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Feedback from active galactic nuclei (AGN) has become established as afundamental process in the evolution of the most massive galaxies. Its impacton Milky Way (MW)-mass systems, however, remains comparatively unexplored. Inthis work, we use the Auriga simulations to probe the impact of AGN feedback onthe dynamical and structural properties of galaxies, focussing on the bar,bulge, and disc. We analyse three galaxies -- two strongly and oneunbarred/weakly barred -- using three setups: (i) the fiducial Auriga model,which includes both radio and quasar mode feedback, (ii) a setup with no radiomode, and (iii) one with neither the radio nor the quasar mode. When removingthe radio mode, gas in the circumgalactic medium cools more efficiently andsubsequently settles in an extended disc, with little effect on the inner disc.Contrary to previous studies, we find that although the removal of the quasarmode results in more massive central components, these are in the form ofcompact discs, rather than spheroidal bulges. Therefore, galaxies withoutquasar mode feedback are more baryon-dominated and thus prone to formingstronger and shorter bars, which reveals an anti-correlation between theejective nature of AGN feedback and bar strength. Hence, we report that theeffect of AGN feedback (i.e. ejective or preventive) can significantly alterthe dynamical properties of MW-like galaxies. Therefore, the observed dynamicaland structural properties of MW-mass galaxies can be used as additionalconstraints for calibrating the efficiency of AGN feedback models.

The effects of AGN feedback on the structural and dynamical properties of Milky Way-mass galaxies in cosmological simulations