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Fig. 13


Color map showing the distribution of line width determined by simultaneously fitting the emission of ten unblended, vibrationally excited transitions of CH3CN with the XCLASS package (see Sect. 3 for details). The field of view corresponds with the area of the HC HII region in G24.78+0.08 A1N. The black contours reproduce the JVLA A-Array 1.3 cm continuum (plotting the same levels as in Fig. 4, upper panel). The magenta contour represents the level of FWHM = 7 km s−1, and delimites the local maximum in line width LW-CS. The white dots mark the channel peak positions of the H30α line emission, and the dashed black line marks the axis of their spatial distribution. The cyan triangles and yellow squares have the same meaning as in Fig. 9.

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