Table A.1.
Column density of CnHm, CnH+, and CnH− species in TMC-1
| Molecule | N | Abundancea | Ref. |
|---|---|---|---|
| (cm−2) | |||
| CH | (6-16) × 1013 | (6-16) × 10−09 | 1 |
| CCH | (6.5±2.7) × 1014 | (6.5±2.7) × 10−08 | 2 |
| C2H4 | (3-7) × 1013 | (3-7) × 10−09 | 3a |
| CH3CH3 | (3-6) × 1012 | (3-6) × 10−10 | 3b |
| C3H | (6.0±0.6) × 1012 | (6.0±0.6) × 10−10 | 4 |
| c-C3H | (1.2±0.3) × 1012 | (1.2±0.3) × 10−10 | 4 |
| C3H+ | (2.4±0.2) × 1010 | (2.4±0.2) × 10−12 | 5 |
| c−C3H2 | (1.2±0.1) × 1014 | (1.2±0.1) × 10−08 | 6 |
| H2C3 | (1.9±0.5) × 1012 | (1.9±0.5) × 10−10 | 7 |
| CH2CCH | (8.7±0.7) × 1013 | (8.7±0.7) × 10−09 | 8 |
| CH3CCH | (1.3±0.1) × 1014 | (1.3±0.1) × 10−08 | 6 |
| CH2CHCH3 | (4.0±0.4) × 1013 | (4.0±0.4) × 10−09 | 9 |
| C4H | (9.0±1.0) × 1013 | (9.9±1.0) × 10−09 | 10 |
| C4H− | (2.1±0.2) × 1010 | (2.1±0.2) × 10−12 | 10 |
| H2C4 | (3.3±0.9) × 1012 | (1.3±0.1) × 10−10 | 7 |
| CH2CHCCH | (1.2±0.2) × 1013 | (1.2±0.2) × 10−09 | 11 |
| C5H | (1.3±0.3) × 1012 | (1.3±0.3) × 10−10 | 12 |
| c-C5H | (9.0±0.9) × 1010 | (9.0±0.9) × 10−12 | 12 |
| C5H+ | (8.8±0.5) × 1010 | (8.8±0.5) × 10−12 | 5 |
| c-C3HCCH | (3.1±0.8) × 1011 | (3.1±0.8) × 10−11 | 13 |
| H2C5 | (1.8±0.5) × 1010 | (1.8±0.5) × 10−12 | 7 |
| CH2CCHCCH | (1.2±0.2) × 1013 | (1.2±0.2) × 10−09 | 14 |
| CH3C4H | (6.5±0.3) × 1012 | (6.5±0.3) × 10−10 | 14 |
| c-C5H6 | (1.2±0.3) × 1013 | (1.2±0.3) × 10−09 | 13 |
| C6H | (6.0±1.0) × 1012 | (6.0±1.0) × 10−10 | 10 |
| C6H− | (1.6±0.3) × 1011 | (1.6±0.3) × 10−11 | 10 |
| H2C6 | (8.0±2.4) × 1010 | (8.0±2.4) × 10−12 | 7 |
| o-C6H4 | (5.0±1.0) × 1011 | (5.0±1.0) × 10−11 | 15 |
| c-C6H6 | (0.6-1.2) × 1013 | (0.6-1.2) × 10−09 | 16 |
| c-C5H4CH2 | ≤3.5×1012 | ≤3.5×10−10 | 17 |
| C7H | (6.5±0.6) × 1010 | (6.5±0.6) × 10−12 | 4 |
| CH2CCHC4H | (1.2±0.2) × 1011 | (1.2±0.2) × 10−11 | 18 |
| CH3C6H | (7.0±0.7) × 1011 | (7.0±0.7) × 10−11 | 18 |
| 1-c-C5H5CCH | (1.4±0.2) × 1012 | (1.4±0.2) × 10−10 | 19 |
| 2-c-C5H5CCH | (2.0±0.4) × 1012 | (2.0±0.2) × 10−10 | 19 |
| c-C5H4CCH2 | (2.7±0.3) × 1012 | (2.7±0.3) × 10−10 | 17 |
| c-C6H5CH3 | ≤6.0×1012 | ≤6.0×10−10 | 17 |
| C8H | (5.0±2.1) × 1011 | (5.0±2.1) × 10−11 | 10 |
| C8H− | (2.6±0.4) × 1010 | (2.6±0.4) × 10−12 | 10 |
| c-C6H5CHCH2 | ≤1.0×1014 | ≤1.0×10−08 | 17 |
| C9H | ≤3.5×1010 | ≤3.5×10−12 | 4 |
| c-C9H8 | (1.6±0.3) × 1013 | (1.6±0.3) × 10−09 | 13 |
| 1-c-C10H8 | (3.5-7) × 1012 | (3.5-7) × 10−10 | 20 |
| 2-c-C10H8 | (3.5-7) × 1012 | (3.5-7) × 10−10 | 20 |
Notes.
Assuming a H2 column density of 1022 cm−2 (Cernicharo & Guélin 1987).
Range of column densities derived by Hjalmarson et al. (1977) towards several positions in Taurus, some of them around TMC-1. The quoted column densities of CH are representative of the Taurus complex.
Estimated from the column density of CH2CHCCH obtained by Cernicharo et al. (2021d) and assuming an abundance ratio between C2H4 and CH2CHCCH ∼3–6.
Estimated from the column density of CH3CH2CCH obtained by Cernicharo et al. (2021d) and assuming an abundance ratio between C2H6 and CH3CH2CCH ∼3–6.
See Appendix A
Estimated from the column density of C6H5CN obtained by Cernicharo et al. (2021f) and assuming an abundance ratio between benzene and benzonitrile ∼5–10.
From the column density of the isomers of cyanonaphthalene derived by McGuire et al. (2021) assuming an abundance ratio of 5–10 between naphthalene and its cyano derivatives.
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