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We use the most extensive integral field spectroscopic map of a local galaxy, 628, combined with gas and stellar mass surface density maps, to study the of metals in this galaxy out to 3 effective radii (\ Rₑ). At galactocentric distance, we compute the metal budget and thus constrain mass of metals lost. We find that in the disc about 50% of the metals have lost throughout the lifetime of the galaxy. The fraction of metals lost is in the bulge (\70%) and decreases towards the outer disc (\ \3 \\ Rₑ). In contrast to studies based on the gas kinematics, which are only to ongoing outflow events, our metal budget analysis enables us to the average outflow rate during the galaxy lifetime. By using simple motivated models of chemical evolution we can fit the observed metal at most radii with an average outflow loading factor of order unity, clearly demonstrating the importance of outflows in the evolution of disc of this mass range (\ log (M_\/M_\) \ 10). The observed phase metallicity is higher than expected from the metal budget and late-time accretion of enriched gas, likely raining onto the disc from metal-enriched halo.
Belfiore et al. (Tue,) studied this question.