VALES VIII. Weak ionized gas outflows in star-forming galaxies at z similar to 0.15 traced with VLT/MUSE

We characterize the ionized gas outflows in 15 low-redshift star-forming galaxies, a Valparaiso ALMA/APEX Line Emission Survey (VALES) subsample, using MUSE integral field spectroscopy and GAMA photometric broadband data. We measure the emission-line spectra by fitting a double-component profile, with the second and broader component related to the outflowing gas. This interpretation is in agreement with the correlation between the observed star-formation rate (SFR) surface density (sigma(SFR)) and the second-component velocity dispersion (sigma(2nd)), expected when tracing the feedback component. By modeling the broadband spectra with spectral energy distribution fitting and obtaining the star-formation histories of the sample, we observe a small decrease in SFR between 100 and 10 Myr in galaxies when the outflow H alpha luminosity contribution is increased, indicating that the feedback somewhat inhibits the star formation within these timescales. The observed emission-line ratios are best reproduced by photoionization models when compared to shock ionization, indicating that radiation from the young stellar population is dominant and seems to be a consequence of a continuous star-formation activity instead of a "bursty" event. The outflow properties, such as the mass outflow rate (similar to 0.1M(circle dot) yr(-1)), the outflow kinetic power (similar to 5.2 x 10(-4)%L-bol), and the mass loading factor (similar to 0.12), point toward a scenario where the measured feedback is not strong and has a low impact on the evolution of galaxies in general.