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Quasar feedback may regulate the growth of supermassive black holes, quenchcoeval star formation, and impact galaxy morphology and the circumgalacticmedium. However, direct evidence for quasar feedback in action at the epoch ofpeak black hole accretion at z ~ 2 remains elusive. A good case in point is thez = 1.6 quasar WISEA J100211.29+013706.7 (XID 2028) where past analyses of thesame ground-based data have come to different conclusions. Here we revisit thisobject with the integral field unit of the Near Infrared Spectrograph (NIRSpec)on board the James Webb Space Telescope (JWST) as part of Early Release Scienceprogram Q3D. The excellent angular resolution and sensitivity of the JWST datareveal new morphological and kinematic sub-structures in the outflowing gasplume. An analysis of the emission line ratios indicates that photoionizationby the central quasar dominates the ionization state of the gas with no obvioussign for a major contribution from hot young stars anywhere in the host galaxy.Rest-frame near-ultraviolet emission aligned along the wide-angle cone ofoutflowing gas is interpreted as a scattering cone. The outflow has cleared achannel in the dusty host galaxy through which some of the quasar ionizingradiation is able to escape and heat the surrounding interstellar andcircumgalactic media. The warm ionized outflow is not powerful enough to impactthe host galaxy via mechanical feedback, but radiative feedback by the AGN,aided by the outflow, may help explain the unusually small molecular gas massfraction in the galaxy host.

astrophysical journal/the astrophysical journal

First results from the JWST Early Release Science Program Q3D: The Warm  Ionized Gas Outflow in z ~ 1.6 Quasar XID 2028 and its Impact on the Host  Galaxy