Kavli Affiliate: Luis C. Ho
| First 5 Authors: Wen Sun, Luis C. Ho, Ming-Yang Zhuang, Chao Ma, Changhao Chen
| Summary:
We analyze 347 galaxies at redshift $4<z<9.5$ using JWST observations from
the CEERS program by fitting a two-dimensional parametric model simultaneously
to the seven-filter NIRCam images to measure the overall structural parameters
and quantify the global properties of the galaxies in the rest-frame optical
band. Particular attention is devoted to deriving robust uncertainties that
include, among other factors, the influence of cosmological surface brightness
dimming and resolution effects. Using the global S’ersic index ($n < 1.5$) and
observed axial ratio ($q < 0.6$) as a guide, we place a conservative lower
limit of $sim 45%$ on the incidence of galactic disks. Galaxies follow a
relation between rest-frame optical luminosity and effective radius in the
redshift range $4<z<9.5$, as well as separately over the intervals $4 < z < 5$
and $5 leq z < 9.5$, with a very similar slope but a marginally lower zero
point in the higher redshift bin ($R_e = 0.69 pm 0.05$ kpc) compared to the
lower redshift bin ($R_e = 0.91 pm 0.04$ kpc). Within the limitations of the
current sample size, we find no significant redshift evolution of $n$ or $R_e$
at these early epochs.
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