Table 5
HN13C/H13CN and HN13C/H13CO+ abundance ratios.
| Source | [HN 13C ]∕[H 13CN ] | [HN13C]∕[H13CO+] |
|---|---|---|
| SMM 1 | 0.63 ± 0.21 | 0.03 ± 0.002 |
| SMM 2 | 0.21 ± 0.09 | 0.06 ± 0.01 |
| SMM 3 | 0.19 ± 0.16 | 0.04 ± 0.01 |
| BLOB 2 | 0.54 ± 0.12 | 0.04 ± 0.003 |
| BLOB 1 | 0.05 ± 0.02 | 0.06 ± 0.002 |
| SMM 4 | 0.61 ± 0.10 | 0.05 ± 0.02 |
| SMM 5 | 0.04 ± 0.02 | 0.03 ± 0.002 |
| IRAS 13037-6112 | 0.015 ± 0.004 | 0.02 ± 0.002 |
| SMM 6 | >0.15 | 0.09 ± 0.02 |
| SMM 7 | >0.09 | 0.05 ± 0.01 |
| IRAS 13039-6108 | 0.05 ± 0.03 | 0.03 ± 0.002 |
| SMM 8 | 0.03 ± 0.02 | 0.03 ± 0.002 |
| SMM 9 | 0.26 ± 0.06 | 0.03 ± 0.001 |
| IRAS 13042-6105 | >0.26 | 0.05 ± 0.01 |
| IR dark clumps | ||
| Mean | 0.38 ± 0.11 | 0.04 ± 0.004 |
| Median | 0.54 | 0.04 |
| IR bright clumps(a) | ||
| Mean | 0.27 ± 0.10 | 0.05 ± 0.008 |
| Median | 0.19 | 0.05 |
| Full sample | ||
| Mean | 0.30 ± 0.07 | 0.04 ± 0.005 |
| Median | 0.21 | 0.04 |
Notes. The abundance ratios were calculated from the molecular column densities. The quoted lower limits take the derived uncertainties into account. Survival analysis based on the K-M method was used to calculate the mean and median value of the [HN 13C ]∕[H13CN] ratio to take the right-censored values (i.e. lower limits) into account. (a)The source IRAS 13039-6108 was not included in the sub-sample of IR bright sources because it is associated with an H II region and represents a third type of clumps included in the present study.
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