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Proceedings Paper

A unique IFU capability for JWST in the near infrared
Author(s): Eric Prieto; Pierre Ferruit; Jean-Gabriel Cuby; Pierre-Eric Blanc; Olivier Le Fevre
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Paper Abstract

We propose to implement an Integral-Field Unit (IFU) mode in the near-infrared spectrograph NIRSpec of the future James Webb Space Telescope (JWST), instrument under the responsibility of the European Space Agency (ESA). The IFU mode will provide unique additional scientific capabilities, complementary to those of the main multi-object mode of NIRSpec. It would cover a 3"x3" field of view with a 0.075" sampling and make use of the R=3000 spectral configurations of NIRSpec, covering the complete 1.0-5.0 microns range in three shots. First performance simulations yield a limiting AB magnitude of 24 for a point-like source. On the technical side, the IFU is based on the advanced image slicer concept and would include a stack of forty 900 μm thick, slicing mirrors. We are currently conducting a prototyping work funded by ESA, aiming at demonstrating a TRL6 readiness level for this technology (see presentation by F. Laurent). We present the optical design of the IFU, the strategy used during its definition (minimum impact on NIRSpec), as well as the proposed implementation within the NIRSpec instrument. We will stress that, this currently optional mode is a unique opportunity to provide JWST with a powerful integral field mode at marginal costs.

Paper Details

Date Published: 12 October 2004
PDF: 8 pages
Proc. SPIE 5487, Optical, Infrared, and Millimeter Space Telescopes, (12 October 2004); doi: 10.1117/12.549019
Show Author Affiliations
Eric Prieto, Lab. d'Astrophysique de Marseille (France)
Pierre Ferruit, Observatoire de Lyon (France)
Jean-Gabriel Cuby, Lab. d'Astrophysique de Marseille (France)
Pierre-Eric Blanc, Lab. d'Astrophysique de Marseille (France)
Olivier Le Fevre, Lab. d'Astrophysique de Marseille (France)

Published in SPIE Proceedings Vol. 5487:
Optical, Infrared, and Millimeter Space Telescopes
John C. Mather, Editor(s)

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