Star clusters and the structure of the ISM: Tunnels and wakes in giant extragalactic H II regions

Several structures have been discovered embedded in regions of recent or on going star formation, which points to the importance of the interaction bet ween fast-moving, wind-blowing stars and their environment. Using hydrodyna mic simulations, we investigate the passage through the interstellar medium of a supersonic stellar wind source and show how it can naturally lead to the formation of tubes, channels, and swamps of globules as interfaces are crossed. The results are in excellent agreement with observation of 30 Dora dus.