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Table 3
Number density of the grains (in bold) and coagulation time-scale for two grains in a molecular cloud of density nH = 4 × 103 cm-3 with a relative velocity of 0.1 km s-1 (Draine 2004).
| Type of coagulation | Coagulation time-scale [yr] | ng [cm-3] |
|
|
||
| VSG on VSG | 1.4 × 105 | 1.52 × 10-5 |
| VSG on BG | 1.6 × 103 | 1.52 × 10-5 |
| BG (car) on BG | 1.1 × 106 | 6.17 × 10-9 |
| BG (sil) on BG | 4.3 × 105 | 1.60 × 10-8 |
Notes. See details in Stepnik et al. (2003); “car” indicates amorphous carbon and “sil” indicates astronomical silicate.
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