Table 2
Column densities and isotope ratios derived for 12CO2 and 13CO2 ice.
| Source | L(L⊙) | Distance (pc) | N 12CO2 2.70 µm | N 12CO2 4.27 µm | N 13CO2 4.39 µm | N 12CO2 15.2 µm | 12C/13C 2.70 µm | 12C/13C 4.27 µm | 12C/13C 15.2 µm |
|---|---|---|---|---|---|---|---|---|---|
| B1-b | 0.2 | 293 | – | – | 2.6 × 1016 | 2.6 × 1018 | – | – | 100 ± 46 |
| TMC1-E | 0.7 | 142 | 1.0 × 1018 | 1.1 × 1018 | 1.6 × 1016 | 1.2 × 1018 | 62 ± 19 | 69 ± 18 | 75 ± 34 |
| TMC1-W | 0.7 | 142 | 1.3 × 1018 | 9.0 × 1017 | 1.2 × 1016 | 1.2 × 1018 | 81 ± 25 | 58 ± 15 | 76 ± 35 |
| B1-a-N | 1.5 | 293 | – | – | 2.2× 1016 | 2.1 × 1018 | – | – | 94 ± 43 |
| B1-a-S | 1.5 | 293 | – | – | 1.9 × 1016 | 2.1 × 1018 | – | – | 114 ± 52 |
| Per-emb55-a | 1.8 | 293 | 5.7 × 1017 | 5.7 1017 | 8.1 × 1015 | 6.0 × 1017 | 70 ± 21 | 70 ± 18 | 74 ± 34 |
| Per-emb55-b | 1.8 | 293 | 5.8 × 1017 | 6.2 1017 | 7.7 × 1015 | 5.5 × 1017 | 74 ± 23 | 80 ± 21 | 70 ± 32 |
| L1527 | 3.1 | 142 | – | – | 4.6 × 1016 | 4.8 × 1018 | – | – | 105 ± 48 |
| B1-c | 3.2 | 293 | – | – | 7.1 × 1016 | 7.9 × 1018 | – | – | 112 ± 52 |
| EDJ183-a | 3.2 | 293 | 5.7 × 1017 | 5.9 × 1017 | 7.0 × 1015 | 5.2 × 1017 | 81 ± 25 | 84 ± 22 | 74 ± 34 |
| EDJ183-b | 3.2 | 293 | 5.8 × 1017 | 5.5 × 1017 | 5.8 × 1015 | 5.1 × 1017 | 99 ± 31 | 94 ± 25 | 88 ± 40 |
| Per-emb22 | 3.6 | 293 | – | – | 4.4 × 1016 | 5.6 × 1018 | - | - | 125 ± 58 |
| Ser-S68N-N | 6 | 435 | 2.8 × 1018 | – | 2.6 × 1016 | 3.1 × 1018 | 108 ± 33 | - | 120 ± 55 |
| Per-emb33 | 8.3 | 293 | – | – | 6.1 × 1016 | 6.4 × 1018 | - | - | 105 ± 48 |
| Per-emb35 | 9.1 | 293 | 3.7 × 1018 | – | 2.8 × 1016 | 2.8 × 1018 | 132 ± 41 | - | 99 ± 48 |
| Ser-SMM3 | 28 | 435 | 1.1 × 1018 | – | 2.0 × 1016 | 2.2 × 1018 | 55 ± 17 | - | 108 ± 50 |
| Per-emb27 | 36 | 293 | – | – | 5.9 × 1016 | 6.5 × 1018 | − | − | 110 ± 51 |
Notes. The main source of uncertainty in the derived ratios stems from the error on the band strength, and the observational errors are negligible in contrast (~3%). The error on the band strength includes the change in the band strength due to temperature and due to a water-rich ice mixture. The error analysis is presented in detail in Appendix A.
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