Table 4
Abundances relative to H2.
| Molecule | Abundance | Uncertainty | Comment | N(H2)∕∫ τdv |
|---|---|---|---|---|
| dex | cm−2/km s−1 | |||
| HCO+ | 3.1 × 10−9 | 0.21 | Using [CH] = 3.6 × 10−8 and E(B-V)e | 4.0 × 1020 |
| HOC+ | 4.6 × 10−11 | 0.21 | From [HOC+]/[HCO+] | 5.2 × 1022 |
| CF+ | 1.7 × 10−10 | 0.30 | From [CF+]/[HCO+] | 9.0 × 1022 |
| C3H+ | 7.5 × 10−11 | 0.30 | From [C3H+]/[HCO+] | 2.0 × 1023 |
| HF | 1.2 × 10−8 | 0.14 | Using [CH] = 3.6 × 10−8e | 2.0 × 1020 |
| H2Oa | 2.7 × 10−8 | 0.20 | Using [CH] = 3.6 × 10−8e | 3.4 × 1020 |
| CCH | 4.4 × 10−8 | 0.15 | Using [CH] = 3.6 × 10−8e | 1.5 × 1021 |
| CHb | 3.6 × 10−8 | 0.21 | Sheffer et al. (2008) | 1.0 × 1021 |
| CHc | 3.6 × 10−8 | 0.21 | Sheffer et al. (2008) | 9.7 × 1020 |
| OHd | 1.0 × 10−7 | 0.1 | Weselak et al. (2010) | 2.5 × 1020 |
Notes. (a) The entry in the last column refers to the ground-statep-H2O line at 1.13 THz and assume an ortho-to-para ratio of three. (b)The entry in the last column refers to the 532 or the 536 GHz transitions of CH. (c) The entry in the last column refers to the 2 THz transitions of CH. (d)The entry in the last column refers to the 2.5 THz transitions of OH. Weselak et al. (2010) present data for five objects only. (e) Sheffer et al. (2008).
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