Neutral gas winds of MaNGA-DR15 galaxies

We find evidence for neutral outflows in 127 galaxies (~5 per cent of the analysed line-emitting sample). Na I D winds are preferentially seen in galaxies with dustier central regions and both wind phases are more often found in systems with elevated star formation rate (SFR) surface densities, especially when there has been a recent upturn in the star formation activity according to the SFR_5Myr_ / SFR_800Myr_ parameter.

We find the ionized outflow kinematics to be in line with what we measure in the neutral phase. This demonstrates that, despite their small contributions to the total outflow mass budget, there is value to collecting empirical measurements of the ionized wind phase to provide information on bulk motion in the outflow. Depending on dust corrections applied to the ionized gas diagnostics, the neutral phase has ~1.2-1.8 dex higher mass outflow rates (dM/dt_out_), on average, compared to the ionized phase.