The evolving relation between star-formation rate and stellar mass in the VIDEO Survey since
arXiv:1507.07503 · doi:10.1093/mnras/stv1715
Abstract
We investigate the star-formation rate (SFR) and stellar mass () relation of a star-forming (SF) galaxy sample in the XMM-LSS field to using the near-infrared data from the VISTA Deep Extragalactic Observations (VIDEO) survey. Combining VIDEO with broad-band photometry, we use the SED fitting algorithm CIGALE to derive SFRs and and have adapted it to account for the full photometric redshift PDF uncertainty. Applying a SF selection using the D4000 index, we find evidence for strong evolution in the normalisation of the SFR- relation out to and a roughly constant slope of (SFR ) to . We find this increases close to unity toward . Alternatively, if we apply a colour selection, we find a distinct turnover in the SFR- relation between at the high mass end, and suggest that this is due to an increased contamination from passive galaxies. We find evolution of the specific SFR at 10.5, out to with an observed flattening beyond 2 with increased stellar mass. Comparing to a range of simulations we find the analytical scaling relation approaches, that invoke an equilibrium model, a good fit to our data, suggesting that a continual smooth accretion regulated by continual outflows may be a key driver in the overall growth of SFGs.
19 pages, 18 figures, accepted for publication in MNRAS
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