ИСТИНА

Stellar feedback is important process regulating ISM morphology and kinematics: cumulative action of winds and ionizing radiation from massive stars with a following supernova explosions blow out superbubbles having sizes from a few pc to several kpc. This process is especially important in dwarf irregular galaxies, which thick gaseous disk and lack of the density waves allow such structures to live longer and grow to larger sizes than in spiral galaxies. The interaction of the giant HI supershells might trigger a new burst of star formation in a galaxy, while the influence of ongoing star formation in their rims might lead to dissolution of the HI structures. In our ongoing survey with a scanning Fabry-Perot interferometer at the Russian 6-m telescope we study the gas morphology, kinematics and young stellar population in star-forming regions of nearby dwarf irregular galaxies. We identified and analyzed several tens of the ionized superbubbles; certain signs of propagating star formation were found. We argue that at least in several galaxies the collision of the giant kpc-sized supershells plays important role in the triggering of a new burst of star formation.