Fig. 11
N12: left: colour image with the Spitzer-GLIMPSE image at 8 μm in turquoise and the Spitzer-MIPSGAL image at 24 μm in red. This bubble appears, at first glance, to be rather circular; but the ionization front that limits the central cavity shows many structures. This is indicative of density inhomogeneities in the medium surrounding the bubble. Right: synthetic optical image of a simulated H ii region evolving in a turbulent molecular cloud (Henney et al. 2010). The [NII] 6584 Å emission appears in red, the Hα 6563 Å emission in green, and the [OIII] 5007 Å emission in blue.
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