CLASSY III: The Properties of Starburst-Driven Warm Ionized Outflows
  We report the results of analyses of galactic outflows in a sample of 45
low-redshift starburst galaxies in the COS Legacy Archive Spectroscopic SurveY
(CLASSY), augmented by five additional similar starbursts with COS data. The
outflows are traced by blueshifted absorption-lines of metals spanning a wide
range of ionization potential. The high quality and broad spectral coverage of
CLASSY data enable us to disentangle the absorption due to the static ISM from
that due to outflows. We further use different line multiplets and doublets to
determine the covering fraction, column density, and ionization state as a
function of velocity for each outflow. We measure the outflow's mean velocity
and velocity width, and find that both correlate in a highly significant way
with the star-formation rate, galaxy mass, and circular velocity over ranges of
four orders-of-magnitude for the first two properties. We also estimate outflow
rates of metals, mass, momentum, and kinetic energy. We find that, at most,
only about 20% of silicon created and ejected by supernovae in the starburst is
carried in the warm phase we observe. The outflows' mass-loading factor
increases steeply and inversely with both circular and outflow velocity
(log-log slope $\sim$ -1.6), and reaches $\sim 10$ for dwarf galaxies. We find
that the outflows typically carry about 10 to 100% of the momentum injected by
massive stars and about 1 to 20% of the kinetic energy. We show that these
results place interesting constraints on, and new insights into, models and
simulations of galactic winds.
