ИСТИНА

We investigate physical properties of molecular clouds in simulated Milky Way-size disc galaxies with different morphologies. In our N-body/hydrodynamical simulations we include non-equilibrium H2 and CO chemical kinetics, self-gravity, star formation and feedback processes. For these simulated galaxies the scaling relations for giant molecular clouds (GMCs), or so called Larson's relations, are studied for two types of cloud definition criterion (total column density threshold and CO integrated intensity threshold). We argue that the population of clouds obtained using the definition based on integrated intensity threshold is more homogeneous in physical conditions (molecular fraction, temperature, density and etc.). We discuss how feedback and ionisation processes influence on the virial state and PDF of clouds in various galactic environment (spirals, bar, inter arm regions etc).