Table 5
Derived physical parameters for PGIM isomers and proposed molecular precursors.
| Molecule | N | Tex | vLSR | FWHM | Abundance (a) | Reference |
|---|---|---|---|---|---|---|
| (1014 cm−2) | (K) | (km s−1) | (km s−1) | (×10−10) | ||
| Z-PGIM | 0.24 ± 0.02 | 8 | 69 | 20 | 1.8 | 1 |
| E-PGIM | <0.13 | 8 | 69 | 20 | <0.9 | 1 |
| CH3CCH (b) | 17.0 ± 2 | 19 ± 1 | 69 | 20 | 126 | 1 |
| HC3N (c) | 7.1 ± 1.3 | 12 ± 2 | 68 ± 1 | 22 ± 1 | 53 | 2 |
| CH2CHCN | 0.9 ± 0.1 | 10.8 ± 1.1 | 68 ± 1 | 22 ± 2 | 7 | 2 |
| CCH (c) | 53 ± 7 | – | – | – | 391 | 1 |
| Z-NCCHNH | 2.0 ± 0.6 | 8 ± 2 | 68.3 ± 0.8 | 20 | 15 | 3 |
| E-NCCHNH | 0.33 ± 0.03 | 8 | 68.0 ± 0.8 | 21± 2 | 2.4 | 3 |
| HCCCHO | 0.32 ± 0.02 | 18 ± 2 | 67.6 ± 0.4 | 20 | 2.4 | 4 |
Notes. (a) We adopted
cm−2
as inferred by Martín et al. (2008) from C18O observations. (b)Fit obtained from the J = 9 − 8, 8 − 7, 6 − 5 and 5 − 4 transitions with K = 0 and
K = 1.
(c) The column densities of HC3 N and CCH were derived from the optically thin transitions of the H13CCCN and C13CH isotopologues, respectively. The isotopic ratio of 12C∕13C ~ 21 measured by Armijos-Abendaño et al. (2015) in G+0.693 was used.
References. (1) This work; (2) Zeng et al. (2018); (3) Rivilla et al. (2019); (4) Rivilla (in prep.).
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