ИСТИНА

Giant low surface brightness galaxies (gLSB) with radii of discs as large as 100 kpc challenge galaxy formation scenarios. It is still not well understood how they form, evolve and transform through the cosmic time. Here we present analysis of deep spectral long-slit observations of the largest sample of these galaxies up to date. We derived spatially resolved properties of stellar and ionized gas kinematics. We revealed the presence of counter-rotating kinematical components in the inner region of UGC1922. In UGC1382 the counter-rotation of the gaseous disc is global. Our results suggest that there is a need for diversity of gLSBs formation scenarios: (i) some of them could have formed by in-plane mergers of massive galaxies; (ii) for some others the major merger scenario is excluded by our data.