The VLA-COSMOS 3 GHz Large Project: Evolution of specific star formation rates out to z∼5
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Date
2020Author
Vaccari, Mattia
Leslie, Sarah K.
Schinnerer, Eva
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We provide a coherent, uniform measurement of the evolution of the logarithmic star formation rate
(SFR) – stellar mass (M∗) relation, called the main sequence of star-forming galaxies (MS), for starforming and all galaxies out to z ∼ 5. We measure the MS using mean stacks of 3 GHz radio continuum
images to derive average SFRs for ∼ 200,000 mass-selected galaxies at z > 0.3 in the COSMOS field.
We describe the MS relation adopting a new model that incorporates a linear relation at low stellar
mass (log(M∗/M )<10) and a flattening at high stellar mass that becomes more prominent at low
redshift (z < 1.5). We find that the SFR density peaks at 1.5 < z < 2 and at each epoch there is a
characteristic stellar mass (M∗ = 1−4×1010M ) that contributes the most to the overall SFR density.
This characteristic mass increases with redshift, at least to z ∼ 2.5. We find no significant evidence
for variations in the MS relation for galaxies in different environments traced by the galaxy number
density at 0.3 < z < 3, nor for galaxies in X-ray groups at z ∼ 0.75. We confirm that massive bulgedominated galaxies have lower SFRs than disk-dominated galaxies at a fixed stellar mass at z < 1.2.
As a consequence, the increase in bulge-dominated galaxies in the local star-forming population leads
to a flattening of the MS at high stellar masses. This indicates that “mass-quenching” is linked with
changes in the morphological composition of galaxies at a fixed stellar mass.