Table 2
NH3 maser families in W51-IRS2.
| Velocity | Transitions | Notes |
|---|---|---|
| (km s–1) | (J, K) | |
| 45 | (6,6),(7,6),(7,7),(8,6),(10,9),(11,9) | 1 |
| 54 | (6,2),(7,3),(7,4),(7,5),(8,5),(9,7),(9,8),(10,7) | 2 |
| 57 | (5,2),(5,3),(5,4),(6,3),(6,4) | |
| Other | (9,6) | 3 |
Notes. 1 – due to a secular drift toward higher velocities, now the formerly termed 45 km s–1 component is seen at slightly higher velocities. 2 – the (5,4) line also contains a weak feature near 54 km s–1, but maser emission at 57 km s–1 dominates. Some other transitions also show occasionally double maser features. These are addressed in Sect. 3.4.4. 3. – the (9,6) line covers a wide velocity range from <50 to >60 km s–1, see Figs. A.29 to A.32.
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