An Integrated Picture of Star Formation, Metallicity Evolution, and Galactic Stellar Mass Assembly
L. L. Cowie, A. J. Barger

TL;DR
This study combines star formation, metallicity evolution, and stellar mass assembly data from z=0.05 to 1.5, revealing insights into galaxy evolution, metallicity decline, and the importance of extinction correction.
Contribution
It provides an integrated analysis of galaxy properties over a wide redshift range, linking star formation, metallicity, and mass assembly with new empirical findings.
Findings
Growth rates match models with a slightly increased IMF.
Metallicity decreases by 0.21 dex from z=0 to 0.77.
Star formation in massive galaxies ceases due to gas starvation.
Abstract
We present an integrated study of star formation and galactic stellar mass assembly from z=0.05-1.5 and galactic metallicity evolution from z=0.05-0.9 using a very large and highly spectroscopically complete sample selected by rest-frame NIR bolometric flux in the GOODS-N. We assume a Salpeter IMF and fit Bruzual & Charlot (2003) models to compute the galactic stellar masses and extinctions. We determine the expected formed stellar mass density growth rates produced by star formation and compare them with the growth rates measured from the formed stellar mass functions by mass interval. We show that the growth rates match if the IMF is slightly increased from the Salpeter IMF at intermediate masses (~10 solar masses). We investigate the evolution of galaxy color, spectral type, and morphology with mass and redshift and the evolution of mass with environment. We find that applying…
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