Table A.1
Full initial conditions (abundance of each species vs. total composition).
| Species | Initial conditions 1 | Initial conditions 2 | Initial conditions 3 | Initial conditions 4 | Initial conditions 5 |
|---|---|---|---|---|---|
| H (gas) | 3.525 × 10−5 | 2.560 × 10−5 | 0 | 1.880 × 10−5 | 2.270 × 10−5 |
| C (gas) | 1.375 × 10−4 | 1.367 × 10−4 | 1.150 × 10−4 | 1.357 × 10−4 | 1.3875 × 10−4 |
| N (gas) | 7.475 × 10−5 | 7.480 × 10−5 | 7.250 × 10−5 | 7.350 × 10−5 | 7.350 × 10−5 |
| O (gas) | 3.118 × 10−4 | 3.048 × 10−4 | 2.375 × 10−4 | 3.0385 × 10−4 | 3.029 × 10−4 |
| H2O (ice) | 5.0 × 10−6 | 1.0 × 10−5 | 5.0 × 10−5 | 1.0 × 10−5 | 1.0 × 10−5 |
| CO (ice) | 5.0 × 10−7 | 5.0 × 10−7 | 5.0 × 10−6 | 8.0 × 10−7 | 1.7 × 10−6 |
| CO2 (ice) | 5.0 × 10−7 | 1.5 × 10−6 | 5.0 × 10−6 | 1.3 × 10−6 | 2.3 × 10−6 |
| NH3 (ice) | 2.5 × 10−7 | 2.0 × 10−7 | 2.5 × 10−6 | 1.5 × 10−6 | 1.5 × 10−6 |
| CH3OH (ice) | 2.5 × 10−7 | 5.0 × 10−7 | 2.5 × 10−6 | 1.0 × 10−6 | 4.0 × 10−7 |
| HCOOH (ice) | 5.0 × 10−7 | 5.0 × 10−7 | 5.0 × 10−6 | 7.0 × 10−7 | 1.0 × 10−7 |
| CH4 (ice) | 2.5 × 10−7 | 1.0 × 10−7 | 2.5 × 10−6 | 1.5 × 10−7 | 1.5 × 10−7 |
| H2CO (ice) | 5.0 × 10−7 | 2.0 × 10−7 | 5.0 × 10−6 | 3.5 × 10−7 | 2.0 × 10−7 |
Notes. It is assumed that all available atomic hydrogen is in the form of H2. IC1 is based on a lower limit of the water abundance of 10−5 vs. H2 and IC 3 is based on the upper limit of water abundance of 10−4 vs. H2. For IC 2, 4, and 5 the water ice abundance is set at 5 × 10−5 vs. H2 and the other ice abundances are calculated from percentages vs. water from observations of ice in star-forming regions (Gibb et al. 2004). IC2 is based on AFGL 2136, IC4 on W33A, and IC5 on NGC7538 IRS9.
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