Visibility moments and power spectrum of turbulence velocity
  Here we introduce moments of visibility function and discuss how those can be
used to estimate the power spectrum of the turbulent velocity of external
spiral galaxies. We perform numerical simulation to confirm the credibility of
this method and found that for galaxies with lower inclination angles it works
fine. This is the only method to estimate the power spectrum of the turbulent
velocity fluctuation in the ISM of the external galaxies.
