Origin and Dynamics of Expanding Neutral Hydrogen Supershells.

摘要

The evolutionary model of expanding supershells regulated by induced star formation is proposed. It is suggested that giant expanding shells are formed in superclouds at late evolutionary stage of star complexes. To understand the dynamics of the largest supershells it is necessary to take into account that expanding shells can trigger star formation in cold dense pre-exosting cloudlets. Efficiency of induced star formation must be less than one percent to fit observational properties of supershells. 46 refs.; 6 figs. (Atomindex citation 19:094390)