2 August 2014 Analyzing the first JWST-NIRISS NRM test data
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Abstract
The James Webb Space Telescope (JWST) Near IR Imager and Slitless Spectrograph (NIRISS) has a seven hole non-redundant mask (NRM) in its pupil. The interferometric resolution obtained with the NRM provides a reliable measure of the magnification, position, and distribution of the PSF. The NRM image is Nyquist sampled at 4μm and operates with medium-band filters F380M, F430M, and F480M on NIRISS. We discuss cryovac CV1RR early NRM test data on the instrument. An image-plane, point-source model serves as a predictive tool for the NRM PSF, whose fine scale features' relative intensity can be used to measure detector non-linearities and determine its plate scale and rotation. We present a conservative estimate of NRM's wide-field astrometric performance. We present an analysis of the NIRISS plate scale and detector response as well as a prediction for NRM on-sky performance, taking into account measured intrapixel sensitivities, at fields, and detector linearity corrections.
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Alexandra Z. Greenbaum, Alexandra Z. Greenbaum, André R. Martel, André R. Martel, Anand Sivaramakrishnan, Anand Sivaramakrishnan, Kevin Volk, Kevin Volk, Laurent Pueyo, Laurent Pueyo, Étienne Artigau, Étienne Artigau, Peter Tuthill, Peter Tuthill, } "Analyzing the first JWST-NIRISS NRM test data", Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 91434M (2 August 2014); doi: 10.1117/12.2056346; https://doi.org/10.1117/12.2056346
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