ИСТИНА

We present observations and analysis of two dwarf Irr galaxies in M81 group - IC 2574 and Holmberg II. Their 21 cm images of these galaxies show multiple shell-like structures with sizes up to 1-2 kpc, so-called supergiant shells (SGS), most probably created by stellar feedback from several generations of stars. According to modern understanding the SGS expansion triggers new bursts of star formation in their rims. This is what one can see in IC 2574 and Holmberg II - most active star formation regions are located on the edges of SGSs. Using our observational data in H-alpha and [SII] lines obtained with Fabry-Perot Interferometer at the 6-m telescope of Russian Academy of Science and archival data in HI 21 cm from THINGS survey we provided the detailed study of ionized and neutral gas kinematics in the two galaxies. We estimated expansion velocities of multiple shell-like structures and correlate them with the energy sources responsible for their creation. We considered how the induced star formation influences the kinematics of parent HI SGS.