Table 2.
Input parameters and abundances for the model grids.
| Fixed parameters | |
|---|---|
| Radiation field | Starburst99 continuous SF of 10 Myr, |
| ...Geneva stellar track, scaled to Z, | |
| ...Kroupa IMF, | |
| ...log(L/L⊙) = 9 | |
| Blackbody T = 5 × 106 K (X-ray), | |
| ...log(L/L⊙) = 5.2 | |
| Cosmic rays background 0.5 log | |
| CMB | |
| Table ISM | |
| vturb | 1.5 km s−1 |
| D/G mass ratio | (5 × 10−3)×Z |
| Metal, PAH abund. | Set to values below |
| Density law | nH, PDR = nH, HII × (1 + N(H)/[1021 cm−2]) |
| Stopping criterion | AV= 5 mag |
| Varied parameters and grid values | |
| log nH | [0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5] cm−3 |
| log U | [−4, −3.5, −3, −2.5, −2, −1.5, −1, −0.5] |
| covPDR | [0, 0.2, 0.4, 0.6, 0.8, 1] |
| Zbin | [0.05, 0.10, 0.25, 0.50, 1.00] |
| …log O/H | [−4.80, −4.50, −4.10, −3.80, −3.50] |
| …log C/O | [−0.99, −0.87, −0.69, −0.56, −0.44] |
| …log N/O | [−1.60, −1.60, −1.60, −1.30, −1.00] |
| …log Ne/O | [−0.82, −0.79, −0.75, −0.73, −0.70] |
| …log S/O | [−1.70, −1.71, −1.72, −1.73, −1.74] |
| …log Si/O | [−2.00, −2.00, −2.00, −2.00, −2.00] |
| …log Ar/O | [−2.43, −2.42, −2.41, −2.39, −2.38] |
| …log Fe/O | [−1.37, −1.55, −1.79, −1.98, −2.16] |
| …log Cl/O | [−3.50, −3.47, −3.42, −3.38, −3.35] |
| …log PAH/H | [−9.51, −8.82, −7.90, −7.22, −6.52] |
Notes. Other metals (not shown here) have abundances that are based on the ISM abundance pattern, and are then scaled to the metallicity (Zbin) of the grid. We note that the luminosity of the different radiation field components are the reference values used for the model computation, but models are scaled afterwards to the observed luminosities of each source.
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