Cosmological Galaxy Evolution with Superbubble Feedback I: Realistic
  Galaxies with Moderate Feedback
  We present the first cosmological galaxy evolved using the modern smoothed
particle hydrodynamics (SPH) code GASOLINE2 with superbubble feedback. We show
that superbubble-driven galactic outflows powered by Type II supernovae alone
can produce $\rm{L^*}$ galaxies with flat rotation curves with circular
velocities $\sim 200\; \rm{km/s}$, low bulge-to-disc ratios, and stellar mass
fractions that match observed values from high redshift to the present. These
features are made possible by the high mass loadings generated by the
evaporative growth of superbubbles. Outflows are driven extremely effectively
at high redshift, expelling gas at early times and preventing overproduction of
stars before $z=2$. Centrally concentrated gas in previous simulations has
often lead to unrealistically high bulge to total ratios and strongly peaked
rotation curves. We show that supernova-powered superbubbles alone can produce
galaxies that agree well with observed properties without the need for
additional feedback mechanisms or increased feedback energy. We present
additional results arising from properly modelled hot feedback.
