Kavli Affiliate: Luis C. Ho
| First 5 Authors: Bingcheng Jin, Luis C. Ho, Wen Sun, ,
| Summary:
We study the rest-frame ultraviolet-optical color gradients of 669 galaxies
at $4<z<8$ by characterizing the wavelength dependence of their structural
parameters derived from simultaneously fitting the seven-band NIRCam images
acquired with the James Webb Space Telescope. Distinct from trends observed at
lower redshifts, where most galaxies exhibit negative color gradients whereby
galaxy centers are redder than their outskirts, in high-redshift galaxies
positive color gradients match or even outnumber negative color gradients. The
color gradients principally reflect radial variations in stellar population
instead of dust reddening or contamination from active galactic nuclei. The
sign and magnitude of the color profile depend systematically on the global
properties of the galaxy: positive color gradients, characteristic of centrally
concentrated star formation or outside-in growth, preferentially inhabit
galaxies of lower stellar mass, smaller size, and bluer spectral energy
distribution.
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