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Table 4
Best-fit (at best-fit time of 2.99 × 105 yr) ice composition against observations in MYSOs, LYSOs, and toward BG stars.
| Model/Observations | H2O | CO | CO2 | CH3OH | NH3 | CH4 | H2CO | OCS |
|---|---|---|---|---|---|---|---|---|
| Best-fit model | 100 | 10.74 | 44.04 | 10.02 | 1.52 | 11.70 | 6.41 | 0.04 |
| Nautilus (with μs = 0.4) | 100 | 13.76 | 54.77 | 12.56 | 1.10 | 10.10 | 7.63 | 0.02 |
| BG stars | 100 | 20−43 | 18−39 | 6−10 | <7 | <3 | nd | < 0.22 |
| MYSOs | 100 | 4−15 | 12−25 | 5−23 | ∼7 | 1−3 | ∼2−7 | 0.03−0.16 |
| LYSOs | 100 | 12−35 | 23−37 | 5−12 | 4−8 | 3−6 | ∼6 | ≤1.6 |
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