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Fig. 1

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Spitzer/IRAC 8 μm images of the clumps and filaments studied in the present paper. The images are shown with logarithmic scaling, and the colour bars indicate the surface-brightness scale in MJy sr-1. The images are overlaid with contours of LABOCA 870 μm dust continuum emission as in Paper I (starting from 3σ and going in steps of 3σ, where 3σ is 0.27, 0.18, 0.12, and 0.14 Jy beam-1 for fields G1.87, G2.11, G11.36, and G13.22, respectively). The 870 μm peak positions of the clumps are denoted by yellow plus signs. In each panel, a scale bar indicating the 1 pc projected length is shown, with the assumption of line-of-sight distance given in Col. (4) of Table 1. The source nomenclature follows that in Paper I. The clumps G1.87−SMM 10, 17, and G13.22−SMM 10 are only partly covered by the MALT90 maps. The white plus sign towards G2.11−SMM 5 shows the position of the UC H ii region from Becker et al. (1994; as seen at 5 GHz) and the 18 cm OH maser from Argon et al. (2000); the two positions overlap, and are very close to the 870 μm peak position.

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