Fig. 5

Radio spectral index (i.e. ) of galaxies as a function of
Δlog (SSFR)MS, as derived from our
stacking analysis. Hatched areas represent the regions of parameter space affected
by incompleteness (see text and Fig. 3). In
each panel, we give the median value (see also the green lines), the Spearman rank
correlation (ρs) and the null hypothesis
probability (Sig.) derived from data points in the region of parameter space not
affected by incompleteness. Red dashed lines correspond to the canonical
radio spectral index of 0.8 observed in local star-forming galaxies (Condon 1992) and high-redshift SMGs (Ibar et al. 2010). Shaded regions show the range
of
values (i.e. 0.7 ± 0.4) observed by Ibar et al. (2009) in a population of sub-mJy
radio galaxies. Vertical solid and dot-dashed lines show the localisation and width
of the MS of star formation. In the range of redshift and Δlog (SSFR)MS probed here,
does not significantly deviate from
its canonical value, 0.8.
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