Description of source "g20" from Chambers et al. (2011)

Green sources g19 (Figure 19) and g20 (Figure 20) are located in close proximity to one another in the same IRDC complex toward the HII region RCW 141. Both sources are likely foreground to the Galactic center and are coincident with bright 24 µm emission. While g20 (7.3 ± 1.3 M_0) is not associated with any CH3OH maser, g19 (5.5 ± 1.3 M_0) is associated with a 6.7 GHz and a 44 GHz maser. The 6.7 GHz maser spectrum displays two bright features between 20 and 25 km s−1. It is located within the confines of the green source, ~2 arcsec from the center of its extended emission. The 44 GHz maser emission was detected ~14 arcsec from the green source, not directly on the 4.5 µm emission. This 44 GHz maser displays a single emission feature at 17 km s−1.