Signatures of jet-ISM interaction in a high redshift radio galaxy at cosmic noon

High redshift radio galaxies are among the most massive galaxies in the early Universe, with powerful radio jets and quasar-level AGN activity. They are the only objects at cosmic noon, where we can study feedback from both jets and quasar in the same galaxy. The central quasar is also obscured by dust (type-2 AGN), allowing us to study the host galaxy. I will present the results for a high redshift radio galaxy at z~3.5, where we identify feedback driven by shocks and photoionisation in a spatially resolved manner using JWST NIRSpec IFU data. In addition to quasar photoionisation, we detect strong jet-ISM interaction at a distance of ~15 kpc from the quasar, allowing us to assess the impact of jets beyond the host galaxy. We find this interaction is driving shocks into the surrounding medium, as shown by their ionisation ratios. We compare this with high-resolution radio spectral index maps, which show a flattening of the radio spectra, showing a strong re-acceleration of the radio plasma in the interaction region. This study highlights the importance of jet-driven feedback even in some highly accreting AGN at cosmic noon, and allows us to assess the relative contribution of shocks and photoionisation driven feedback in the same galaxy.