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Baryonic feedback is expected to play a key role in regulating the star formation of low-mass galaxies by producing galaxy-scale winds associated with mass-factors (β) of 1−50. We test this prediction in galaxies from the "DWarf galaxies Archival Local survey for Interstellar medium investigatioN" (DWALIN) sample using archival MUSE@VLT data.

Ionised gas in DWALIN galaxies is characterised by irregular velocity fields, indicating the presence of non-circular motions of a few tens of km/s within galaxy discs, but with intrinsic velocity dispersion that is only marginally larger than that measured in main-sequence galaxies. 

Only a few per cent of the ionised gas flux is found at velocities larger than the escape speed. Mass outflow rates and loading factors are strongly dependent on galaxy properties (stellar mass, SFR density, specific SFR), but the typical value of β is 0.02, which is more than two orders of magnitude smaller than that predicted by theoretical models of galaxy evolution.

In DWALIN, baryonic feedback stimulates a gentle gas cycle rather than causing a large-scale blow-out.

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