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Fig. A.1

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Top: grayscale GLIMPSE 8 μm image of the GMF 307.2-305.4. The blue contours show the 13CO integrated intensity of 2 K /km s-1, integrated over the velocity range [–45, –25] km s-1. The red contours show the ATLASGAL emission at a contour level of F870 μm = 250 mJy/beam. The filled geometric objects show all the dense gas measurements from different surveys with vLSR within the velocity range indicated in Table 2. Gray diamonds show MALT90 (Foster et al. 2011, 2013; Jackson et al. 2013) survey measurements, yellow circles belong to the spectral catalog of H ii regions in the WISE survey (Anderson et al. 2014), The RMS survey (Lumsden et al. 2013) is represented by green triangles, the cyan squares show NH3 clumps from HOPS survey (Purcell et al. 2012), and the pink hexagons show spectral follow-ups of the ATLASGAL survey (Giannetti et al. 2014; Urquhart et al. 2013, 2014). Middle: position-velocity diagram of the 13CO line of the GMF 307.2-305.4, obtained from a slice following the extinction feature (black line in top panel) used to identify GMF 307.2-305.4. Bottom: PV diagram of the 12CO emission between | b | ≤ 1°. The yellow line shows GMF 307.2-305.4 in the PV space. The green solid line shows the Scutum-Centaurus arm as predicted by Reid et al. (2014) and the dashed green lines show ±10 km s-1 of the velocity of the spiral arm.

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