Oral Presentation

ALMA+JWST discovers companions at <18 kpc around z~3.5 radio AGN

Author(s): Wuji Wang (Caltech/IPAC), Carlos De Breuck (ESO), Dominika Wylezalek (Heidelberg University), Jo?l Vernet (ESO)

Presenter: Wuji Wang (Caltech/IPAC)

Mergers are important in stellar mass buildup and triggering feedback especially in high-redshift universe. High-z radio galaxies (z>2, radio loud type-2 quasars) are known to trace dense protocluster environment and host by M_star~10^11 galaxies. The view on 10s of kpc scales is elusive until recent high sensitivity observatories. In this talk, I will present our joint ALMA+JWST/NIRSpec IFU view around the center of four z=3.5 radio AGN (recently accepted paper). We ubiquitously discover ~12 companion systems <18 kpc using two independent methods: (i) peculiar [OIII] kinematics; (ii) [CII] emissions. We estimate that these systems having M_dyn~10^9-11 which indicates minor merger scenario. ALL [CII] emitting blobs are detected offset from the AGN position suggesting that cold gas doesn