Back to Volume
Paper: End to End Simulation of the JWST/NIRSpec Instrument
Volume: 314, Astronomical Data Analysis Software and Systems XIII
Page: 501
Authors: Gnata, X.; Ferruit, P.; Pecontal-Rousset, A.
Abstract: The near-infrared multi-object spectrograph NIRSpec is one of the three science instruments onboard the future James Webb Space Telescope. NIRSpec will cover the 0.6 to 5.0 mum wavelength range and will be able to obtain simultaneous spectra of more than 100 objects in a 9 square arcminute field of view, thanks to an array of micro-shutters. It has been realized that accurate modelling of the instrument was needed: to obtain realistic estimates of its expected performance and to check that the science goals could be achieved; to define and validate the operation and calibration scenarios; and, on the long run, to develop and test the data reduction software. In this context and as part of the EADS NIRSpec study funded by ESA, we have developed an end-to-end Fourier-optics model of the instrument, which takes into account both geometrical aberrations and diffraction. In this paper, we will first describe the model, its objectives and its implementation. We will then show some results and how they are used to estimate the instrument performance. We will conclude by stressing that this kind of modelling is now becoming a standard task in the studies of some major astronomical instruments.
Back to Volume