Fig. 6
Comparison between the CRRLs observed in absorption and the 158μm-[CII] line. The blue steps show the C351α line profile inverted (from the LOFAR observations in 2014), the green steps the C280α line inverted (from the GBT observations AGBT02A_028), and the red steps show the 158μm-[CII] line (from the SOFIA observations of Pabst et al. 2019). The CRRLs trace a fainter velocity component in the 158μm-[CII] line due to the effect of stimulated emission. The dotted lines in the lower panel show the best fit Gaussian line profiles used to decompose the 158μm-[CII] line (the properties of these components are given in Table 3). The spectra are the spatial average over a circle 36′ in diameter centered on M 42.
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