The energetics of starburst-driven outflows at z=1 from KMOS
  We present an analysis of the gas outflow energetics of 529 main-sequence
star-forming galaxies at z~1 using KMOS observations of the broad, underlying
H-alpha and forbidden lines of [N II] and [S II]. Based on the stacked spectra
for a sample with median star-formation rates and stellar masses of SFR ~ 7
Mo/yr and M* = (1.0+/-0.1)x10^10 Mo respectively, we derive a typical mass
outflow rate of dM/dt = 1-4 Mo/yr and a mass loading of dM/dt/SFR = 0.2--0.4.
The mass loading of the wind does not show a strong trend with star-formation
rate over the range SFR ~ 2--20 Mo/yr, although we identify a trend with
stellar mass such that dM/dt/SFR ~ M*^(0.26+/-0.07). Finally, we find that the
line width of the broad H-alpha increases with disk circular velocity with a
sub-linear scaling relation FWHM_broad ~ v^(0.21+/-0.05). As a result of this
behavior, in the lowest mass galaxies (M* < 10^10 Mo), a significant fraction
of the outflowing gas should have sufficient velocity to escape the
gravitational potential of the halo whilst in the highest mass galaxies (M* >
10^10 Mo) most of the gas will be retained, flowing back on to the galaxy disk
at later times.
