Table 2
Column densities and rotational temperatures of the molecules in IRC +10216.
| Species | Trot(K) | N(cm-2) | X(N/NH2) | Ref. |
|
|
||||
| HC3N | 27.2 ± 19.4 | (1.94 ± 0.21) × 1015 | 9.24 × 10-7 | 0 |
| 24.7 ± 18.5 | (1.4 ± 0.2) × 1015 | 6.7 × 10-7 | 1 | |
| 26 | 1.7 × 1015 | 2 | ||
|
|
||||
| H13CCCN | 18.7 ± 3.3 | (3.25 ± 1.46) × 1013 | 1.55 × 10-8 | 0 |
|
|
||||
| HC5N | 13.6 ± 2.1 | (5.47 ± 0.77) × 1014 | 2.61 × 10-7 | 0 |
| 18.8 ± 1.3 | (4.6 ± 0.2) × 1014 | 2.2 × 10-7 | 1 | |
| 27 ± 5 | (2.7 ± 0.2) × 1014 | 2 | ||
|
|
||||
| HC7N | 21.5 ± 1.7 | (6.21 ± 0.67) × 1014 | 2.96 × 10-7 | 0 |
| 12.1 ± 1.3 | (3.7 ± 0.4) × 1014 | 1.8 × 10-7 | 1 | |
| 26 ± 2 | (1.52 ± 0.07) × 1014 | 2 | ||
|
|
||||
| HC9N | 19.8 ± 2.4 | (5.88 ± 1.28) × 1013 | 2.80 × 10-8 | 0 |
| 20.9 ± 10.7 | (2.5 ± 1.4) × 1013 | 1.2 × 10-8 | 1 | |
| 23 ± 8 | (2.7 ± 0.9) × 1013 | 2 | ||
|
|
||||
| c-C3H2 | 6.1 ± 2.8 | (1.39 ± 1.07) × 1014 | 6.60 × 10-8 | 0 |
| 5.5 ± 0.6 | (2.1 ± 0.4) × 1014 | 9.9 × 10-8 | 1 | |
|
|
||||
l-C5H  |
4.7 ± 2.0 | (2.96 ± 1.21) × 1014 | 1.41 × 10-7 | 0 |
| 8.3 ± 2.0 | (2.9 ± 0.6) × 1013 | 1.4 × 10-8 | 1 | |
| 27 ± 5 | (2.9 ± 0.3) × 1014 | 2 | ||
|
|
||||
| C6H− | 8.9 ± 3.4 | (6.11 ± 2.99) × 1012 | 2.91 × 10-9 | 0 |
| 26.9 ± 4.0 | (5.8 ± 0.5) × 1012 | 2.8 × 10-9 | 1 | |
|
|
||||
| C6H |
13.7 ± 2.7 | (1.85 ± 0.90) × 1014 | 8.82 × 10-8 | 0 |
| 20.7 ± 2.4 | (1.0 ± 0.2) × 1014 | 4.8 × 10-8 | 1 | |
| 46 ± 4 | (1.13 ± 0.6) × 1014 | 2 | ||
|
|
||||
C6H  |
18.1 ± 5.8 | (5.38 ± 1.18) × 1013 | 2.56 × 10-8 | 0 |
| 47.2 ± 10.3 | (1.0 ± 0.1) × 1014 | 4.8 × 10-8 | 1 | |
| 35 ± 2 | (1.65 ± 0.07) × 1014 | 2 | ||
|
|
||||
| C8H |
12.3 ± 1.6 | (5.00 ± 1.08) × 1013 | 2.38 × 10-8 | 0 |
| 13.9 ± 1.3 | (8.4 ± 1.4) × 1012 | 4.0 × 10-9 | 1 | |
|
|
||||
| SiC2 | 40.1 ± 36.2 | (1.87 ± 1.34) × 1015 | 8.90 × 10-7 | 0 |
| 31.8 ± 0.9 | (1.2 ± 0.0) × 1015 | 5.7 × 10-7 | 1 | |
| 16 | 2.2 × 1014 | 2 | ||
|
|
||||
| SiC4 | 7.6 ± 3.0 | (1.46 ± 0.92) × 1013 | 6.98 × 10-9 | 0 |
| 22.3 ± 17.5 | (1.1 ± 0.4) × 1013 | 5.2 × 10-9 | 1 | |
Notes. References for rotational temperatures and column densities from: (0) this work; (1) Gong et al. (2015); (2) Kawaguchi et al. (1995). The results of Gong et al. (2015) and Kawaguchi et al. (1995) are also used the method of rotational diagrams.
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