3D simulations of globules and pillars formation around HII regions: turbulence and shock curvature

摘要: We investigate the interplay between ionization radiation from massive stars and turbulence inside surrounding molecular gas thanks to 3D numerical simulations. used hydrodynamical code HERACLES model an initial turbulent medium that is ionized heated by ionizing source. Three different simulations are performed with mean Mach numbers (1, 2 4). A non-equilibrium for associated thermal processes was used. This revealed be crucial when ram pressure of same order as ionized-gas pressure. The density structures initiated cause local curvatures dense shell formed compression. When curvature sufficient, collapse on itself form a pillar while smaller leads formation clumps accelerated therefore remain in during simulation. cold sufficient balance pressure, some dense-gas bubbles have enough kinetic energy penetrate medium, forming cometary globules. suggests direct relation observations presence globules relative importance compared probability functions present double peak structure low could indication clouds.