By combining the power of spatial and spectral information, JWST IFS provide diagnostic power beyond either traditional imaging or spectroscopy alone. Main articles: MIRI Medium Resolution Spectroscopy, NIRSpec IFU Spectroscopy Integral-field units can be used to study the spatial distribution of a variety of spectroscopic quantities. Figures 1–4 below illustrate some example data products derived from integral-field spectra in the recent literature.
Figure 1. Maps of strong optical emission lines
Figure 1 shows VLT/MUSE maps of H-Alpha (left) and [N II] (right) nebular emission line from the Pillars of Creation in M16 (
McLeod et al. 2015).
Figure 2. Kinematics of galaxies
Figure 2 shows HST rest-optical imaging and Keck/OSIRIS H-Alpha maps of redshift z=2.18 galaxy Q2343-BX442, with relative velocity and velocity dispersion maps derived from the IFU data (
Law et al. 2012).
Figure 3. Spatially-resolved ionization mechanisms
Figure 3 shows maps of extended kiloparsec-scale low-ionization emission line regions in low-redshift galaxies (
Belfiore et al. 2017).
Figure 4. Ensemble studies of resolved galaxy properties
Figure 4 illustrates maps of line emission, stellar population age, and kinematics for a sample of galaxies in the CALIFA survey.