Table 2
at λ = 250 μm, the dust temperature and the increase in the dust opacity (indicated as τnorm) at λ = 250 μm assuming the ISRF for the diffuse ISM.
| Aggregate |
|
T [K] | τ norm | |
| at 250 μm | ||||
|
|
||||
| 1BG(car) | – | 18.1 | – | |
| 1BG(sil) | – | 16.3 | – | |
| 1VSG | – | ~150 | – | |
|
|
||||
| 1BG(car)+VSGs | 1.16 | 17.5 | 1.79 | |
| 1BG(sil)+VSGs | 1.55 | 16.2 | 1.64 | |
|
|
||||
| 4BGs(car) | 1.49 | 16.5 | 1.63 | |
| 4BGs(sil) | 1.38 | 14.0 | 2.16 | |
|
|
||||
| 4BGs(mix) | 1.72 | 14.8 | ~2.0 | |
|
|
||||
| 4BGs(car)+VSGs | 1.62 | 16.3 | 2.44 | |
| 4BGs(sil)+VSGs | 2.36 | 14.8 | 2.56 | |
|
|
||||
| 4BGs(mix)+VSGs | 2.07 | 15.2 | ~2.6 | |
|
|
||||
| 16BGs(sil) | 2.21 | 13.5 | ||
|
|
||||
| 16BGs(mix)+VSGs | 2.11 | 14.9 | ~2.7 | |
Notes. For aggregates consisting of BGs and VSGs we consider 1000 VSGs per BG (40% of the volume of a BG). Single VSGs are stochastically heated and the maximal temperature is shown; “car” indicates amorphous carbon and “sil” indicates astronomical silicate, “mix” indicate aggregates with 4 BGs, where 1 BG is of amorphous carbon and 3 BGs of astronomical silicate, and of 16 BGs, where 4 BGs are of amorphous carbon and 12 BGs of astronomical silicate. The values for τnorm for “mixed” aggregates are calculated considering an average temperature of 17.2 K for the single separated grains.
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