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Fig. 4

image

Evolution of the sSFR with redshift for VUDS star-forming galaxies, obtained by computing the median sSFR value for M ≥ 5 × 109M when z ≤ 1.5 and M ≥ 1010M for z> 1.5. Error bars on each VUDS data point indicate the 1σ error on the median of the observed sSFR distribution and are generally smaller than the size of the data points. For the points at z = 3.9 and z = 4.8 flags 2, 3, 4, and 9 have been included to increase the sample size, and we also indicate the median values for flags 3 and 4 only, represented by the coloured squares that lie at only slightly lower values (almost undistinguishable for z = 3.9). At z< 2.4 we find that the sSFR evolution follows (1 + z)2.8, while the evolution is slower at 2.4 <z< 5 following (1 + z)1.2 (dotted line). The ± 1σ of the sSFR distribution is represented by the light grey short dash – long dash lines below and above the median values. Several other datasets from the literature are plotted as discussed in the text (Reddy et al. 2012; Bouwens et al. 2012; SFGs from Fumagalli et al. 2013; Stark et al. 2013; Gonzalez et al. 2014); some of these points have been slightly shifted to avoid overlap with the VUDS data points, see the exact values in these papers. Several models predicting the evolution of the sSFR are indicated, including galaxy growth dominated by cold gas accretion (Dekel et al. 2009, dashed line, normalized to sSFR(z = 0) = 0.1), the hydrodynamical simulation of Davé et al. (2011, dot-dashed line), and the latest results from the Illustris hydrodynamical simulation (Sparre et al. 2014, long-dashed line).

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