Table 1
Emission of the diagnostically important collisionally excited lines [N II] λλ 6584, 6548, [O II] λλ 3726, 3729, [O III] λλ 5007, 4959, and [S II] λλ 6716, 6731 relative to thecorresponding Hβ emission for matter-bounded (leaky) H II regions and the surrounding DIG.
| H II regions | DIG | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Teff | Z | fesc,H | [N II] | [O II] | [O III] | [S II] | [N II] | [O II] | [O III] | [S II] |
| (K) | (Z⊙) | (in units of Hβ) | ||||||||
| 30 000 | 0.1 | Picket fence | 0.92 | 2.1 | 0.00 | 0.38 | 0.92 | 2.0 | 0.00 | 0.33 |
| 70% | 0.95 | 2.3 | 0.00 | 0.21 | 0.95 | 2.1 | 0.00 | 0.38 | ||
| 50% | 0.93 | 2.2 | 0.00 | 0.27 | 1.0 | 2.6 | 0.00 | 0.25 | ||
| 30% | 0.92 | 2.1 | 0.00 | 0.31 | 1.0 | 2.4 | 0.00 | 0.35 | ||
| 10% | 0.91 | 2.1 | 0.00 | 0.35 | 1.0 | 2.5 | 0.00 | 0.27 | ||
| 5% | 0.93 | 2.1 | 0.00 | 0.37 | 0.97 | 2.4 | 0.00 | 0.22 | ||
| 0.4 | Picket fence | 1.7 | 2.2 | 0.00 | 0.84 | 1.7 | 2.0 | 0.00 | 0.82 | |
| 70% | 1.5 | 1.8 | 0.01 | 0.41 | 1.8 | 2.3 | 0.00 | 0.88 | ||
| 50% | 1.5 | 1.8 | 0.01 | 0.51 | 1.9 | 2.6 | 0.00 | 0.88 | ||
| 30% | 1.5 | 1.8 | 0.00 | 0.62 | 2.0 | 3.0 | 0.00 | 0.85 | ||
| 10% | 1.6 | 2.1 | 0.00 | 0.75 | 2.2 | 3.5 | 0.00 | 0.71 | ||
| 5% | 1.6 | 2.1 | 0.00 | 0.79 | 2.2 | 3.7 | 0.00 | 0.65 | ||
| 1.0 | Picket fence | 1.7 | 1.1 | 0.00 | 1.1 | 1.7 | 1.1 | 0.00 | 0.72 | |
| 70% | 1.3 | 0.79 | 0.00 | 0.64 | 1.9 | 1.3 | 0.00 | 0.97 | ||
| 50% | 1.3 | 0.77 | 0.00 | 0.73 | 2.0 | 1.5 | 0.00 | 1.0 | ||
| 30% | 1.4 | 0.83 | 0.00 | 0.83 | 2.2 | 1.8 | 0.00 | 1.0 | ||
| 10% | 1.5 | 1.0 | 0.00 | 1.0 | 2.5 | 2.3 | 0.00 | 0.92 | ||
| 5% | 1.6 | 1.1 | 0.00 | 1.1 | 2.3 | 2.2 | 0.00 | 0.77 | ||
| 35 000 | 0.1 | Picket fence | 0.48 | 1.9 | 1.9 | 0.16 | 0.55 | 2.0 | 1.3 | 0.25 |
| 70% | 0.12 | 1.1 | 4.0 | 0.04 | 0.63 | 2.1 | 1.2 | 0.26 | ||
| 50% | 0.19 | 1.4 | 3.3 | 0.06 | 0.71 | 2.2 | 1.1 | 0.27 | ||
| 30% | 0.29 | 1.8 | 2.7 | 0.09 | 0.92 | 2.6 | 0.74 | 0.16 | ||
| 10% | 0.44 | 1.9 | 2.2 | 0.14 | 1.2 | 3.2 | 0.01 | 0.21 | ||
| 5% | 0.40 | 1.9 | 2.0 | 0.15 | 1.2 | 3.4 | 0.01 | 0.19 | ||
| 0.4 | Picket fence | 1.2 | 3.0 | 1.9 | 0.41 | 1.3 | 3.2 | 1.3 | 0.65 | |
| 70% | 0.14 | 1.1 | 4.4 | 0.05 | 1.5 | 3.5 | 1.2 | 0.69 | ||
| 50% | 0.37 | 1.9 | 3.2 | 0.12 | 1.9 | 4.0 | 1.1 | 0.72 | ||
| 30% | 0.60 | 2.4 | 2.7 | 0.19 | 2.4 | 4.6 | 0.70 | 0.71 | ||
| 10% | 1.0 | 2.9 | 2.2 | 0.32 | 3.2 | 6.2 | 0.01 | 0.64 | ||
| 5% | 1.1 | 3.0 | 2.1 | 0.36 | 3.4 | 6.9 | 0.00 | 0.58 | ||
| 1.0 | Picket fence | 1.4 | 2.1 | 0.83 | 0.55 | 1.4 | 1.5 | 0.93 | 0.62 | |
| 70% | 0.19 | 0.66 | 1.6 | 0.06 | 1.6 | 1.8 | 0.71 | 0.68 | ||
| 50% | 0.38 | 1.0 | 1.4 | 0.13 | 1.7 | 2.3 | 0.67 | 0.67 | ||
| 30% | 0.65 | 1.5 | 1.2 | 0.22 | 1.6 | 2.3 | 0.31 | 0.69 | ||
| 10% | 1.1 | 1.8 | 0.94 | 0.38 | 2.5 | 2.9 | 0.00 | 0.48 | ||
| 5% | 1.3 | 2.0 | 0.88 | 0.46 | 1.9 | 2.5 | 0.00 | 0.29 | ||
Notes. The SEDs of the ionizing sources are from Weber et al. (2015) with metallicities of 0.1 Z⊙, 0.4 Z⊙, and 1.0 Z⊙. The H II regions have densities of nH = 10 cm−3 and their outer radii adjusted to allow 5−70% of the ionizing photons to escape. These are used as ionizing fluxes for the DIG (nH = 0.1 cm−3), scaled to 1050 ionizing photons s−1 for easier comparison. For the picket-fence cases, the line ratios listed for the H II regions are from optically thick, radiation-bounded (fesc = 0) models, while for the DIG the unaltered stellar SEDs (corresponding to fesc = 100%) are used as the ionizing fluxes (again scaled to 1050 ionizing photons s−1).
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