Table 3
Properties of the main lines in the two observed bands.
| Transition | HPBW | ηmb | ν0 | δv (1 MHz) | Eup | Aul | Cul | nc (20 K) |
| (arcsec) | (GHz) | (km s-1) | (K) | s-1 | (cm3 s-1) | (cm-3) | ||
|
|
||||||||
| SiO J = 2 → 1 | 28. | 81 | 86.847 | 3.5 | 6.25 | 2.93 × 10-5 | 1 × 1-10 | 2.93 × 105 |
| C2H N = 1 → 0 | 28. | 81 | 87.329 | 3.4 | 4.19 | 0.26 × 10-6 | 5.19 × 10-12 | 5.01 × 104 |
| (J = 3/2 → 1/2, F = 1−1) | ||||||||
| HNCO(404→ 303) | 28. | 81 | 87.925 | 3.4 | 10.55 | 9.02 × 10-6 | 9.2 × 10-12 | 9.80 × 105 |
| HCN J = 1 → 0 | 28. | 81 | 88.632 | 3.4 | 4.25 | 2.41 × 10-5 | 1.92 × 10-11 | 1.26 × 106 |
| HCO+ J = 1 → 0 | 28. | 81 | 89.189 | 3.4 | 4.28 | 4.25 × 10-5 | 2.3 × 10-10 | 1.85 × 105 |
| HNC J = 1 → 0 | 27. | 81 | 90.664 | 3.3 | 4.35 | 2.69 × 10-5 | 8.95 × 10-11 | 3.01 × 105 |
| HC3N J = 10 → 9 | 27. | 81 | 90.979 | 3.3 | 24.01 | 5.81 × 10-5 | 1.1 × 10-10 | 5.28 × 105 |
|
|
||||||||
| SiO J = 5 → 4 | 11. | 60 | 217.105 | 1.4 | 31.26 | 5.20 × 10-4 | 1.1 × 10-10 | 4.73 × 106 |
| H2CO(303→ 202) | 11. | 60 | 218.222 | 1.4 | 21.0 | 2.82 × 10-4 | 1.1 × 10-10 | 2.56 × 106 |
| H2CO(322→ 221) | 11. | 60 | 218.476 | 1.4 | 68.1 | 1.57 × 10-4 | 5.3 × 10-11 | 2.96 × 106 |
| H2CO(321→ 220) | 11. | 60 | 218.760 | 1.4 | 68.1 | 1.58 × 10-4 | 4.3 × 10-11 | 3.67 × 106 |
| C18O J = 2 → 1 | 11. | 60 | 219.560 | 1.4 | 15.81 | 6.01 × 10-7 | 6.44 × 10-11 | 9.33 × 103 |
| 13CO J = 2 → 1 | 11. | 60 | 220.399 | 1.4 | 15.87 | 6.04 × 10-7 | 6.44 × 10-11 | 9.38 × 103 |
| 12CO J = 2 → 1 | 11. | 60 | 230.538 | 1.3 | 16.60 | 6.91 × 10-7 | 6.44 × 10-11 | 1.07 × 104 |
| 12CO J = 1 → 0 | 21. | 71 | 115.271 | 2.6 | 5.53 | 7.20 × 10-8 | 3.25 × 10-11 | 2.22 × 103 |
Notes. The beam sizes (HPBW) and the main beam efficiencies (ηmb) are presented with the rest frequencies ν0 of the brightest lines in each band and the velocity bin corresponding to 1 MHz. The energy levels Eup and Einstein coefficients Aul are based on the Leiden Atomic and Molecular Database (Schöier et al. 2005); the collisional de-excitation rate coefficients Cul are computed at a kinetic temperature of 20 K. The critical density is computed as nc = Aul/Cul.
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