Structure and star formation in galaxies out to z=3: evidence for surface density dependent evolution and upsizing

Understand

We present an analysis of galaxies in the CDF-South.

• We find a tight relation to z=3 between color and size at a given mass, with red galaxies being small, and blue galaxies being large.
• We show that the relation is driven by stellar surface density or inferred velocity dispersion: galaxies with high surface density are red and have low specific star formation rates, and galaxies with low surface density are blue and have high specific star formation rates.
• Surface density and inferred velocity dispersion are better correlated with specific star formation rate and color than stellar mass.