An Integral Field Spectrograph (IFS) is an advanced astronomical instrument used to obtain detailed spectral information over a two-dimensional field of view. It combines imaging and spectroscopy, allowing astronomers to study both the spatial distribution and the spectral characteristics of light from celestial objects simultaneously.
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An integral field spectrograph records a spectrum for each of many spatial elements across a two-dimensional field, producing a spectral data cube. Field reformatters include lenslet arrays, optical fibers and image slicers.