Cloud Implosion and Star Formation(Proceedings of Japan-France Seminar on Chemical Evolution of Galaxies with Active Star Formation)

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The evolution of the molecular gas cloud embedded in an HII region is studied. We consider a spherical, uniform, and stable molecular gas cloud, which is exposed to strong ionizing radiation from nearby massive stars. The gas cloud is strongly compressed by the surrounding high pressure ionized gas and a shock wave is formed. The shock compressed gas forms a shell which converges toward the center of the cloud sweeping up the inner material. As the shell accumulates the swept up gas, it becomes gravitationally unstable. The growth time of the instability is less than the time scale of the whole collapse of the cloud. Thus, the shell will break into fragments before it reaches the center of the cloud, leading to formation of a stellar association or a cluster.Molecular gas cloudHII regionimplosionfragmentation
1987-03-20