M31's giant molecular clouds appear to be pressure-confined by the galactic mid-plane pressure and internally near hydrostatic equilibrium, with internal pressure scaling as surface density squared.
F., Lombardi, M., & Lada, C
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The Role of Pressure in the Structure and Stability of GMCs in the Andromeda Galaxy
M31's giant molecular clouds appear to be pressure-confined by the galactic mid-plane pressure and internally near hydrostatic equilibrium, with internal pressure scaling as surface density squared.