Table 1
PAH band ratios calculated for different stellar radiation fields and cut-off wavelengths of the PAH absorption cross section, λcut.
| (1) | (2) | (3) | (4) | (5) | (6) |
| PAH | PAH | ||||
| Star | λcut | tabs |
|
ratio | ratio |
| K | μm | s | eV | 6.2/11.3 | 7.7/11.3 |
|
|
|||||
| 5000 | 0.6 | 140 | 2.6 | 0.19 | 0.60 |
| 20 000 | 0.6 | 90 | 5.3 | 0.41 | 0.92 |
|
|
|||||
| 5000 | 1.8 | 25 | 1.5 | 0.22 | 0.66 |
| 20 000 | 1.8 | 75 | 4.7 | 0.34 | 0.83 |
Notes. (1) Blackbody temperature (hν < 13.6 eV). (2) Cut-off wavelength in the PAH absorption cross section. (3) Average time between 2 photons absorptions (Eq. (4), SK10). (4) Mean photon energy absorbed by a PAH (Eq. (5), SK10). (5) Flux ratio at 6.2 μm and 11.3 μm. (6) Flux ratio at 7.7 μm and 11.3 μm.
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