On the Role of Molecular Hydrogen in Formation and Evolution of Blue Compact Dwarf Galaxies and Giant HII-Regions
The universal mechanism controlling the thermal evolution of the gas clouds, namely the molecular hydrogen formation, is found. The cloud is effectively cooled from temperature T ≃ 104 K down to T <103 K. The principal possibility has been shown to exist for the blue compact dwarf galaxies formation from matter with primeval chemical composition. In the galaxies with large heavy element abundances Z > 0.2 Zο the star formation regions fragment on the clouds with masses M ≃ 103 − 105 M⊙ due to thermal instability. The star formation regions in the galaxies with Z < 0.2 Z⊙ are more homogeneous and have the masses ≃ 106 − 107 M⊙.
KeywordsStar Formation Molecular Hydrogen Heavy Element Massive Star Globular Cluster
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