Recent cosmological simulations have shown that feedback from supernovae and AGN is the crucial ingredient to produce a galaxy population with realistic sizes and morphologies. Based on findings from the cosmological galaxy formation simulations Illustris and IllustrisTNG, I will discuss the role of galactic feedback in regulating the baryonic angular momentum content of haloes, whose gas content serves as gas reservoir for the central galaxy. I will touch on the role of feedback driven galactic fountain flows in extracting high angular momentum gas from the halo CGM, leading to the growth of a galactic disc. The resulting angular momentum vectors of spiral galaxies furthermore are believed to align the orientations of neighbouring spiral galaxies resulting in a contamination of the weak lensing signal used by e.g. the Euclid satellite to measure the dark energy equation of state. I will discuss the theory of these so called ‘intrinsic alignments’ for both spiral and elliptical galaxies and confront them with the signal measured directly from IllustrisTNG.
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 Jolanta Zjupa.pdf | 4.31 MB |