Description of source "g22" from Chambers et al. (2011)

Another example of an extended green source embedded within an IRDC, g22 is likely located foreground to the Galactic center near an HII complex. The enhanced 4.5 µm emission is coincident with both 24 µm emission and a 6.7 GHz maser (Figure 22). The maser has a single, bright emission feature at −0.8 km s−1, and is located directly on the green region that defines the source, close to the peak of the 24 µm emission. Source g22 has a mass of 4.9 ± 1.8 M_0 and is not associated with any 44 GHz maser emission.