Fig. 2
Examples of three bubbles that are small in angular size. All the fields are 5′ × 5′. Turquoise is the Spitzer-GLIMPSE images at 8.0 μm, which defines the bubbles. Red is the Spitzer-MIPSGAL emission at 24 μm from hot dust (top row) or MAGPIS 20-cm radio continuum emission from the ionized gas (bottom row). Directions in which both the 8 μm and 24 μm emission (or both the 8 μm and radio emission) are present appear in white, independent of the intensity of the emission. Equivalent images for the entire sample are available online.
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