Triggered star formation in giant HI supershells: ionized gas
  We considered the regions of triggered star formation inside kpc-sized HI
supershells in three dwarf galaxies: IC 1613, IC 2574 and Holmberg II. The
ionized and neutral gas morphology and kinematics were studied based on our
observations with scanning Fabry-Perot interferometer at the SAO RAS 6-m
telescope and 21 cm archival data of THINGS and LITTLE THINGS surveys. The
qualitative analysis of the observational data performed in order to highlight
the two questions: why the star formation occurred very locally in the
supershells, and how the ongoing star formation in HI supershells rims
influence its evolution? During the investigation we discovered the phenomenon
never observed before in galaxies IC 2574 and Holmberg II: we found faint giant
(kpc-sized) ionized shells in H-alpha and [SII]6717,6731 lines inside the
supergiant HI shells.
