The near-infrared imager and slitless spectrograph for the James Webb Space Telescope: II. Wide field slitless spectroscopy

C.J. Willott*, R. Doyon, L. Albert, G.B. Brammer, W.V. Dixon, K. Muzic, S. Ravindranath, A. Scholz, R. Abraham, É. Artigau, M. Bradač, P. Goudfrooij, J.B. Hutchings, K.G. Iyer, R. Jayawardhana, S. LaMassa, N. Martis, M.R. Meyer, T. Morishita, L. MowlaA. Muzzin, G. Noirot, C. Pacifici, N. Rowlands, G. Sarrouh, M. Sawicki, J.M. Taylor, K. Volk, J. Zabl

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

We present the wide field slitless spectroscopy mode of the NIRISS instrument on the James Webb Space Telescope. This mode employs two orthogonal low-resolution (resolving power ≈150) grisms in combination with a set of six blocking filters in the wavelength range 0.8–2.3 μm to provide a spectrum of almost every source across the field-of-view. When combined with the low background, high sensitivity and high spatial resolution afforded by the telescope, this mode will enable unprecedented studies of the structure and evolution of distant galaxies. We describe the performance of the as-built hardware relevant to this mode and expected imaging and spectroscopic sensitivity. We discuss operational and calibration procedures to obtain the highest quality data. As examples of the observing mode usage, we present details of two planned Guaranteed Time Observations programs: The Canadian NIRISS Unbiased Cluster Survey and The NIRISS Survey for Young Brown Dwarfs and Rogue Planets.
Original languageEnglish
Article number025002
Number of pages16
JournalPublications of the Astronomical Society of the Pacific
Volume134
Issue number1032
Early online date25 Feb 2022
DOIs
Publication statusE-pub ahead of print - 25 Feb 2022

Keywords

  • Astronomical instrumentation
  • Infrared telescopes
  • Spectrometers

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