The star-formation history of mass-selected galaxies from the VIDEO
  survey
  We measure star-formation rates (SFRs) and specific SFRs (SSFRs) of
Ks-selected galaxies from the VIDEO survey by stacking 1.4-GHz Very Large Array
data. We split the sample, which spans 0 < z < 3 and stellar masses 10**8.0 <
Mstellar/Msol < 10**11.5, into elliptical, irregular or starburst galaxies
based on their spectral-energy distributions. We find that SSFR falls with
stellar mass, in agreement with the `downsizing' paradigm. We consider the
dependence of the SSFR-mass slope on redshift: for our full and elliptical
samples the slope flattens, but for the irregular and starburst samples the
slope is independent of redshift. The rate of SSFR evolution reduces slightly
with stellar mass for ellipticals, but irregulars and starbursts co-evolve
across stellar masses.
  Our results for SSFR as a function of stellar mass and redshift are in
agreement with those derived from other radio-stacking measurements of
mass-selected passive and star-forming galaxies, but inconsistent with those
generated from semi-analytic models, which tend to underestimate SFRs and
SSFRs. There is a need for deeper high-resolution radio surveys such as those
from telescopes like the next-generation MeerKAT in order to probe lower masses
at earlier times and to permit direct detections, i.e. to study individual
galaxies in detail.
