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Table 2
Physical parameters of the chemical models.
| Physical parameter | Static |
|---|---|
| Gas density nH (cm−3) | x* |
| Extinction AV (mag) | 10 |
| Dust temperature Td (K) | 10 |
| Gas temperature Tg (K) | 10 |
| Cosmic-ray ionization ratio ζ (s−1) | 1.3 × 10−17 |
| Radiation field χ (χ0)a | 1 |
| Dust-to-gas mass ratio Rd2g | 0.01 |
| Dust radius rd (cm) | 10−5 |
| Dust mass density ρd (g cm−3) | 3.0 |
| Diffuse-to-binding energy ratio | 0.5 |
| Site density Sd (sites cm−2) | 1.5 × 1015 |
Notes. * x is fixed density for the static models (see Section 3.4). a Radiation field in units of the Far ultraviolet interstellar radiation field χ0 of Draine (1978).
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