpec Spectral Standards for M, L, and T Dwarfs and Subdwarfs