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We study how feedback influences baryon infall onto galaxies usingcosmological, zoom-in simulations of haloes with present mass$M_{vir}=6.9\times10^{11} M_{\odot}$ to $1.7\times10^{12} M_{\odot}$. Startingat z=4 from identical initial conditions, implementations of weak and strongstellar feedback produce bulge- and disc-dominated galaxies, respectively.Strong feedback favours disc formation: (1) because conversion of gas intostars is suppressed at early times, as required by abundance matchingarguments, resulting in flat star formation histories and higher gas fractions;(2) because 50% of the stars form in situ from recycled disc gas with angularmomentum only weakly related to that of the z=0 dark halo; (3) becauselate-time gas accretion is typically an order of magnitude stronger and hashigher specific angular momentum, with recycled gas dominating over primordialinfall; (4) because 25-30% of the total accreted gas is ejected entirely beforez~1, removing primarily low angular momentum material which enriches the nearbyinter-galactic medium. Most recycled gas roughly conserves its angularmomentum, but material ejected for long times and to large radii can gainsignificant angular momentum before re-accretion. These processes lower galaxyformation efficiency in addition to promoting disc formation.

Why stellar feedback promotes disc formation in simulated galaxies