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Fig. A.2

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Top: grayscale of the 8 μm GLIMPSE image of GMF 20.0-17.9. The white contour shows the 13CO integrated intensity of 3.5 K km s-1. IRAS 18248-1229 and W 39 are both labeled with blue stars, and Hii regions from the CORNISH survey are marked with blue circles. The black line is the location of the Galactic plane at the distance of this filament. Bottom: color scale of the centroid velocity field from the GRS 13CO data where the integrated intensity is above 1 K km s-1 in the indicated velocity range, shown in the color bar in km s-1. The blue contour is ATLASGAL 870 μm emission of 250 mJy beam-1. In magenta circles, we show all vlsr measurements of BGPS clumps that have velocities within the 13CO velocity range and with × those vlsr values outside of the 13CO velocity range. The diamonds are positions in the Wienen et al. (2012) catalog with a matching velocity. The black contour is the 13CO integrated intensity at 3.5 K km s-1.

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