Table 2.
Models discussed in this paper, along with descriptions of the chemical network and the cooling species included in each case.
| Network | Description | Cooling species included |
|---|---|---|
| A1 | Full gas-phase and grain–surface reaction networks described in Sect. 2.2, but considering only species with up to five atoms, ~43 500 (42 000 + 1510) reactions in total | 12CO, 13CO, C, C+, O, oH2O, pH2O, NO, HCN, HNC |
| A1alt | As A1, but with some coolants removed | 12CO, 13CO, C, C+, O, oH2O, pH2O |
| B1 | Simple chemical network based on the one used by Nelson & Langer (1999; see Appendix A), no surface chemistry except for the formation of H2 | 12CO, 13CO, C, C+, O, H2Oa |
| B2 | As B1, but with more surface chemistry (see Appendix A) | 12CO, 13CO, C, C+, O, H2Oa |
| B2alt | As B2, but including photodesorptionb of grain–surface CO and H2O | 12CO, 13CO, C, C+, O, H2Oa |
Notes.
We assume that the H2O o/p ratio is unity, and use the data available in LAMDA (Schöier et al. 2005) for oH2O and pH2O.
Photodesorption is not included in the other models. The assumed photodesorption yields are 2.7 × 10−3 for CO (Öberg et al. 2009b) and 1.0 × 10−3 for H2O (Öberg et al. 2009a).
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