Flat-fielding strategy for the JWST/NIRSpec multi-object spectrograph

T. D. Rawle; C. Alves de Oliveira; S. M. Birkmann; T. Boeker; G. de Marchi; P. Ferruit; G. Giardino; N. Luetzgendorf; M. Sirianni

doi:10.1117/12.2232150

29 July 2016 Flat-fielding strategy for the JWST/NIRSpec multi-object spectrograph

T. D. Rawle, C. Alves de Oliveira, S. M. Birkmann, T. Boeker, G. de Marchi, P. Ferruit, G. Giardino, N. Luetzgendorf, M. Sirianni

Author Affiliations +

Proceedings Volume 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave; 990446 (2016) https://doi.org/10.1117/12.2232150
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

The Near-Infrared Spectrograph (NIRSpec) onboard the James Webb Space Telescope (JWST) will be the first space-borne Multi-Object Spectrograph (MOS), comprising a quarter of a million individually addressable microshutters to allow simultaneous observation of ∼100 targets. We present the strategy for flat-fielding the NIRSpec MOS, correcting for the combined effects of the telescope and instrument throughput as well as the detector response. With a highly configurable shutter array, a novel approach is required to ensure that flat- field reference observations do not significantly impact telescope efficiency. We envisage a two-step strategy: 1) Creation of a three-dimensional master flat-field reference (two spatial dimensions, one wavelength) from a small set of well-designed calibration data; 2) Correction of any data frame using a two-dimensional flat-field generated on-the-fly, for that specific MOS configuration, from the master.

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T. D. Rawle, C. Alves de Oliveira, S. M. Birkmann, T. Boeker, G. de Marchi, P. Ferruit, G. Giardino, N. Luetzgendorf, and M. Sirianni "Flat-fielding strategy for the JWST/NIRSpec multi-object spectrograph", Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 990446 (29 July 2016); https://doi.org/10.1117/12.2232150

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