Table 4
Parameters in the spinning dust models for Perseus and ρ Ophiuchi.
| Gas state | Molecular | Atomic | Ionised |
|
|
|||
| Perseus | |||
| NH [1021 cm-2] | 11.7 | 1.3 | 0.4 |
| nH [cm-3] | 250 | 30 | 1 |
| z [pc] | 15.1 | 14.0 | ... |
| G0 | 1 | 2 | ... |
| T [K] | 40 | 100 | 8 × 103 |
| xH [ppm] | 112 | 410 | 106 |
| xC [ppm] | <1 | 100 | ... |
| y | 1 | 0.1 | ... |
| a0 [nm] | 0.58 | 0.53 | ... |
| bC [ppm] | 68 | 68 | ... |
| β | ... | 1.65 | ... |
| Td [K] | ... | 18.5 | ... |
| τ250 | ... | 9.4 × 10-4 | ... |
|
|
|||
| ρ Ophiuchi | |||
| NH [1021 cm-2] | 18.2 | 0.4 | 0.4 |
| nH [cm-3] | 2 × 104 | 200 | 0.5 |
| z [pc] | 0.3 | 0.6 | ... |
| G0 | 0.4 | 400 | ... |
| T [K] | 20 | 103 | 8 × 103 |
| xH [ppm] | 9.2 | 373 | 106 |
| xC [ppm] | < 1 | 100 | ... |
| y | 1 | 0.1 | ... |
| a0 [nm] | 0.60 | 0.38 | ... |
| bC [ppm] | 65 | 50 | ... |
| β | ... | 1.75 | ... |
| Td [K] | ... | 20.7 | ... |
| τ 250 | ... | 3.2 × 10-3 | ... |
Notes. xH and xC are the abundances of H+ and C+; y is the molecular fraction 2nH2/nH; a0 is the centroid of the PAH size distribution; bC is the PAH abundance of carbon in PAHs; and z is the depth of the emission region along the line of sight. The radiation field is that of Mathis et al. (1983) multiplied by the factor G0. The ionised gas accounts for the free-free emission but does not contribute to the spinning dust emission.
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