Dissecting the size-mass and $\Sigma_1$-mass relations at 1.0 < z < 2.5: galaxy mass profiles and color gradients as a function of spectral shape

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We study how half-mass radii, central mass densities ($\Sigma_1$), and color gradients change as galaxies evolve.

• We separate $\sim7,000$ galaxies into sixteen groups with similar spectral shapes; each group represents a different evolutionary stage.
• We find that different galaxy types populate different regions of both size-mass and $\Sigma_1$-mass space.
• The nine star-forming groups lie along the integrated star-forming $\Sigma_1$-mass relation.