Fig. 3: Radial surface density profiles of stellar mass and star formation.
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★; left), SFR surface density (ΣSFR; middle) and sSFR (right) for the core (solid red lines), disc (solid blue lines) and the combination of the two (dashed black lines). The shaded regions show the 16th and 84th percentile uncertainties from both the SED fitting and the structural measurements. The half-mass radius at the time of observation is overplotted as a vertical dashed-dotted line. This figure shows that the SFR surface density of the galaxy is, at almost all radii, completely dominated by the star-forming disc, while the stellar mass surface density in the central regions is dominated by the core. The sSFR increases with radius, implying that this galaxy grows from the inside out.
