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We present results of a high-resolution zoom cosmological simulation of theevolution of a low-mass galaxy with a maximum velocity of V=100 km/s at z=0,using the initial conditions from the AGORA project (Kim et al. 2014). Thefinal disc-dominated galaxy is consistent with local disc scaling relations,such as the stellar-to-halo mass relation and the baryonic Tully-Fisher. Thegalaxy evolves from a compact, dispersion-dominated galaxy into arotation-dominated but dynamically hot disc in about 0.5 Gyr (from z=1.4 toz=1.2). The disc dynamically cools down for the following 7 Gyr, as the gasvelocity dispersion decreases over time, in agreement with observations. Theprimary cause of this slow evolution of velocity dispersion in this low-massgalaxy is stellar feedback. It is related to the decline in gas fraction, andto the associated gravitational disk instability, as the disc slowly settlesfrom a global Toomre Q>1 turbulent disc to a marginally unstable disc (Q=1).

Formation and settling of a disc galaxy during the last 8 billion years in a cosmological simulation