Table 4
Comparison of the shielding of 14N2 and 12CO by H2 + H and dust for a range of extinction, AV, at 10 K and taking N(H) = 5 × 1020 cm-2.
| Shielding due to H2 + H | Shielding due to dust | ||||||
| A V | log N(H2) (cm-2) | 14N2 | 12COa | Interstellar | Protoplanetary | ||
|
|
|||||||
| 0.31 | 0 | 8.916(–1) | 0.9 | 3.318(–1) | 8.290(–1) | ||
| 0.32 | 19 | 8.098(–1) | 8.176(–1) | 3.175(–1) | 8.228(–1) | ||
| 0.44 | 20 | 5.543(–1) | 7.223(–1) | 2.134(–1) | 7.691(–1) | ||
| 1.56 | 21 | 2.759(–1) | 3.260(–1) | 4.023(–3) | 3.916(–1) | ||
| 12.8 | 22 | 1.346(–2) | 1.108(–2) | 0 | 4.585(–4) | ||
| 125.3 | 23 | 2.343(–8) | 3.938(–7) | 0 | 0 | ||
Notes.The unattenuated photodissociation rates of 14N2 and 12CO are 1.65 × 10-10 and 2.59 × 10-10 s-1, respectively.
The CO values are from Visser et al. (2009).
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