Gas engaged in noncircular motions in LITTLE THINGS dwarf irregular
  galaxies
  We have examined gas engaged in noncircular motions in 22 of the nearby
LITTLE THINGS dwarf irregular galaxies. The HI data cubes have been deconvolved
into kinematic components - bulk rotation and noncircular motions, to produce
maps of integrated gas, velocity field, and velocity dispersion in the
different components. We found significant regions of gas engaged in
noncircular motions in half of the galaxies, involving 1%-20% of the total HI
mass of the galaxy. In one galaxy we found a pattern in the velocity field that
is characteristic of streaming motions around the stellar bar potential and
star formation at the end of bar. Two galaxies have large-scale filamentary
structures found in their outer disks, and these filaments could be transient
instabilities in the gas. We found no spatial correlation between noncircular
motion gas and enhanced star formation. We found noncircular motion gas in only
one galaxy associated with higher HI velocity dispersion.
