Table 2
Molecules and their transitions.
| Molecule | Transition | Hyperfine | Frequency |  |
 |
Eup∕k | Instrument | Beff | HPBW | Reference |
|---|---|---|---|---|---|---|---|---|---|---|
| component | (GHz) | (km s−1) | (s−1) | (K) | (′′) | |||||
| OD | 2Π3∕2 J = 5∕2 ← 3∕2 | F = 3∕2−← 5∕2+ | 1391.4857 | + 1.9 | 2.3(−4) | 67 | SOFIA/GREAT | 0.67 | 20′′ | (1) |
| F = 5∕2−← 5∕2+ | 1391.4895 | + 1.1 | 3.7(−3) | |||||||
| F = 7∕2−← 5∕2+ | 1391.4947 | 0.0 | 2.3(−2) | |||||||
| F = 3∕2−← 3∕2+ | 1391.4980 | − 0.7 | 5.6(−3) | |||||||
| F = 5∕2−← 3∕2+ | 1391.5017 | − 1.5 | 2.0(−2) | |||||||
| F = 3∕2−← 1∕2+ | 1391.5051 | − 2.3 | 1.8(−2) | |||||||
| OH | 2Π1∕2 J = 3∕2 → 1∕2 | F = 1−→ 1+ | 1834.7350 | + 1.9 | 2.1(−2) | 270 | SOFIA/GREAT | 0.67(‡) | 16′′ | (1) |
| F = 2−→ 1+ | 1834.7469 | 0.0 | 6.4(−2) | |||||||
| F = 1−→ 0+ | 1834.7499 | − 0.5 | 4.2(−2) | |||||||
| 2Π1∕2 J = 3∕2 → 1∕2 | F = 1+ → 1− | 1837.7461 | + 11.5 | 2.1(−2) | 270 | SOFIA/GREAT | 0.67(‡) | 16′′ | ||
| F = 2+ → 1− | 1837.8163 | 0.0 | 6.4(−2) | |||||||
| F = 1+ → 0− | 1837.8365 | − 3.3 | 4.3(−2) | |||||||
| 18OH | 2Π3∕2 J = 5∕2 ← 3∕2 | F = 2−← 2+ | 2494.6809 | + 1.7 | 1.4(−2) | 120 | SOFIA/GREAT | 0.70 | 12′′ | (1) |
| F = 3−← 2+ | 2494.6950 | 0.0 | 1.4(−1) | |||||||
| F = 2−← 1+ | 2494.7342 | − 4.7 | 1.2(−1) | |||||||
| OH | 2Π3∕2 J = 5∕2 ← 3∕2 | F = 2−← 2+ | 2514.2987 | + 2.1 | 1.4(−2) | 121 | SOFIA/GREAT | 12′′ | (2) | |
| F = 3−← 2+ | 2514.3167 | 0.0 | 1.4(−1) | |||||||
| F = 2−← 1+ | 2514.3532 | − 4.4 | 1.2(−1) | |||||||
| HDO | 11,1−00,0 | 893.639 | 8.4(−3) | 43 | Herschel/HIFI | 24′′.1 | (3) | |||
| APEX/CHAMP | 7′′ | (4) | ||||||||
p-H O |
11,1−00,0 | 1101.698 | 1.8(−2) | 53 | Herschel/HIFI | 19′′.2 | (5) | |||
Notes. Frequencies, Einstein coefficients, and upper-level energies are from the JPL (Pickett et al. 1998) database. The 18OH line is only available for G34.26+0.15. HDO and the H
O line has only been used for G34.26+0.15. Molecules below the horizontal line are archival data.
(⋆)Velocity offset of the hfs components.
(†) The Einstein coefficients are listed in the form of A(B) = A × 10B.
(‡) This line has been observed in Cycle 4 towards the source G35.20−0.7 with a main beam efficiency of 0.70.
References. (1) This work, (2) Wiesemeyer et al. (2016), (3) Coutens et al. (2014), (4) Liu (2017), (5) Flagey et al. (2013).
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