Table 3
Fractional abundances, X, of the observed species in H-MM1 and Oph D from minimum chi-squared estimation, together with the NHD2/NH2D ratios and the o/p ratios of NH2D and NHD2 derived from these.
| H-MM1 | |||||
|---|---|---|---|---|---|
| (a)(†) | (b)(†) | (c)(†) | |||
| (×10−9) | Maximum (×10−9) | Average (×10−9) | Maximum (×10−9) | Average (×10−9) | |
| X(oNH2D)(†) | 4.520 ± 0.028 | 6.617 ± 0.042 | 2.581 ± 0.017 | 6.720 ± 0.043 | 2.471 ± 0.016 |
| X(pNH2D) | 1.469 ± 0.021 | 2.374 ± 0.032 | 0.926 ± 0.013 | 2.426 ± 0.035 | 0.892 ± 0.016 |
| X(oNHD2) | 0.925 ± 0.014 | 1.477 ± 0.022 | 0.576 ± 0.009 | 1.491 ± 0.023 | 0.548 ± 0.008 |
| X(pNHD2) | 0.455 ± 0.012 | 0.734 ± 0.018 | 0.286 ± 0.007 | 0.745 ± 0.019 | 0.274 ± 0.007 |
| X(NH2D) | 5.989 ± 0.035 | 8.991 ± 0.053 | 3.507 ± 0.021 | 9.146 ± 0.055 | 3.363 ± 0.022 |
| X(NHD2) | 1.380 ± 0.018 | 2.211 ± 0.029 | 0.862 ± 0.011 | 2.236 ± 0.030 | 0.822 ± 0.011 |
| NHD2/NH2D | 0.230 ± 0.003 | 0.246 ± 0.004 | 0.246 ± 0.003 | 0.244 ± 0.004 | 0.244 ± 0.007 |
| o/pNH2D | 3.077 ± 0.048 | 2.787 ± 0.042 | 2.788 ± 0.042 | 2.770 ± 0.043 | 2.770 ± 0.052 |
| o/pNHD2 | 2.033 ± 0.061 | 2.011 ± 0.058 | 2.012 ± 0.058 | 2.002 ± 0.060 | 2.001 ± 0.083 |
| Oph D | |||||
|---|---|---|---|---|---|
| (a) | (b) | (c) | |||
| (×10−9) | Maximum (×10−9) | Average (×10−9) | Maximum (×10−9) | Average (×10−9) | |
| X(oNH2D)(‡) | 4.640 ± 0.045 | 5.345 ± 0.052 | 3.170 ± 0.031 | 5.535 ± 0.052 | 3.113 ± 0.029 |
| X(pNH2D) | 1.469 ± 0.026 | 1.649 ± 0.030 | 0.978 ± 0.018 | 1.710 ± 0.032 | 0.962 ± 0.018 |
| X(oNHD2) | 1.122 ± 0.019 | 1.271 ± 0.022 | 0.754 ± 0.013 | 1.434 ± 0.026 | 0.806 ± 0.015 |
| X(pNHD2) | 0.502 ± 0.015 | 0.580 ± 0.018 | 0.344 ± 0.011 | 0.651 ± 0.021 | 0.366 ± 0.012 |
| X(NH2D) | 6.109 ± 0.052 | 6.994 ± 0.061 | 4.148 ± 0.036 | 7.245 ± 0.061 | 4.075 ± 0.034 |
| X(NHD2) | 1.624 ± 0.025 | 1.851 ± 0.028 | 1.098 ± 0.017 | 2.085 ± 0.034 | 1.173 ± 0.019 |
| NHD2/NH2D | 0.266 ± 0.005 | 0.265 ± 0.005 | 0.265 ± 0.005 | 0.288 ± 0.005 | 0.288 ± 0.005 |
| o/pNH2D | 3.159 ± 0.064 | 3.241 ± 0.068 | 3.242 ± 0.067 | 3.237 ± 0.067 | 3.237 ± 0.068 |
| o/pNHD2 | 2.235 ± 0.077 | 2.191 ± 0.076 | 2.191 ± 0.078 | 2.201 ± 0.081 | 2.203 ± 0.120 |
Notes. (†)The letters indicate three different assumptions about the abundance distributions: (a) X is constant throughout the core; (b) X decreases in the densest parts with n(H2) > 2 × 105 cm−3, following the power law n−1; (c) X increases proportional to n(H2) at densities below 5 × 104 cm−3, and decreases again as in model (b) above 2 × 105 cm−3. For models including depletion, ‘maximum’ means the undepleted fractional abundance and ‘average’ means the column density ratio N(mol)/N(H2) through the density peak of the core. (‡)The X values are given in units of 10−9.
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