Table 4
Averaged sizes in nanometres,⟨a⟩, and densities, ndust/nH, for the DHGL populations.
| Dust type | PAH | SamC | LamC | aSil |
|
|
||||
| ⟨a⟩a | 0.6 | 2 | 9 | 7 |
| ndust/nH | 5.1 × 10-7 | 2.6 × 10-9 | 2.0 × 10-11 | 2.4 × 10-10 |
| PAH | 804 | 563 | 478 | 485 |
| SamC | 563 | 299 | 200 | 209 |
| LamC | 478 | 200 | 89 | 99 |
| aSil | 485 | 209 | 99 | 110 |
| 10% | 463 | 182 | 68 | 79 |
Notes. Lines 3 to 6 (PAH to aSil) of the table give the critical speed between the species in m/s (see Eq. (2)). The last line gives vcrit for collisions with an aggregate containing 10% of voids (⟨a⟩ ~ 20 nm).
These sizes correspond to the average size over the size distribution in terms of grain number. In terms of mass, the average sizes are of 0.7 and 3.5 nm for the PAHs and the SamC, respectively, the size distributions of which are log-normals. For the LamC and the aSil grains, for which the size distributions decrease as power-laws, they are 221 and 255 nm, respectively.
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