GA-NIFS: NIRSpec reveals evidence for non-circular motions and AGN feedback in GN20

Understand

We present rest-frame optical data of the z~4 sub-millimeter galaxy GN20 obtained with JWST/NIRSpec in integral field spectroscopy (IFS) mode.

• The H$\alpha$ emission is asymmetric and clumpy and extends over a projected distance of more than 15 kpc.
• To first order, the large-scale ionised gas kinematics are consistent with a turbulent ($\sigma\sim90$ km/s), rotating disc ($v_{\rm rot}\sim500$ km/s), congruent with previous studies of its molecular and ionised gas kinematics.
• However, we also find clear evidence for non-circular motions in the H$\alpha$ kinematics.