Fig. 1
Left: Spitzer two-color images (8 μm in red and 24 μm in green) of the infrared dust bubble N18 (infrared counterpart of Sh2-48). The white box indicates the region mapped with ASTE, which includes the BRC. The position of the ionizing star BD-14 5014 is shown. Red and green scales go from 60 to 160 MJy/sr and from 35 to 350 MJy/sr, respectively. Right: Hα image of the H ii region Sh2-48 as obtained from the Super COSMOS H-alpha Survey (SHS). A close-up view of the BRC is shown where the features A and B are indicated. The scale goes from 2600 (white) to 10 000 R (black).
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