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Table 4

CH3CN, CHCN, and CH3CN (19–18) v8 = 1 line parameters toward core A.

Line V LSR FWHM TB dV
K (km s-1) (km s-1) (K) (K km s-1)

CH3CN

0 47.8±0.2 9.4±0.2 9.1 ±1.5 91 ±9
1 " " 11.6±1.5 116 ±8
2 " " 10.9±1.5 109 ±6
3 " " 10.0±1.5 100 ±6
4 " " 8.7 ±1.5 87 ±6
5 " 9.4±0.2b 6.5 ±1.3 67 ±9
6 " " 7.0 ±1.3 70 ±9
7 " " 3.0 ±1.3 30 ±9
8 " " 2.2 ±1.3 22 ±9
9 " " 3.0 ±1.3 28 ±9

CHCNc

2 47.7±0.4 9.4±0.2b 0.7±0.9 7.3 ±8.7
3 " " 1.5±0.9 15.4±11
4 " " 0.8±0.9 7.5 ±8.7

CH3CN v8 = 1

(2, 1) 46.8 ± 0.5 8.0±0.2b 1.9±0.4 16.5±3.4
(3, 1) " " 1.8±0.4 15.6±3.4
(4, 1) " " 2.2±0.4 18.9±3.4
(1, 1) " " 1.8±0.4 15.8±5.5
(0, 1) " " 2.3±0.4 20.0±5.5
(2, 1) " " 3.1±0.3 26.3±4.5
(5, 1) " " 1.5±0.3 13.0±5.1
(3, 1) " " 1.1±0.3 9.6 ±3.5
(6, 1) " " 0.8±0.3 7.1 ±3.5
(4, 1) " " 2.1±0.8 17.8±4.0
(7, 1) " " 1.5±0.7 13.0±4.1
(5, 1) " " 1.2±0.6 10.0±3.4
(8, 1) " " 0.2±0.4 1.7 ±3.2
(1, 1) " " 1.8±0.2 15.4±4.0
(6, -1) " " 0.4±0.2 3.5 ±4.1

Notes.

(a)

Brightness temperature integrated over a 3σ emission level area.

(b)

This parameter was held fixed in the fit.

(c)

K = 0 and 1 are strongly blended with CH3CN K = 5, and it has not been possible to estimate their parameters.

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