Table 3
Excitation temperatures derived with MADCUBA.
| Tex (K) | Tk (K) | |||||||
|---|---|---|---|---|---|---|---|---|
| Hydrocarbons | Cyanides | |||||||
| Source | C2H | c-C3H | c-C3H2 | CH3CCH | HC3N | CH3CN | HC5N | NH3 |
| G034-1 a | 4b | − | 4.5(0.4) | 14.2(1.2) | 6.8(0.2) | − | − | 15.2(0.4) |
| G034-2 | 4b | − | 5.7(0.6) | − | 6.3(0.5) | − | − | |
| AFGL-1 c | 18.0(0.2) | 14(3) | 17.5(0.4) | 53.9(0.3) | 37(0.7) | − | 48(2) | 21.5(0.5) |
| AFGL-2 | − | − | − | − | 125(8) | 117.1(1.4) | − | |
| G589-1 d | 18.6(1.1) | − | 14.4(1.3) | 67.2(0.8) | 58.3(0.3) | 76.8(0.7) | 120(14) | 29.0(0.3) |
| G589-2 | − | − | − | − | 95.6(1.6) | − | 154(26) | |
Notes. The errors are listed in brackets. As a reference, the last column gives Tk derived from the NH3 (1,1) and (2,2) inversion transitions analysed by Fontani et al. (2015a). Note that this value refers to a specific layer of the sources. (a) Two velocity features centred at ~41.6 km s−1 (G034-1) and ~43.3 km s−1 (G034-2), respectively. (b) Tex value fixed in MADCUBA for both velocity features, for which the residuals between synthetic and observed spectra are minimum. (c) Two components with the same peak velocity but FWHM of ~2.6 km s−1 (AFGL-1) and ~6.6 km s−1 (AFGL-2), respectively. (d) Two components with the same peak velocity but FWHM of ~4 km s−1 (G589-1) and ~11 km s−1 (G589-2), respectively.
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