Bubbles and outflows: the novel JWST/NIRSpec view of the z=1.59 obscured quasar XID2028

TL;DR

This study uses JWST NIRSpec observations to reveal detailed structures of ionised gas and outflows in the obscured quasar XID2028 at z=1.59, providing new insights into quasar feedback mechanisms during galaxy evolution.

Contribution

First JWST NIRSpec observations of an obscured quasar at high redshift showing detailed gas kinematics and feedback interactions, including the role of radio jets.

Findings

Detection of complex ionised gas structures and outflows.

Evidence of interaction between the interstellar medium and quasar-driven outflows.

Confirmation of the role of low-luminosity radio jets in AGN feedback.

Abstract

Quasar feedback in the form of powerful outflows is invoked as a key mechanism to quench star formation in galaxies, although direct observational evidence is still scarce and debated. Here we present Early Release Science JWST NIRSpec IFU observations of the z=1.59 prototypical obscured Active Galactic Nucleus (AGN) XID2028: This target represents a unique test case for studying quasar feedback at the peak epoch of AGN-galaxy co-evolution because extensive multi-wavelength coverage is available and a massive and extended outflow is detected in the ionised and molecular components. With the unprecedented sensitivity and spatial resolution of the JWST, the NIRSpec dataset reveals a wealth of structures in the ionised gas kinematics and morphology that were previously hidden in the seeing-limited ground-based data. In particular, we find evidence of an interaction between the interstellar medium of the galaxy and the quasar-driven outflow and radio jet that produces an expanding bubble from which the fast and extended wind detected in previous observations emerges. The new observations confirm the complex interplay between the AGN jet, wind and the interstellar medium of the host galaxy, highlighting the role of low-luminosity radio jets in AGN feedback. They also clearly show the new window that NIRSpec opens for detailed studies of feedback at high redshift.