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Table 3.
Parameters we used to compute the nebular continuum and line emission.
| Parameters | Effective HII region | Effective PDR region |
|---|---|---|
| Single stellar population | BC03 SSP library (Bruzual & Charlot 2003) | |
| Initial mass function | 0.1–100 M⊙ (Chabrier 2003) | |
| Star formation history | Constant SFR | |
| Age | 10 Myr | |
| Star metallicity Zstar | Related to the gas metallicity, see Table 1 | |
| Ionization parameter U | 39 values, from 10−4 to 10−1, 0.1 dex step | |
| Wavelength range | 9.1 nm to 160 μm | 91.2 nm to 160 μm |
| Cosmic-rays | Not included | ζp = 2 × 10−16 s−1 |
| Cosmic background radiation | Not included | |
| Hydrogen density nH | 3 values: 10, 100 and 1000 cm−3 | |
| Initial abundances | See Sect. 2.2.3 and Table 2 | |
| Gas metallicity Zgas | 26 values, from 0.0001 to 0.05, see Table 1 | |
| Dus extinction | No grain | ISM grains |
| Dust attenuation | Screen, MW law | |
| Stopping criterion | H+/H ≤ 10−3 | AV ≥ 10 |
Notes. Only the ζO, U, and nH parameters were varied.
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