The Lyman Alpha Reference Sample XI: Efficient Turbulence Driven
  Ly{\alpha} Escape and the Analysis of IR, CO and [C II]158 {\mu}m
  We study the global dust and (molecular) gas content in the Lyman Alpha
Reference Sample (LARS), i.e. 14 local star-forming galaxies. We characterize
their interstellar medium and relate newly derived properties to quantities
relevant for Ly$\alpha$ escape. We observed LARS galaxies with Herschel/PACS,
SOFIA/FIFI-LS, the IRAM 30m telescope and APEX, targeting far-infrared (FIR)
continuum and emission lines of [C II]158$\mu$m, [O I]63$\mu$m, [O III]88$\mu$m
and low-J CO lines. Using Bayesian methods we derive dust model parameters and
estimate total gas masses for all LARS galaxies, taking into account a
metallicity-dependent gas-to-dust ratio. Star formation rates were estimated
from FIR, [C II]158$\mu$m and [O I]63$\mu$m luminosities. LARS covers a wide
dynamic range in the derived properties, with FIR-based star formation rates
from $\sim$0.5-100 $M_{\odot}\ yr^{-1}$, gas fractions between $\sim$15-80% and
gas depletion times ranging from a few hundred Myr up to more than 10 Gyr. The
distribution of LARS galaxies in the $\Sigma_{gas}$ vs. $\Sigma_{SFR}$
(Kennicutt-Schmidt plane) is thus quite heterogeneous. However, we find that
LARS galaxies with the longest gas depletion times, i.e. relatively high gas
surface densities ($\Sigma_{gas}$) and low star formation rate densities
($\Sigma_{SFR}$), have by far the highest Ly$\alpha$ escape fraction. A strong
$\sim$linear relation is found between Ly$\alpha$ escape fraction and the total
gas (HI+H$_2$) depletion time. We argue that the Ly$\alpha$ escape in those
galaxies is driven by turbulence in the star-forming gas that shifts the
Ly$\alpha$ photons out of resonance close to the places where they originate.
We further report on an extreme [C II]158$\mu$m excess in LARS 5, corresponding
to $\sim$14$\pm$3% of the FIR luminosity, i.e. the most extreme [C II]-to-FIR
ratio observed in a non-AGN galaxy to date.
