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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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