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The [OIII] 5007 A emission line is the most common tracer of warm, ionizedoutflows in active galactic nuclei across cosmic time. JWST newly allows us touse mid-infrared spectral features at both high spatial and spectral resolutionto probe these same winds. Here we present a comparison of ground-based,seeing-limited [OIII] and space-based, diffraction-limited [SIV] 10.51 micronmaps of the powerful, kiloparsec-scale outflow in the Type 1 red quasar SDSSJ110648.32+480712.3. The JWST data are from the Mid-InfraRed Instrument (MIRI).There is a close match in resolution between the datasets (0."6), in ionizationpotential of the O$^{+2}$ and S$^{+3}$ ions (35 eV), and in line sensitivity(1e-17 to 2e-17 erg/s/cm$^2$/arcsec$^2$). The [OIII] and [SIV] line shapesmatch in velocity and linewidth over much of the 20 kpc outflowing nebula, and[SIV] is the brightest line in the rest-frame 3.5-19.5 micron range,demonstrating its usefulness as a mid-IR probe of quasar outflows. [OIII] isnevertheless intriniscally brighter and provides better contrast with thepoint-source continuum, which is strong in the mid-IR. There is a stronganticorrelation of [OIII]/[SIV] with average velocity, which is consistent witha scenario of differential obscuration between the approaching (blueshifted)and receding (redshifted) sides of the flow. The dust in the wind may alsoobscure the central quasar, consistent with models that attribute red quasarextinction to dusty winds.

the astrophysical journal. letters

First results from the JWST Early Release Science Program Q3D: Benchmark  Comparison of Optical and Mid-IR Tracers of a Dusty, Ionized Red Quasar Wind  at z=0.435