Fig. 6.

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Momentum exchange rate between the stellar population and an idealised thin-edged SB with constant expansion and contraction velocities vexp = 20 km s−1 and vcol = 10 km s−1, respectively, and expansion phase duration of 30 Myr. The ambient gas density is 0.015 M⊙ pc−3. The stellar density is 0.1 M⊙ pc−3, with a Maxwellian velocity distribution with σ = 25 km s−1. The relative velocity between the SB and the stellar distribution is vb = 10 km s−1. The solid line shows the semi-analytical solution given by Eq. (A.21); the symbols correspond to the full numerical solution.
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