Fig. 5: Stellar mass surface density profile compared with local galaxies.
From: A core in a star-forming disc as evidence of inside-out growth in the early Universe
Radial profiles of stellar mass surface density (Σ★) of JADES-GS+53.18343−27.79097 at zspec = 7.43 (black line with shaded region corresponding to 16th and 84th percentiles) compared with average z = 0 stellar mass density profiles of UCDs (grey line with triangles), low-mass ellipticals (grey dotted lines with points) and high-mass ellipticals (with core or cusp as a solid line with squares and a dashed line with squares, respectively)59. We find that this galaxy is extremely compact: the stellar mass density is consistent within 0.2–0.3 dex of today’s massive ellipticals in the central region, while it is a factor of a 1,000 lower in total stellar mass. Also overplotted are the extrapolated profiles at z = 2, with the constant SFR scale length (Rs) model in green and the \({R}_{s}\propto \frac{1}{1+z}\) model in orange. We see that the redshift-dependent scale model appears more reasonable compared with the redshift 0 ellipticals.
