The paper presents JWST/NIRSpec IFU observations of the sub-millimeter galaxy GN20, targeting rest-frame optical emission. Combined spectral analysis and dynamical modelling reveal an asymmetric and clumpy morphology of Hα line emission, whose large-scale kinematics is compatible with a turbulent (σ~90 km/s), rotating disk (vrot ~ 500 km/s), consistently with previous studies on molecular and ionised gas kinematics. Also, the authors find clear evidence for non-circular motions in Hα kinematics, possibly due to external perturbations, accretion or radial flows. In the central region, broad line emission (FWHM~1000-2000 km/s) in Hα+[NII] line multiple points to either fast AGN-driven winds or AGN broad-line region emission. The presence of an AGN in GN20 is also supported by the high values of [NII]/ Hα > 0.4 and EW(H) > 6 Å largely observed across the galaxy.
Breadcrumbs
GA-NIFS: NIRSpec reveals evidence for non-circular motions and AGN feedback in GN20
The paper presents JWST/NIRSpec IFU observations of the sub-millimeter galaxy GN20, targeting rest-frame optical emission. Combined spectral analysis and dynamical modelling reveal an asymmetric and clumpy morphology of Hα line emission, whose large-scale kinematics is compatible with a turbulent (σ~90 km/s), rotating disk (vrot ~ 500 km/s), consistently with previous studies on molecular and ionised gas kinematics. Also, the authors find clear evidence for non-circular motions in Hα kinematics, possibly due to external perturbations, accretion or radial flows. In the central region, broad line emission (FWHM~1000-2000 km/s) in Hα+[NII] line multiple points to either fast AGN-driven winds or AGN broad-line region emission. The presence of an AGN in GN20 is also supported by the high values of [NII]/ Hα > 0.4 and EW(H) > 6 Å largely observed across the galaxy.
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