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\subsection{stellar \subsection{AGN  feedback in galaxies and galaxy mergers to binary supermassive black holes} galaxies}  Feedback encompasses a wide range of astrophysics, including radiation from stars heating and ionizing surrounding gas, thermal and kinetic energy injection from supernova explosions, heating from active galactic nuclei (AGN), and the impact of AGN jets. These processes can drive galactic winds, blowing gas out of galaxies, and slowing down star formation. Although SMBH have been suggested as a highly efficient mechanism for regulating star formation in galaxies, (Borys et al, 2005) suggest that observational evidence for feedback, in particular due to SMBH activity, is scarce.