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Table 1.
Best-fit solutions obtained for NH3 and 15NH3 lines towards L1544 and IRAS4A.
| Species | Trot | Tex | log10[Ncol] | σV | Vlsr |
|---|---|---|---|---|---|
| (K) | (K) | (log10[cm−2]) | (km s−1) | (km s−1) | |
| L1544 | |||||
| NH3 | 8.74 ± 0.06 | 6.322 ± 0.016 | 14.970 ± 0.003 | 0.1464 ± 0.0006 | 7.1603 ± 0.0007 |
| 15NH3 | 8.74 | 6.322 | 12.38 ± 0.05 | 0.20 ± 0.04 | 7.20 ± 0.04 |
| IRAS4A – 1 component | |||||
| NH3 | 12.55 ± 0.16 | 6.07 ± 0.11 | 14.715 ± 0.012 | 0.528 ± 0.006 | 7.585 ± 0.005 |
| 15NH3 | 12.55 | 6.07 | 12.31 ± 0.08 | 0.9 ± 0.2 | 7.2 ± 0.2 |
| IRAS4A – 2 components | |||||
| NH3 warmer component | 13.22 ± 0.11 | 5.08 ± 0.07 | 14.474 ± 0.012 | 0.423 ± 0.008 | 7.107 ± 0.013 |
| NH3 colder component | 11.97 ± 0.09 | 5.06 ± 0.07 | 14.522 ± 0.006 | 0.245 ± 0.003 | 7.915 ± 0.004 |
| 15NH3 | 13.22 | 5.08 | 12.39 ± 0.08 | 0.9 ± 0.2 | 7.2 ± 0.2 |
Notes. For the latter, two sets of values are reported, corresponding to the one-component and two-component approaches (see main text for more details).
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