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Table 2
Parameters used in the derivation of the column densities.
| Molecule | Frequency | Tex (K) | Q(Tex) | Eu(a)(K) | A(a) (s−1) | ncrit (cm−3) | ɡu (a) | τ |
|---|---|---|---|---|---|---|---|---|
| L1544 | ||||||||
| CCH | 87446.47(1) | 6 | 12.88 | 4.2 | 2.61e–7 | 9e+4 | 3 | 0.348(8) |
| 13CCH | 84119.33(2) | 6 | 26.40 | 4.08 | 1.37e–6 | 5e+5 | 6 | 0.012(1) |
| C13CH | 85229.335(4) | 6 | 26.30 | 4.1 | 1.42e–6 | 5e+5 | 6 | 0.028(2) |
| CCD | 72101.811(5) | 6 | 22.92 | 3.5 | 3.28e–7 | 1e+5 | 4 | 0.058(9) |
| H13CN | 86342.2543(3) | 3.3 | 5.92 | 4.1 | 2.22e–5 | 7e+5 | 1 | 0.48(9) |
| DCN | 72417.03(1) | 3.7 | 7.49 | 3.5 | 1.32e–5 | 4e+5 | 1 | 0.9(2) |
| H13CO+ | 86754.288(5) | 6 | 3.24 | 4.2 | 3.85e–5 | 2e+5 | 3 | 0.55(1) |
| HC18O+ | 85162.223(5) | 5.5 | 3.05 | 4.1 | 3.65e–5 | 1e+5 | 3 | 0.086(2) |
| DCO+ | 72039.3124(8) | 7.8 | 4.86 | 3.5 | 2.21e–5 | 1e+5 | 3 | 0.657(7) |
| HN13C | 87090.675(3) | 4 | 27.49 | 4.2 | 1.58e–5 | 1e+5 | 7 | 0.24(3) |
| DNC | 76305.513(1) | 5 | 27.81 | 3.7 | 1.60e–5 | 2e+5 | 6 | 0.57(2) |
| HH211 | ||||||||
| CCH | 87284.11(1) | 6 | 12.88 | 4.2 | 2.60e–7 | 9e+4 | 3 | 0.165(5) |
| 13CCH | 84153.31(2) | 6 | 26.40 | 4.08 | 1.37e–6 | 5e+5 | 4 | 0.005(1) |
| C13CH | 85229.335(4) | 6 | 26.30 | 4.1 | 1.42e–6 | 5e+5 | 6 | 0.010(1) |
| CCD | 72107.721(3) | 6 | 22.92 | 3.5 | 8.60e–7 | 3e+5 | 6 | 0.12(2) |
| H13CN | 86340.1666(1) | 4.1 | 7.05 | 4.1 | 2.22e–5 | 7e+5 | 5 | 0.39(2) |
| DCN | 72417.03(1) | 3.7 | 7.49 | 3.5 | 1.32e–5 | 4e+5 | 1 | 0.44(7) |
| H13CO+ | 86754.288(5) | 6 | 3.24 | 4.2 | 3.85e–5 | 2e+5 | 3 | 0.91(1) |
| HC18O+ | 85162.223(5) | 5.5 | 3.05 | 4.1 | 3.65e–5 | 1e+5 | 3 | 0.057(2) |
| DCO+ | 72039.3124(8) | 7.8 | 4.86 | 3.5 | 2.21e–5 | 1e+5 | 3 | 0.899(7) |
| HN13C | 87090.675(3) | 4 | 27.49 | 4.2 | 1.58e–5 | 1e+5 | 7 | 0.073(4) |
| DNC | 76305.513(1) | 5 | 27.81 | 3.7 | 1.60e–5 | 2e+5 | 6 | 0.28(2) |
Notes. (a)Extracted from the Cologne Database for Molecular Spectroscopy (Müller et al. 2001).
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