Table 1
Strength of the radiation field G0 (Habing 1968), and the [20/30] continuum flux ratio for the regions in Fig. 4.
| Region | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Location | PDR | H ii | H ii | H ii | H ii | H ii | DW |
|
|
|||||||
| log (G0) | 2.0 | 2.2 | 2.3 | 2.5 | 2.9 | 3.3 | 4.2 |
| [20/30] | 0.28 | 0.20 | 0.21 | 0.19 | 0.22 | 0.21 | 0.33 |
Notes. Region 1 is located partly inside the Horsehead photo-dissociation region (PDR), whereas regions 2–7 are located inside the H ii region. Region 7 is projected on top of the dust wave surrounding σ Ori AB. The [20/30] ratio is insensitive to the increase of G0 inside the H ii region, except in region 7, where the dust reaches thermal equilibrium (see text).
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