Table 3
Best-fit input parameters of the Meudon PDR code for the corrected intensities.
| Parameters | ISMDB | Ads/Des |
|---|---|---|
| model (a) | model (b) | |
| θ (°) | 60 | 60 |
 |
20 | 20 |
| G0 (Mathis unit) | 5 × 104 | 3.1 × 104 |
| Pth (K cm−3) | 1 × 108 | 2.8 × 108 |
| Cosmic rays (s−1 per H2) | 1 × 10−16 | 5 × 10−16 |
| Rv | 3.1 | 5.62 |
| NH/E(B–V) (cm−2) | 5.8 × 1021 | 1.05 × 1022 |
| Mass grains/Mass gas | 0.01 | 0.01 |
| Grain size distribution | ∝ α−3.5 | ∝ α−3.5 |
| Min grain radius (cm) | 1 × 10−7 | 3 × 10−7 |
| Max grain radius (cm) | 3 × 10−5 | 3 × 10−5 |
| H2O binding energy (K) | 5600 | |
| H2O photodesorption yield (c) | 2 × 10−3 | |
| H2 internal energy used | No | Yes |
Notes. (a) Pure gas-phase chemistry model with standard ISMDB inputs. (b)Adsorption and desorption optimized model with Joblin et al. (2018) inputs and H2 internal energy. No additional scaling factor was applied to correct for a more edge-on geometry. (c) The water photodesorption yield is in units of molecules per incident photon.
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