Table 3
Parameters of the hyperfine components of NH3 inversion lines observed toward NGC 7538 IRS1.
| Line | ΔνHF | ΔVHF | ams | Fpeak | ΔV1/2 | Fint | Opacity | ||
| (J, K) | (MHz) | (km s-1) | (Jy) | (km s-1) | (Jy km s-1) | (τ) | |||
| Inner | Outer | Inner | Outer | ||||||
|
|
|||||||||
| Core component | |||||||||
| (6, 6) | ±2.24 | ±2.62 | ±26.9 | ±31.4 | 0.0081 | –0.060 | 7.6 | –0.4 | 26 |
| (7, 7) | ±2.34 | ±2.68 | ±27.3 | ±31.2 | 0.0060 | –0.022 | 6.6 | –0.2 | 22 |
| (9, 9) | ±2.48 | ±2.75 | ±27.0 | ±30.1 | 0.0037 | –0.010 | 6.9 | –0.06 | 10 |
| Southern component | |||||||||
| (6, 6) | ±2.24 | ±2.62 | ±26.9 | ±31.4 | 0.0081 | –0.007 | 4.5 | –0.034 | 12 |
| (7, 7) | ±2.34 | ±2.68 | ±27.3 | ±31.2 | 0.0060 | –0.002 | 5.2 | –0.012 | 10 |
Notes. The frequency separations (ΔνHF, Cols. 2 and 3) of the four satellite components can be calculated using quantum mechanics formalism for a symmetric molecular rotor. The corresponding velocity separations (ΔVHF) are also reported in Cols. 4 and 5. ams (Col. 6) is the theoretical ratio of the satellite line to the main line strengths. Fpeak, Fint, and ΔV1/2 were fitted simultaneously for all the hyperfine quadrupole satellite components assuming a Gaussian shape for each of the hyperfine lines. The values reported in the table are average values of the four Gaussians fitted to the HFS satellites. τ (Col. 10) is the line opacity estimated numerically with Eq. (A.1).
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