ИСТИНА

The aim of this work is to design a coherent picture of the exotic galaxy Malin 2 belonging to the class of low surface brightness galaxies that is expected to have disc properties like peripheries of normal spirals. One of the unique its peculiarities is the apparent misbalance of interstellar media, namely, the molecular gas excess in relation to atomic gas for given values of the gas equilibrium turbulent pressure. We discuss that it can be explained by the presence of a significant portion of the dark gas unobserved by CO lines and 21 cm. We also argue that the massive and rarefied dark halo which formed before the disc component describes all the observed properties of Malin 2 well and we find that there is no need to assume additional catastrophic scenarios (such as major merging) proposed previously in order to explain the origin of giant LSB galaxies.