Table 1
Properties of the observed lines.
| λ (μm) | Transition | ncrit (cm−3) | Eu/k (K) | Aij (s−1) | |
|---|---|---|---|---|---|
| CO | 649.7 | J = 4− 3 | 8 (04) | 55.3 | 6.13 (–06) |
| CO | 520.2 | J = 5− 4 | 2 (05) | 83.0 | 1.22 (–05) |
| CO | 433.6 | J = 6− 5 | 3 (05) | 116 | 2.14 (–05) |
| CO | 371.7 | J = 7− 6 | 4 (05) | 155 | 3.42 (–05) |
| CO | 325.2 | J = 8− 7 | 6 (05) | 199 | 5.13 (–05) |
| CO | 289.1 | J = 9− 8 | 8 (05) | 249 | 7.33 (–05) |
| CO | 260.2 | J = 10− 9 | 1 (06) | 304 | 1.01 (–04) |
| CO | 236.6 | J = 11− 10 | 1 (06) | 365 | 1.34 (–04) |
| CO | 216.9 | J = 12− 11 | 2 (06) | 431 | 1.74 (–04) |
| CO | 200.3 | J = 13− 12 | 2 (06) | 503 | 2.20 (–04) |
| CO | 137.3 | J = 19– 18 | 5 (06) | 1050 | 5.70 (–04) |
| 13CO | 546.2 | J = 5− 4 | 1 (05) | 79.3 | 1.07 (–05) |
| 13CO | 455.2 | J = 6− 5 | 2 (05) | 111 | 1.87 (–05) |
| 13CO | 390.2 | J = 7− 6 | 4 (05) | 148 | 2.99 (–05) |
| 13CO | 341.5 | J = 8− 7 | 5 (05) | 190 | 4.49 (–05) |
| 13CO | 303.6 | J = 9− 8 | 7 (05) | 238 | 6.41 (–05) |
| 13CO | 273.2 | J = 10− 9 | 1 (06) | 291 | 8.80 (–05) |
| 13CO | 248.4 | J = 11− 10 | 1 (06) | 349 | 1.17 (–04) |
| 13CO | 226.9 | J = 12− 11 | 2 (06) | 412 | 1.52 (–04) |
| 13CO | 209.5 | J = 13− 12 | 2 (06) | 481 | 1.92 (–04) |
Notes. The table lists: wavelength (λ), transition, critical density (ncrit), upper level energy (Eu∕k), and Einstein coefficient (Aij). Numbers in parentheses are power of 10. The critical densities have been calculated with ortho-H2 (Yang et al. 2010) and with a temperature of 100 K. The rest frequencies for CO were determined by Winnewisser et al. (1997) and for 13CO by Cazzoli et al. (2004).
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