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Table 4

CH3CN lines data from IRAM 30 m spectra.

Freq. Eup log A gu Transition NGC 7538 IRS9 W3 IRS5 AFGL490
(GHz) (K) FdV FHWM FdV FHWM FdV FHWM
(Jy km s-1) (km s-1) (Jy km s-1) (km s-1) (Jy km s-1) (km s-1)

239.023 258.9 –3.00 54 135–125 1.6 ± 0.5 9 ± 2 <1.0 <1.5
239.064 194.6 –2.97 54 134–124 2.0 ± 0.7 9 ± 2 0.9 ± 0.3 6 ± 2 1.2 ± 0.4 6 ± 2
239.096 144.6 –2.95 108 133–123 5.3 ± 0.8 6.0 ± 0.3 2.2 ± 0.4 2.2 ± 0.2 2.4 ± 0.6 8 ± 1
239.120 108.9 –2.94 54 132–122 4.5 ± 0.7 5.7 ± 0.3 1.7 ± 0.4 2.8 ± 0.3 1.5 ± 0.5 6 ± 2
239.133 87.5 –2.93 54 131–121 5.8 ± 0.8 4.6 ± 0.2 2.4 ± 0.4 2.4 ± 0.2 2.1 ± 0.5 4.9 ± 0.5
239.138 80.3 –2.93 54 130–120 7.4 ± 1.0 5.2 ± 0.2 2.6 ± 0.4 2.1 ± 0.2 2.4 ± 0.5 5.4 ± 0.5

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