Fig. 15

A possible IRDC-like source on the far-side of the Galaxy. This source is cold (~20 K), has high column density (~3 × 1022 cm-2) and is amidst the bright mid-IR Galactic Plane at (ℓ, b) = (30.01, −0.27). By these measures, it should be an IRDC, but the 8 μm image (top right) shows only a moderate decrement and the near-side extinction column density is almost an order of magnitude less than expected from the far-IR column density. This source breaks up into a Northern (ℓ, b) = (30.003, −0.266) and Southern (ℓ, b) = (30.009, −0.274) component at the higher resolution of the PACS 70 μm band. This source is a great candidate for further study.
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