ИСТИНА

The HI distribution in disks of nearby galaxies reveals a number of so-called supergiant shells (SGSs) with sizes of 1-3 kpc, which most probably were formed by stellar winds and supernova explosions from multiple star formation events. The ongoing star formation take place in a part of such SGSs. We performed a multiwavelength analysis of the sites of star formation in the rims of SGSs of several nearby irregular galaxies. The observations with a scanning Fabry-Perot interferometer in Hα line at 6-m SAO RAS telescope allowed us to investigate the ionized gas kinematics of the studied regions in details. Our observations demonstrate a complicated picture of star formation in some of SGSs: a kpc-sized bounded complexes of HII regions, filaments and expanding ionized superbubbles that were formed by feedback of massive stars from young star clusters. In two galaxies we found the largest ionized superbubbles ever known - with sizes of 1.5 kpc. We showed that the star formation inside SGSs could be triggered by their collision. In turn, the ongoing star formation affects the evolution of the 'parent' HI SGS.