Table 2
Characteristics and observational parameters of the OH transitions between the 
J = 3/2 and J = 1/2 states, and of the [OI]63μm and CO (16–15) lines.
| Triplet | Transition | Frequency | A ul | g u | g l | E u | Shift | Beam size | Spectral resolution | Beam | Forward | T sys |
| properties |
|
(GHz) | (s-1) | (K) | (km s-1) | (′′) | (km s-1) | efficiency | efficiency | (K) | ||
|
|
||||||||||||
| OH | 1 + → 1 − | 1837.7466 | 2.1(−2) | 3 | 3 | 270.1 | 11.5 | |||||
| 1838 GHz | 2 + → 1 − | 1837.8168 | 6.4(−2) | 5 | 3 | 270.1 | 0.0 | 15.3 | 1.00 | 0.67 | 0.97 | 4930–5324 |
| 163.1 μm | 1 + → 0 − | 1837.8370 | 4.3(−2) | 3 | 1 | 270.1 | −3.3 | |||||
|
|
||||||||||||
| CO | (16–15) | 1841.3455 | 4.05(−4) | 33 | 31 | 751.7 | 15.3 | 0.99 | 0.65 | 0.97 | 4930–5324 | |
|
|
||||||||||||
| O i | 3P1 → 3P2 | 4744.7775 | 8.91(−5) | 3 | 5 | 227.7 | 6.1 | 0.99 | 0.67 | 0.97 | 2997–4232 | |
Notes. A(B) ≡ A × 10B. The “shift” column contains the velocity shift relative to the component with the largest Einstein A coefficient for the OH transition. Source: JPL (Pickett et al. 1998).
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