Table 3
Critical densities and the transition (excitation) energies for the atomic FS lines and the molecular lines.
| Line | ν (GHz) | λ (μm) | ncr (cm-3) | E/kb (K) |
|
|
||||
| Atomic | ||||
|
|
||||
| [ OI ] | 4759 | 63 | 5.0 × 105 (H) | 228 |
| [ CI ] | 809 | 369 | 3.0 × 102 (L) | 63 |
| [ CI ] | 492 | 609 | 2.0 × 103 (M) | 24 |
| [ CII ] | 1897 | 158 | 2.8 × 103 (M) | 92 |
|
|
||||
| Molecular | ||||
|
|
||||
| CO(1–0) | 115 | 2602 | 2.2 × 103 (M) | 5.53a |
| CO(2–1) | 230 | 1301 | 1.2 × 104 (M) | 16.6 |
| CO(3–2) | 346 | 867.6 | 3.8 × 104 (M) | 33.2 |
| CO(4–3) | 461 | 650.7 | 9.1 × 104 (M) | 55.3 |
| CO(6–5) | 691 | 433.9 | 3.0 × 105 (H) | 116 |
| CO(7–6) | 806 | 371.9 | 4.6 × 105 (H) | 155 |
| CO(10–9) | 1151 | 260.4 | 1.1 × 106 (H) | 304 |
| CO(16–15) | 1841 | 162.9 | 3.5 × 106 (H) | 751 |
|
|
||||
| 13CO(1–0) | 110 | 2722 | 1.9 × 103 (M) | 5.29a |
| 13CO(2–1) | 220 | 1361 | 1.0 × 104 (M) | 15.9 |
| 13CO(3–2) | 330 | 907.5 | 3.3 × 104 (M) | 31.7 |
| 13CO(6–5) | 661 | 453.8 | 2.6 × 105 (H) | 111 |
|
|
||||
| HCN(1–0) | 88.6 | 3384 | 2.0 × 106 (H) | 4.25b |
| HCN(4–3) | 354 | 846.3 | 2.1 × 108 (H) | 42.5 |
|
|
||||
| HNC(1–0) | 90.7 | 3309 | 3.6 × 105 (H) | 4.35b |
| HNC(4–3) | 362 | 827.6 | 2.1 × 107 (H) | 43.5 |
|
|
||||
| HCO+(1–0) | 89.2 | 3363 | 2.1 × 105 (H) | 4.28c |
| HCO+(4–3) | 356 | 841.0 | 9.3 × 106 (H) | 42.8 |
|
|
||||
| CS(1–0) | 45.0 | 6123 | 5.4 × 104 (M) | 2.35d |
| CS(4–3) | 196 | 1531 | 3.0 × 106 (H) | 23.5 |
|
|
||||
| CN(11/2–01/2) | 113 | 2651 | 1.8 × 106 (H) | 5.43e |
| CN(23/2–13/2) | 226 | 1325 | 4.7 × 106 (H) | 16.3 |
Notes. The critical densities for the molecular lines displayed were computed for a kinetic temperature of 50 K; whereas the one for the FS lines were computed at 500 K. The values of ncr are shown to give the reader an idea of the regime for the densities where the species would be at LTE or not. The symbols “L” (low), “M” (medium), “H” (high) indicate the range in density where the ncr of the corresponding transition lies.
Reference.
From Yang et al. (2010).
From Botschwina et al. (1993).
From Lique et al. (2006).
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