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Table 3
Column density ratios of key molecules observed toward the low-mass protostar B1-c.
| Species | Observeda | Model 150K | Model 150K | Model 300 K | Model 300 K | Model 600 K | Model 600 K |
|---|---|---|---|---|---|---|---|
| no X-rays | LX = 1029 | no X-rays | LX = 1029 | no X-rays | LX = 1029 erg s-1 | ||
| CO2/H2O | 0.22 | 0.025 | 0.27 | 0.0016 | 0.0025 | 0.0012 | 0.0029 |
| HCN/H2O | 0.08 | 0.024 | 0.0001 | 0.037 | 0.037 | 0.063 | 0.086 |
| C2H2/H2O | 0.05 | <0.0001 | 0.0003 | <0.0001 | 0.0054 | 0.0001 | 0.0069 |
| CH4/H2O | 0.10 | 0.039 | 0.028 | 0.020 | <0.0001 | 0.048 | 0.013 |
| NH3/H2O | 0.04 | 0.05 | 0.0001 | 0.062 | 0.016 | 0.10 | 0.069 |
| C2H2/HCN | 0.64 | 0.0001 | 3.4 | 0.0004 | 0.15 | 0.002 | 0.08 |
| C2H2/CO2 | 0.21 | 0.0001 | 0.001 | 0.008 | 2.2 | 0.10 | 240 |
Notes. aObserved column densities taken from Table H.4 of van Gelder et al. (2024a), using the warm H2O column of 4.4 × 1018 cm 2 as reference. Observational uncertainties in the ratios are about 50%.
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