Table 1.
Abundances of ethynyl and cyano species in TMC-1.
| Molecule | N (cm−2) | Abundance (a) | Comments |
|---|---|---|---|
| c-C5H6 | 1.3 × 1013 | 1.3 × 10−09 | (1) |
| 1-c-C5H5CCH | 1.4 × 1012 | 1.4 × 10−10 | (2) |
| 2-c-C5H5CCH | 2.0 × 1012 | 2.0 × 10−10 | (2) |
| 1-c-C5H5CN | 3.1 × 1011 | 3.1 × 10−11 | (2,A) |
| 2-c-C5H5CN | 1.3 × 1011 | 1.3 × 10−11 | (2,B) |
| C6H5CCH | ∼2.5 × 1012 | 2.5 × 10−10 | (2,C) |
| C6H5CN | 1.2 × 1012 | 1.2 × 10−10 | (2,D) |
| c-C9H8 | 1.6 × 1013 | 1.6 × 10−09 | (1,E) |
Notes.
Assuming a column density of molecular hydrogen of 1022 cm−2 (Cernicharo & Guélin 1987). We note that there is a significant difference in the beam size for the QUIJOTE and GOTHAM line surveys. This could explain, at least partially, the differences in the derived parameters.
References.
A value of 1.44 × 1012 cm−2 was reported by McCarthy et al. (2021) and of 8.3 × 1011 cm−2 by Lee et al. (2021).
A value of 1.9 × 1011 cm−2 was derived by Lee et al. (2021).
A value of 4.0 × 1011 cm−2 was derived by McGuire et al. (2018). This value was revised to 1.6 × 1011 cm−2 by Burkhardt et al. (2021).
A value of 9.6 × 1012 cm−2 was reported by Burkhardt et al. (2021).
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