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Proceedings Paper

The spectral calibration of JWST/NIRSpec: results from the recent cryo-vacuum campaign (ISIM-CV3)
Author(s): Giovanna Giardino; Nora Luetzgendorf; Pierre Ferruit; Bernhard Dorner; Catarina Alves de Oliveira; Stephan M. Birkmann; Torsten Boeker; Tim Rawle; Marco Sirianni
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Paper Abstract

The NIRSpec instrument of JWST can be operated in multi-object (MOS), long-slit, and integral field mode with spectral resolutions from 100 to 2700. Its MOS mode uses about a quarter of a million individually addressable mini-slits for object selection, covering a field of view of 9 square-arcminute. We have developed a procedure to optimize a parametric model of the instrument that provides the basis for the extraction of wavelength calibrated spectra from NIRSpec data, from any of the apertures and for all the modes. Here, we summarize the steps undertaken to optimize the instrument model parameters using the data acquired during the latest cryo-vacuum campaign of the JWST Integrated Science Instrument Module, recently carried out at NASA Goddard Space Flight Center. The calibrated parametric model is able to reproduce the spatial and spectral position of the input spectra with an intrinsic accuracy (1-sigma, RMS) ~ 1/10 of a pixel in spatial and spectral direction for all the modes. The overall wavelength calibration accuracy (RMS) of the model as measured on the extracted spectra is better than 1/20 of a resolution element for all of the grating-based spectral modes and at the level of 1/14 of a resolution element for the prism. These results are well within the allocations for the model in the overall spatial and spectral calibration budget of NIRSpec.

Paper Details

Date Published: 29 July 2016
PDF: 8 pages
Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 990445 (29 July 2016); doi: 10.1117/12.2232042
Show Author Affiliations
Giovanna Giardino, European Space Research and Technology Ctr. (Netherlands)
Nora Luetzgendorf, European Space Agency (United States)
Pierre Ferruit, European Space Research and Technology Ctr. (Netherlands)
Bernhard Dorner, Max-Planck-Institut für Astronomie (Germany)
Catarina Alves de Oliveira, Space Telescope Science Institute (United States)
Stephan M. Birkmann, Space Telescope Science Institute (United States)
Torsten Boeker, Space Telescope Science Institute (United States)
Tim Rawle, Space Telescope Science Institute (United States)
Marco Sirianni, Space Telescope Science Institute (United States)


Published in SPIE Proceedings Vol. 9904:
Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave
Howard A. MacEwen; Giovanni G. Fazio; Makenzie Lystrup; Natalie Batalha; Nicholas Siegler; Edward C. Tong, Editor(s)

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