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Table 2
Temperatures and methyl cyanide column densities for IRc2 and the northeastern hot zone derived from analysis of the K-ladder emission lines.
| CH3CN | Rotation diagram | Population diagram | LVG model fit | ||||||
| J′ → J′′ | T rot | N beam | T rot | N source | T kin | N source | |||
| (K) | (1015 cm-2) | (K) | (1016 cm-2) | (K) | (1016 cm-2) | ||||
|
|
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| IRc2 (+ 0″, +0″) | |||||||||
|
|
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| 6K−5K | 495 | 14 | 260 | 20 | 270 | 7.9 | |||
| 12K−11K | 415 | 6.8 | 230 | 6.3 | 190 | 1.3 | |||
| 13K−12K | 329 | 4.9 | 220 | 6.3 | 270 | 1.6 | |||
| 14K−13K | 442 | 6.1 | 290 | 6.3 | 340 | 1.6 | |||
|
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| Hot zone peak | |||||||||
|
|
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| 6K−5K | 517 | 5.7 | 300 | 16 | 370 | 5.0 | |||
| 12K−11K | 415 | 1.4 | 550 | 6.3 | 260 | 2.0 | |||
| 13K−12K | 402 | 1.3 | 400 | 5.0 | 360 | 0.8 | |||
| 14K−13K | 476 | 0.4 | 510 | 5.0 | 460 | 1.0 | |||
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| Hot zone average | |||||||||
|
|
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| 6K−5K | 415 | 5.9 | 220 | 12 | 270 | 5.4 | |||
| 12K−11K | 313 | 1.7 | 250 | 4.7 | 200 | 1.1 | |||
| 13K−12K | 313 | 1.4 | 290 | 4.8 | 240 | 1.0 | |||
| 14K−13K | 418 | 1.2 | 360 | 5.2 | 350 | 1.0 | |||
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