Dynamics of GN-z11 Explored by JWST Integral Field Spectroscopy: Gaseous Rotating Disk at z=10.60 Suggestive of Weak Feedback?

We investigate the dynamics of GN-z11, a luminous galaxy at $z=10.60$, carefully analyzing the public deep integral field spectroscopy (IFS) data taken with JWST NIRSpec IFU. While the observations of the IFS data originally targeted a He II clump near GN-z11, we find that C III]λλ1907,1909 emission from ionized gas at GN-z11 is bright and spatially extended significantly beyond the point-spread function (PSF) in contrast with the GN-z11's compact UV-continuum morphology. The spatially extended C III] emission of GN-z11 shows a velocity gradient, red- and blue-shifted components in the NE and SW directions, respectively, which cannot be explained by the variation of [C III]λ1907/C III]λ1909 line ratios. We perform forward modeling with GalPak³D, including the effects of PSF smearing and line blending, and find that the best-fit model is a nearly edge-on disk with a rotation velocity of vᵣot=376₋₁₅₁⁺¹¹⁰ km s⁻¹, a velocity dispersion of σᵥ=113₋₄₈⁺²⁴ km s⁻¹, and a ratio of vᵣot/σᵥ=3.3-1.5+1.7, indicative of a rotation-dominated disk at $z=10.6$. Interestingly, the disk rotation velocity is faster than the circular velocity at the virial radius, vc(r₂₀₀)=205₋₃₄⁺²⁸ km s⁻¹, estimated from the stellar mass, suggesting a compact disk produced under weak feedback such predicted in numerical simulations. In fact, the half-light radius of the C III] emitting gas disk is only 294±45 pc, while the one of the stellar UV component is even smaller, 196±12 pc. While higher S/N data are necessary for a conclusion, these observational results would suggest that GN-z11 has a fast-rotating gaseous disk whose center possesses luminous stellar components or AGN providing weak feedback.