Table 6
Summary of column density ratios with respect to methanol predicted by models and derived towards AFGL 4176, Sgr B2(N), Orion KL, and IRAS 16293B.
| X/CH3OH (%) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Sgr B2 | Orion KL | AFGL 4176 | IRAS 16293B (a) | Model | |||||
| (N2) | (N3-5) | F | M | S | |||||
| Hydrocarbons | CH3C2H | – | – | – | 0.7 ± 0.2 | – | – | – | – |
| O-bearing | CH3CHO | – | – | – | 0.3 ± 0.2 | 1.20 | 0.03 | 0.10 | 0.37 |
| C2H5OH | 5.0 | 7.6–10.4 | 0.37–1.98 | 1.4 ± 0.4 | 2.3 | 0.54 | 0.64 | 1.29 | |
| CH3OCH3 | – | – | 3.40–9.26 | 2.4 ± 0.3 | 2.4 | 0.44 | 0.69 | 0.74 | |
| CH3COCH3 | – | – | 0.05–0.15 | 1.0 ± 0.2 | 0.17 | 0.01 | 0.11 | 0.05 | |
| CH3OCHO | 3.0 | 18.9–32.0 | 4.76–22.2 | 3.1 ± 0.6 | 2.6 | 0.84 | 0.41 | 0.08 | |
| (CH2OH)2 | – | – | 0.10–0.42 | 0.5 ± 0.2–0.6 ± 0.1 | 0.5–0.55(b) | 0.03 | 0.01 | 10−4 | |
| N-bearing | CH3CN | 5.78 | 10.6–13.4 | – | 0.62 ± 0.07 | 0.4 | 0.04 | 0.02 | 0.03 |
| NH2CHO | 8.75 | 0.83–1.16(c) | – | 0.18 ± 0.02 | 0.1 | 3.55 | 1.65 | 0.08 | |
| C2H3CN | 1.05 | 0.6–1.25 | – | 0.11 ± 0.02 | 0.007 | 0.1 | 0.06 | 0.15 | |
| C2H5CN | 17.25 | 4.8–8.11 | – | 0.12 ± 0.02 | 0.04 | 0.05 | 0.85 | 0.79 | |
| S-bearing | NS | – | – | – | 0.22 ± 0.02 | – | – | – | – |
| H2CS | – | – | – | 0.78 ± 0.07 | 0.02 | – | – | – | |
| SO2 | – | – | – | 14.7 ± 3.6 | 0.02 | 0.67 | 0.84 | 2.05 | |
| Reference | 1, 2 | 3 | This work | 4, 5, 6, 7, 8, 9 | 10 | ||||
Notes. F = Fast model, M = Medium model, S = Slow model. (a)Listed values are derived at 0.5′′ (one beam) offset from IRAS 16293B. (b)Derived at 0.25′′ (half beam) offset from IRAS 16293B. (c)Excluding the upper limit of ≤0.56% derived for N4.
References.(1) Belloche et al. (2016); (2) Bonfand et al. (2017); (3) Tercero et al. (2018); (4) Coutens et al. (2016); (5) Jørgensen et al. (2016); (6) Lykke et al. (2017); (7) Calcutt et al. (2018); (8) Drozdovskaya et al. (2018); (9) Jørgensen et al. (2018); (10) Garrod (2013).
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