Table 1.
Column densities (a) and abundance ratios for the isomers of HC3N and HC5N towards TMC-1 and IRC+10216.
| Molecule | TMC-1 | IRC+10216 |
|---|---|---|
| N(HC3N) | (2.3 ± 0.2) × 1014 | (4.5 ± 0.2) × 1014 |
| N(HCCNC) | (3.0 ± 0.3) × 1012 | (1.1 ± 0.1) × 1012 |
| N(HNCCC) | (5.2 ± 0.3) × 1011 | (3.4 ± 0.2) × 1011 |
| N(HC5N) | (1.8 ± 0.2) × 1014 | (4.2 ± 0.4) × 1014(b) |
| N(HC4NC) | (3.0 ± 0.7) × 1011 | ≤2.1 × 1011 |
| N(HNC5) | ≤1.5 × 1011 | ≤1.1 × 1011 |
| N(HC7N) | (6.4 ± 0.2) × 1013 | (1.9 ± 0.2) × 1014(c) |
| N(HC6NC) | ≤9.0 × 1010 | ≤2.0 × 1011 |
| N(HC3N)/N(HCCNC) | 77.0 ± 8.0 | 392 ± 22 |
| N(HC3N)/N(HNCCC) | 442.0 ± 70.0 | 1305 ± 45 |
| N(HCCNC)/N(HNCCC) | 5.8 ± 1.0 | 4.0 ± 0.9 |
| N(HC5N)/N(HC4NC) | 600 ± 70.0 | ≥2000 |
| N(HC5N)/N(HNC5) | ≥1200 | ≥3800 |
| N(HC4NC)/N(HNC5) | ≥2 | ≥1.9 |
| N(HC7N)/N(HC6NC) | ≥710.0 | ≥950 |
| N(HC3N)/N(HC5N) | 1.3 ± 0.2 | 1.1 ± 0.2 |
| N(HC5N)/N(HC7N) | 2.8 ± 0.3 | 2.2 ± 0.5 |
Notes.
For IRC+10216, we adopted the value derived by Pardo et al. (2020), which corresponds to the gas component with Trot = 10.1 K. A second component, with similar column density, was found for high-J levels with a Trot = 24.5 K.
For IRC+10216, we adopted the value derived by Pardo et al. (2020), which corresponds to the gas component with Trot = 16.8 K. A second component, with a column density 2.5 lower, was found for high-J levels with a Trot = 31.6 K.
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