Scaling Relations of Starburst-Driven Galactic Winds
  Using synthetic absorption lines generated from 3D hydro-dynamical
simulations we explore how the velocity of a starburst-driven galactic wind
correlates with the star formation rate (SFR) and SFR density. We find strong
correlations until the scaling relations flatten abruptly at a point set by the
mass loading of the starburst. Below this point the scaling relation depends on
the temperature regime being probed by the absorption line, not on the mass
loading. The exact scaling relation depends on whether the maximum or mean
velocity of the absorption line is used. We find that the outflow velocity of
neutral gas is four to five times lower than the average velocity of the
hottest gas, with the difference in velocity between the neutral and ionized
gas increasing with gas ionization. Thus, absorption lines of neutral or low
ionized gas will underestimate the outflow velocity of hot gas, severely
underestimating outflow energetics.
