Table 2
Parameters of the NH3 inversion lines observed toward NGC 7538 IRS1.
| Line | Fpeak | Vc | ΔV1/2 | Fint | Fcont | ||||||||
| (J, K) | (Jy) | (km s-1) | (km s-1) | (Jy km s-1) | (Jy) | ||||||||
|
|
|||||||||||||
| Core component | |||||||||||||
| (6, 6) | −0.236 | −59.3 | 8.3 | −2.1 | 0.34 | ||||||||
| (7, 7) | –0.208 | –59.4 | 7.4 | –1.6 | 0.34 | ||||||||
| (9, 9) | –0.194 | –59.1 | 7.8 | –1.6 | 0.34 | ||||||||
| (10, 10) | –0.135 | –59.2 | 7.1 | –1.0 | 0.37 | ||||||||
| (12, 12) | –0.113 | –59.3 | 7.9 | –0.95 | 0.34 | ||||||||
| (13, 13) | –0.048 | –58.2 | 10 | –0.52 | 0.46 | ||||||||
| (14, 14) | –0.032 | –58.8 | 13 | –0.45 | 0.42 | ||||||||
| CH3OH | –0.155 | –58.9 | 5.9 | –0.98 | 0.34 | ||||||||
| Southern component | |||||||||||||
| (6, 6) | –0.060 | –59.7 | 5.6 | –0.36 | 0.07 | ||||||||
| (7, 7) | –0.046 | –59.8 | 4.4 | –0.21 | 0.07 | ||||||||
| (9, 9) | –0.029 | –59.5 | 4.4 | –0.14 | 0.07 | ||||||||
| (10, 10) | –0.013 | –59.4 | 4.3 | –0.06 | 0.07 | ||||||||
| CH3OH | –0.044 | –59.6 | 4.6 | –0.22 | 0.07 | ||||||||
Notes. The peak fluxes (Fpeak, Col. 2), the central velocities (Vc; Col. 3), the FWHM line-width (ΔV1/2; Col. 4), and the velocity-integrated flux (Fint; Col. 5) are estimated from single-Gaussian fits to the spectral profiles shown in Figs. 1 and 2. The core shows actually a stronger component around −59 km s-1 and a weaker component around −56 km s-1, the latter becomes more comparable with the stronger component at higher excitation energies. This partly explains the different velocity-centroids and line-widths at different excitations. The table reports also the continuum emission flux density at the corresponding frequency of the inversion line (Fcont; Col. 6).
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