Supersonic turbulence in giant HII regions: clues from 30 Doradus

The tight correlation between turbulence and luminosity in giant HII regions (GHRs) is not well understood. While the due to UV radiation from massive stars ionizing clusters, it clear what powers turbulence. Observations of two prototypical GHRs local Universe, 30 Doradus NGC 604, show that part kinetic energy nebular gas comes combined stellar winds most stars, cluster winds, but all. We present a study kinematics based on archival VLT FLAMES/GIRAFFE data new high-resolution observations with HARPS. find structure are shaped by hot wind individual stars. gas, small contribution gravitational potential gas. estimate total mass we argue region does contain significant amounts neutral (HI) molecular cloud Dor-10, which close center nebula projection, fact an inflating tens parsecs away R136, core cluster. rule out Kolmogorov-like turbulent cascade as source supersonic GHRs.