Outflow dynamical timescale corrected for a mean projection angle of 57.3°, tdyn, corr, vs. mass of the launching core, Mcore (a) and the visual extinction of the cloud background crossed by the outflow, AV (b). The dynamical timescale of a given core is evaluated in two ways: as the oldest ejection event (triangles) and as the Lmax ∕ΔVmax ratio (squares). Both dynamical timescales are plotted in (a), showing that they are generally consistent within errorbars. A single estimate is used in (b), which corresponds to the oldest ejection event (triangles) when it can be measured and the Lmax ∕ΔVmax ratio otherwise (squares). No significant correlation is observed in (a). The anti-correlation between tdyn and AV in (b), with α = −0.7 ± 0.1 (magenta line) and a Pearson correlation coefficient of −0.67, is reminiscent of that between Lmax and AV in Fig. 8b.
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