Measurements of the Expansion Velocities of Ionized-Gas Superbubbles in
  Nearby Galaxies Based on Integral Field Spectroscopy Data
  The study of the dynamic properties of bubbles in the interstellar medium is
important for understanding the feedback mechanisms from star-formation
processes in galaxies. The ongoing integral field spectroscopy of nearby
star-forming galaxies reveals many expanding bubbles and superbubbles
identified by the local increase in gas velocity dispersion. The limited
angular resolution often prevents bona fide measures of the expansion
velocities in galaxies outside the Local Group, even despite sufficient
spectroscopic resolution. We present a method that makes it possible to measure
the expansion velocity of bubbles surrounding massive stars and clusters based
on the data about local variations in gas velocity dispersion. We adapt the
method for the Fabry-Perot interferometers used with the 6-m telescope of the
Special Astrophysical Observatory of the Russian Academy of Sciences, as well
as for any integral field spectrograph with a Gaussian line spread function. We
apply the method described to analyze the kinematics of ionized superbubbles
gas and the only known supernova remnant in the IC 1613 galaxy. The estimate of
the kinematic age of the supernova remnant (on the order of 3100 years) agrees
well with the previously obtained independent estimate based on X-ray data.
