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The intrinsic correlations of galaxy shapes and orientations across thelarge-scale structure of the Universe are a known contaminant to weakgravitational lensing. They are known to be dependent on galaxy properties,such as their mass and morphologies. The complex interplay between alignmentsand the physical processes that drive galaxy evolution remains vastlyunexplored. We assess the sensitivity of intrinsic alignments (shapes andangular momenta) to Active Galactic Nuclei -AGN- feedback by comparing galaxyalignment in twin runs of the cosmological hydrodynamical Horizon simulation,which do and do not include AGN feedback respectively. We measure intrinsicalignments in three dimensions and in projection at z=0 and z=1. We find thatthe projected alignment signal of all galaxies with resolved shapes withrespect to the density field in the simulation is robust to AGN feedback, thusgiving similar predictions for contamination to weak lensing. The relativealignment of galaxy shapes around galaxy positions is however significantlyimpacted, especially when considering high-mass ellipsoids. Using a sample ofgalaxy "twins" across simulations, we determine that AGN changes both thegalaxy selection and their actual alignments. Finally, we measure thealignments of angular momenta of galaxies with their nearest filament. Overall,these are more significant in the presence of AGN as a result of the higherabundance of massive pressure-supported galaxies.

The impact of AGN feedback on galaxy intrinsic alignments in the Horizon simulations