Dynamics of GN-z11 Explored by JWST Integral Field Spectroscopy: Gaseous Rotating Disk at z=10.60 Suggestive of Weak Feedback?
arxiv(2024)
摘要
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 GalPak^3D, 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
v_rot=376_-151^+110 km s^-1, a velocity dispersion of
σ_v=113_-48^+24 km s^-1, and a ratio of
v_rot/σ_v=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, v_c(r_200)=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.
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