Data from First results from the JWST Early Release Science Program Q3D: AGN photoionization and shock ionization in a red quasar at z = 0.4

Red quasars, often associated with potent \oiii\ outflows on both galactic and circumgalactic scales, may play a pivotal role in galactic evolution and black hole feedback. In this work, we explore the \feii\ emission in one such quasar at $z = 0.4352$—F2M J110648.32+480712.3—using the integral field unit (IFU) mode of the Near Infrared Spectrograph (NIRSpec) aboard the James Webb Space Telescope (JWST). Our observations reveal clumpy \feii\ gas located to the south of the quasar. By comparing the kinematics of \feii\ and \oiii, we find that the clumpy \feii\ gas in the southeast and southwest aligns with the outflow, exhibiting similar median velocities up to v$_{50}$ $=$ 1200 \kms\ and high velocity widths W$_{80}$ $>$ 1000 \kms. In contrast, the \feii\ gas to the south shows kinematics inconsistent with the outflow, with W$_{80}$$\sim$ 500 \kms, significantly smaller than the \oiii\ at the same location, suggesting that the \feii\ may be confined within the host galaxy. Utilizing standard emission-line diagnostic ratios, we map the ionization sources of the gas. According to the MAPPINGS III shock models for $\feii$/Pa$\beta$, the regions to the southwest and southeast of the quasar are primarily photoionized. Conversely, the \feii\ emission to the south is likely excited by shocks generated by the back-pressure of the outflow on the galaxy disk, a direct signature of the impact of the quasar on its host.