Fig. 7

Exchanges on the galaxy scale. The galaxy scale is considered as an intermediate scale. A galaxy can be made of two different parts, a disc and a bulge ℬ. The fresh gas (Ṁff and
), coming from the cold and the hot reservoirs, only feeds the disc component. The bulge component is created during a merger or by the clump migration process. SNe and the activity of the SMBH produce ejecta (Mwind). These ejecta are considered at an upper scale (see Fig. 3). The gas exchanges associated with the disc and the bulge are described in Figs. 8 and 11.
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