Table 1
Parameters of the samples.
| Object | nH (cm−3) ×104 | M (M⊙) | Nsp | tchem (yr)* ×105 | Des.† | Ref. |
|---|---|---|---|---|---|---|
| TMC1-CP | 1 ~ 2 | 1.0 | 31 | <10, 0.x | A.1 | a,g,i |
| L134N | 1 ~ 30 | ~1.1 | 28 | 8.5 ~ 20 | A.2 | a,h |
| L1521E | 27 | 1.0 ± 0.1 | 16 | 1.7 | A.3 | b,g |
| L1517B | 22 | 10 | 3 ~ 5 | A.4 | c | |
| L1498 | 9.4 | 1–3 | 11 | 3 ~ 5, 0.x | A.4 | c,i |
| B68 | 56 | 1.6 ± 0.07 | 6 | ~1 | A.5 | d |
| L1544 | 100 ~ 1000 | 2–3 | 26 | 1 ~ 10, 0.x | A.6 | b,e,i |
| 32 PGCCs | 7 ~ 200 | ~1.0 | 5 | ? | A.7 | f |
Notes. Nsp is the number of used observed species; “0.x” means a few 104 yr as proposed by reference i; “?” means not determined yet. * The chemical ages are consistent with the ones derived for dense cores by Kirk et al. (2005). † Descriptions of the samples. References. (a) Agúndez & Wakelam (2013), (b) Nagy et al. (2019); (c) Tafalla et al. (2004, 2006), (d) Amin & El-Nawawy (2005), Vastel et al. (2018), (f) Yi et al. (2018); Yi et al. (2021), (g) Fuente et al. (2019), (h) Lattanzi et al. (2020), (i) Chen et al. (2022).
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